For the commonly used pressure vessel material Q345R, the theoretical formulas of stress concentration factor (SCF) and fatigue life of welded joints were derived. A finite element analysis model was established to systematically study the theoretical SCF and fatigue life of the joint. The results show that the theoretical SCF increases by 45% with the increase of reinforcement height and decreases by 9.9% with the increase of fillet radius. In addition, the weld width and wire material have no effect on SCF. The fatigue tests of three typical welded specimens were carried out. The experimental results were basically consistent with the finite element analysis results, which proved the reliability of the analysis model and provided theoretical guidance for the actual detection and evaluation.
{"title":"Study on the influence of the shape and properties of Q345R welded joints on stress concentration and fatigue life","authors":"Rui Ma, Yu Zhang, Jun-min Zhao, C. Zhang","doi":"10.1051/metal/2023021","DOIUrl":"https://doi.org/10.1051/metal/2023021","url":null,"abstract":"For the commonly used pressure vessel material Q345R, the theoretical formulas of stress concentration factor (SCF) and fatigue life of welded joints were derived. A finite element analysis model was established to systematically study the theoretical SCF and fatigue life of the joint. The results show that the theoretical SCF increases by 45% with the increase of reinforcement height and decreases by 9.9% with the increase of fillet radius. In addition, the weld width and wire material have no effect on SCF. The fatigue tests of three typical welded specimens were carried out. The experimental results were basically consistent with the finite element analysis results, which proved the reliability of the analysis model and provided theoretical guidance for the actual detection and evaluation.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126350527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Xiaoxuan Deng, Haibo Li, C. Ji, Bin Chen, Haichen Zhou, Congcong Zhang
In the current study, the three-dimensional morphology of a typical point-like defect in deep drawing IF steel sheets was characterized by step machining method, and the corresponding casting parameters and stopper tip clogs were also analyzed. The results show that the defect contains two parts: single alumina refractory grain and alumina clusters. Furthermore, the actual size of inclusion in the defect using the 3D characterization was determined to about 1 mm, much larger than that only from surface evaluation (~ 0.1 mm). Based on clog analysis and tracing casting parameters, the formation mechanism of defect during the whole production process was proposed. The defect may originates from the occasional dislodging of stopper tip deposits in the tundish level rising period of ladle exchange process where the entrapped FeO rich ladle slag into the tundish and temperature drop worsen the clogging. Therefore, elimination of ladle slag entrapment and stabilization of steel temperature in the tundish during ladle change procedures help to eliminate the point-like defect of steel sheets for deep drawing purpose.
{"title":"Formation mechanism of point-like defect in IF steel sheet during deep drawing process","authors":"Xiaoxuan Deng, Haibo Li, C. Ji, Bin Chen, Haichen Zhou, Congcong Zhang","doi":"10.1051/metal/2022052","DOIUrl":"https://doi.org/10.1051/metal/2022052","url":null,"abstract":"In the current study, the three-dimensional morphology of a typical point-like defect in deep drawing IF steel sheets was characterized by step machining method, and the corresponding casting parameters and stopper tip clogs were also analyzed. The results show that the defect contains two parts: single alumina refractory grain and alumina clusters. Furthermore, the actual size of inclusion in the defect using the 3D characterization was determined to about 1 mm, much larger than that only from surface evaluation (~ 0.1 mm). Based on clog analysis and tracing casting parameters, the formation mechanism of defect during the whole production process was proposed. The defect may originates from the occasional dislodging of stopper tip deposits in the tundish level rising period of ladle exchange process where the entrapped FeO rich ladle slag into the tundish and temperature drop worsen the clogging. Therefore, elimination of ladle slag entrapment and stabilization of steel temperature in the tundish during ladle change procedures help to eliminate the point-like defect of steel sheets for deep drawing purpose.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126342392","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The evolution of oxide and sulfide inclusions during the refining, continuous casting, and rolling of an aluminum-killed free-cutting steel was investigated. The composition, morphology, size, number density, and area fraction of inclusions in the steel were detected, and showed a remarkable variation during each production step of the steel. After the addition of ferroalloys into the molten steel during LF process, the content of CaO in oxide inclusions increased from 1.32 wt.% to 4.35 wt.% and that of CaS increased from 3.12 wt.% to 13.86 wt.%. During vacuum degassing process, the removal fraction of inclusions from the steel was approximately 40.9% and 52.9% for the number density and area fraction, respectively. With a proper amount of calcium addition, the elongation of MnS inclusions in the steel after rolling was efficiently decreased, which was predicted using thermodynamics calculation in the current paper.
{"title":"Evolution of oxide and sulfide inclusions during the production of an Al-killed free-cutting steel","authors":"Hong-Yao Wei, Xiaoyong Gao, Q. Ren, Lifeng Zhang","doi":"10.1051/metal/2022093","DOIUrl":"https://doi.org/10.1051/metal/2022093","url":null,"abstract":"The evolution of oxide and sulfide inclusions during the refining, continuous casting, and rolling of an aluminum-killed free-cutting steel was investigated. The composition, morphology, size, number density, and area fraction of inclusions in the steel were detected, and showed a remarkable variation during each production step of the steel. After the addition of ferroalloys into the molten steel during LF process, the content of CaO in oxide inclusions increased from 1.32 wt.% to 4.35 wt.% and that of CaS increased from 3.12 wt.% to 13.86 wt.%. During vacuum degassing process, the removal fraction of inclusions from the steel was approximately 40.9% and 52.9% for the number density and area fraction, respectively. With a proper amount of calcium addition, the elongation of MnS inclusions in the steel after rolling was efficiently decreased, which was predicted using thermodynamics calculation in the current paper.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132710761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
In this paper, in order to clarify the mechanism of improving the transverse corner crack of peritectic steel slab with Mg treatment, the inclusions and microstructure characteristics at the slab corner of Al deoxidized (S-Al), (Al+Ca) deoxidized (S-Ca) and (Al+Mg) deoxidized (S-Mg) peritectic steels were studied. The inclusions in S-Al sample are mainly Al2O3, Al2O3 · MnS and MnS inclusions. The S-Ca sample mainly contains Al2O3 inclusions and their complex inclusions. In the S-Mg sample, the number of Mg containing inclusions increase sharply. The S-Mg sample has the smallest average size of inclusions and the largest number of inclusions with the size smaller than 1 µm. The brittle structures are dominant in S-Al sample, which basically disappear in S-Ca sample and S-Mg sample. Mg treatment refines the size of grains at the slab corner, reduces the size of the proeutectoid ferrite films, and restrains the crack propagation along the grain boundary. More IAF microstructures are formed in S-Mg sample. IAFs take MgO · Al2O3 · MnS, MgO · Al2O3 · TiN · MnS and other complex inclusions as the nucleation cores, which diverge and grow outward from the inclusions. Thus, IAFs form a fine crack resistant microstructure, improving the microstructure at the slab corner to prevent the occurrence of transverse corner cracks.
{"title":"Mechanism of improving transverse corner cracks of peritectic steel slab based on control of inclusions and microstructures with magnesium treatment","authors":"Wenjing Cai, Jian Yang, Liqin Deng, Kanglin Zuo, Xufeng Wu","doi":"10.1051/metal/2022081","DOIUrl":"https://doi.org/10.1051/metal/2022081","url":null,"abstract":"In this paper, in order to clarify the mechanism of improving the transverse corner crack of peritectic steel slab with Mg treatment, the inclusions and microstructure characteristics at the slab corner of Al deoxidized (S-Al), (Al+Ca) deoxidized (S-Ca) and (Al+Mg) deoxidized (S-Mg) peritectic steels were studied. The inclusions in S-Al sample are mainly Al2O3, Al2O3 · MnS and MnS inclusions. The S-Ca sample mainly contains Al2O3 inclusions and their complex inclusions. In the S-Mg sample, the number of Mg containing inclusions increase sharply. The S-Mg sample has the smallest average size of inclusions and the largest number of inclusions with the size smaller than 1 µm. The brittle structures are dominant in S-Al sample, which basically disappear in S-Ca sample and S-Mg sample. Mg treatment refines the size of grains at the slab corner, reduces the size of the proeutectoid ferrite films, and restrains the crack propagation along the grain boundary. More IAF microstructures are formed in S-Mg sample. IAFs take MgO · Al2O3 · MnS, MgO · Al2O3 · TiN · MnS and other complex inclusions as the nucleation cores, which diverge and grow outward from the inclusions. Thus, IAFs form a fine crack resistant microstructure, improving the microstructure at the slab corner to prevent the occurrence of transverse corner cracks.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"304 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133626898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Tianhao Li, Cui Guimei, Xiaoli Li, Donghao Lv, Yong Zhang
To address the difficulty of controlling the dynamic stability of the system after time-varying delay of the plate thickness detection at the final stand of the hot strip finishing mill. Firstly, a T-S fuzzy model based on rolling force and thickness state is established for the final stand of the hot strip finishing mill, and the maximum time delay for plate thickness detection is divided into several time delay intervals to establish a linear constant state space model of the time delay subintervals. Secondly, a distributed state feedback controller satisfying sufficient conditions for stability is solved by using the parallel distribution compensation (PDC) principle combined with Lyapunov stability theory and linear matrix inequality (LMI) methods. Simulation comparisons with current M-AGC and Smith prediction M-AGC system (Smith-AGC) show that our method can effectively reduce overshoot and oscillations in the dynamic response of the exit plate thickness when the operating conditions change and the system time delay parameters are mismatched, so that the system has better stability and dynamic performance.
{"title":"Research on high performance control strategy of slab thickness based on T-S fuzzy control","authors":"Tianhao Li, Cui Guimei, Xiaoli Li, Donghao Lv, Yong Zhang","doi":"10.1051/metal/2022104","DOIUrl":"https://doi.org/10.1051/metal/2022104","url":null,"abstract":"To address the difficulty of controlling the dynamic stability of the system after time-varying delay of the plate thickness detection at the final stand of the hot strip finishing mill. Firstly, a T-S fuzzy model based on rolling force and thickness state is established for the final stand of the hot strip finishing mill, and the maximum time delay for plate thickness detection is divided into several time delay intervals to establish a linear constant state space model of the time delay subintervals. Secondly, a distributed state feedback controller satisfying sufficient conditions for stability is solved by using the parallel distribution compensation (PDC) principle combined with Lyapunov stability theory and linear matrix inequality (LMI) methods. Simulation comparisons with current M-AGC and Smith prediction M-AGC system (Smith-AGC) show that our method can effectively reduce overshoot and oscillations in the dynamic response of the exit plate thickness when the operating conditions change and the system time delay parameters are mismatched, so that the system has better stability and dynamic performance.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115876580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
N.M. Mirkayev, V. Shevko, D. Aitkulov, A. Badikova
The article examines the results of studying the possibility of obtaining ferrosilicon from tripoli. The studies included the thermodynamic modeling using the HSC-6.0 software package, based on the minimum Gibbs energy principle, and electric melting of tripoli in an arc single-phase electric furnace. The effect of temperature and the amount of carbon on the extraction degree of silicon into alloys and the silicon concentration in these alloys were determined. It was found that the interaction products of tripoli with carbon and iron under equilibrium conditions are mainly FeSi2, Fe3Si, FeSi, Fe5Si3, SiC, SiO(g), CaSiO2, MgSiO3, Al, Si, CO; the silicon extraction degree of 70–77% and its concentration in the alloy of 44.9–47.7% were achieved in the temperature range of 1830–2000 °C in the presence of 34–38% of carbon and 29% of iron; in the temperature range of 1700–1900 °C, the extraction degree of silicon into the alloy was 50–77.1%, and the concentration of silicon in the alloy at 1900 °C was 45–45.85%. During the electric melting of tripoli together with coke and steel shavings, depending on the composition of the charge, FS25 and FS65 ferrosilicon was formed.
{"title":"Thermodynamic and experimental substantiation for obtaining ferrosilicon from tripoli","authors":"N.M. Mirkayev, V. Shevko, D. Aitkulov, A. Badikova","doi":"10.1051/metal/2023003","DOIUrl":"https://doi.org/10.1051/metal/2023003","url":null,"abstract":"The article examines the results of studying the possibility of obtaining ferrosilicon from tripoli. The studies included the thermodynamic modeling using the HSC-6.0 software package, based on the minimum Gibbs energy principle, and electric melting of tripoli in an arc single-phase electric furnace. The effect of temperature and the amount of carbon on the extraction degree of silicon into alloys and the silicon concentration in these alloys were determined. It was found that the interaction products of tripoli with carbon and iron under equilibrium conditions are mainly FeSi2, Fe3Si, FeSi, Fe5Si3, SiC, SiO(g), CaSiO2, MgSiO3, Al, Si, CO; the silicon extraction degree of 70–77% and its concentration in the alloy of 44.9–47.7% were achieved in the temperature range of 1830–2000 °C in the presence of 34–38% of carbon and 29% of iron; in the temperature range of 1700–1900 °C, the extraction degree of silicon into the alloy was 50–77.1%, and the concentration of silicon in the alloy at 1900 °C was 45–45.85%. During the electric melting of tripoli together with coke and steel shavings, depending on the composition of the charge, FS25 and FS65 ferrosilicon was formed.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134555732","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
An attempt is made to investigate mechanical-microstructural-magnetic properties on the welded Cold Rolled Non-Oriented Electrical steel (CRNGO) sheets. Single 0.5 mm thin sheets susceptible to Tungsten Inert gas (TIG) welding current are stacked and edge welded using a range of welding current from 30 A to 110 A. The influence of weld with varying current is analyzed through various testing for joint performance, micro-hardness, Residual stress, weld seam characterization, Grain size variation and Magnetic property evaluation of post-welded samples. The results showed the variations of micro-hardness varies by 33 HV and 42 HV at the Heat affected zone (HAZ) and Fusion zone (FZ), respectively. The relative residual stress ranged from 26.85 MPa to 127.6 MPa, weld strength ratio is about 42.9%, depth to width ratio varies from 0.446 to 0.527. The ferritic and largest fine grains size of 79.7 μm is transformed to coarse 282 μm in HAZ. The changes of magnetic properties showed a significant increase in core loss and magnetic field strength with decrease in the relative permeability. The study is useful for electric motor industries to generate varieties during stacked welding of transformer core as per the need of the application.
{"title":"Influence of heat on the performance of stack welded thin sheets of CRNGO electrical steel","authors":"Bhushan Y. Dharmik, N. K. Lautre","doi":"10.1051/metal/2022022","DOIUrl":"https://doi.org/10.1051/metal/2022022","url":null,"abstract":"An attempt is made to investigate mechanical-microstructural-magnetic properties on the welded Cold Rolled Non-Oriented Electrical steel (CRNGO) sheets. Single 0.5 mm thin sheets susceptible to Tungsten Inert gas (TIG) welding current are stacked and edge welded using a range of welding current from 30 A to 110 A. The influence of weld with varying current is analyzed through various testing for joint performance, micro-hardness, Residual stress, weld seam characterization, Grain size variation and Magnetic property evaluation of post-welded samples. The results showed the variations of micro-hardness varies by 33 HV and 42 HV at the Heat affected zone (HAZ) and Fusion zone (FZ), respectively. The relative residual stress ranged from 26.85 MPa to 127.6 MPa, weld strength ratio is about 42.9%, depth to width ratio varies from 0.446 to 0.527. The ferritic and largest fine grains size of 79.7 μm is transformed to coarse 282 μm in HAZ. The changes of magnetic properties showed a significant increase in core loss and magnetic field strength with decrease in the relative permeability. The study is useful for electric motor industries to generate varieties during stacked welding of transformer core as per the need of the application.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129092238","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Baohui Yuan, Yang He, Jianhua Liu, H. Zhou, Jihong Huang
A new mathematical model for the RH forced oxygen blowing decarburization process which takes the influence of post combustion on decarburization into account is established. Decarburization reactions are considered to take place at four reaction sites. The simulated results of carbon and oxygen contents show relatively good agreement with the experimental data under different oxygen flow rates. At the rapid decarburization stage including the O2 blowing process, 66.1% of the total decarburization amount is removed. By using the forced oxygen blowing decarburization process, the decarburization rate in the bulk steel is improved most significantly. Additionally, the effects of oxygen flow rates on carbon, oxygen and total decarburization rate are evaluated in detail. At 1500 m3 · h−1, the oxygen content is adequate to completely remove carbon of molten steel in the vacuum vessel during the O2 blowing. Combining with the analysis of oxygen flow rates on the decarburization rate at each site, 1500 m3 · h−1 is chosen as the critical oxygen flow rate to achieve the best decarburization performance. The influences of other parameters including initial carbon and oxygen contents and oxygen utilization rate on decarburization are also investigated.
{"title":"Mathematical model for the forced oxygen blowing decarburization process of ultra-low carbon steel during RH treatment","authors":"Baohui Yuan, Yang He, Jianhua Liu, H. Zhou, Jihong Huang","doi":"10.1051/metal/2022054","DOIUrl":"https://doi.org/10.1051/metal/2022054","url":null,"abstract":"A new mathematical model for the RH forced oxygen blowing decarburization process which takes the influence of post combustion on decarburization into account is established. Decarburization reactions are considered to take place at four reaction sites. The simulated results of carbon and oxygen contents show relatively good agreement with the experimental data under different oxygen flow rates. At the rapid decarburization stage including the O2 blowing process, 66.1% of the total decarburization amount is removed. By using the forced oxygen blowing decarburization process, the decarburization rate in the bulk steel is improved most significantly. Additionally, the effects of oxygen flow rates on carbon, oxygen and total decarburization rate are evaluated in detail. At 1500 m3 · h−1, the oxygen content is adequate to completely remove carbon of molten steel in the vacuum vessel during the O2 blowing. Combining with the analysis of oxygen flow rates on the decarburization rate at each site, 1500 m3 · h−1 is chosen as the critical oxygen flow rate to achieve the best decarburization performance. The influences of other parameters including initial carbon and oxygen contents and oxygen utilization rate on decarburization are also investigated.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131865432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yang Hai, Tingsong Yang, Haijun Wang, Zhiqiang Xu, M. Fan
Roll profile electronic temperature control technology (RPETCT) is a roll profile flexible control technology based on the principle of semiconductor thermoelectricity. It can form a specific heat flow in the roll with the help of a multi-stage electronic temperature control device, so as to realize the preset of the original roll profile of the work roll before rolling. In this paper, the finite element model of RPETCT is established, and the experimental platform of RPETCT is built for verification. Based on this, the single-sheet control ability, multi-sheets joint control ability and high-order roll profile generation ability are studied. The results show that increasing the current can improve the regulation ability of quadratic and quartic convexity under the temperature control mode of hot and cold ends. Under the two temperature control modes, the position of the quartic convexity will not change with the current. In the multi-sheets joint control mode, the bulging capacity in the middle of the roll will decrease with the increase of the distance between the sheets. In addition, this paper explores the generation ability of electronic temperature control roll profile under multi-sheets joint control and the roll profile generation rate under different working conditions, and preset the cubic and quartic roll profile curves with good fitting degree.
{"title":"Roll profile preset and control based on electronic temperature control technology","authors":"Yang Hai, Tingsong Yang, Haijun Wang, Zhiqiang Xu, M. Fan","doi":"10.1051/metal/2022066","DOIUrl":"https://doi.org/10.1051/metal/2022066","url":null,"abstract":"Roll profile electronic temperature control technology (RPETCT) is a roll profile flexible control technology based on the principle of semiconductor thermoelectricity. It can form a specific heat flow in the roll with the help of a multi-stage electronic temperature control device, so as to realize the preset of the original roll profile of the work roll before rolling. In this paper, the finite element model of RPETCT is established, and the experimental platform of RPETCT is built for verification. Based on this, the single-sheet control ability, multi-sheets joint control ability and high-order roll profile generation ability are studied. The results show that increasing the current can improve the regulation ability of quadratic and quartic convexity under the temperature control mode of hot and cold ends. Under the two temperature control modes, the position of the quartic convexity will not change with the current. In the multi-sheets joint control mode, the bulging capacity in the middle of the roll will decrease with the increase of the distance between the sheets. In addition, this paper explores the generation ability of electronic temperature control roll profile under multi-sheets joint control and the roll profile generation rate under different working conditions, and preset the cubic and quartic roll profile curves with good fitting degree.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132064783","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Junjie Huang, M. Yang, Yongdu Li, Cengyi Wang, Shuang Li
The effect of two different groove angles on stress corrosion cracking (SCC) sensitivity of welded joints was investigated by electrochemical and SSRT methods, and the fracture surface of tensile specimens was observed by SEM. The electrochemical results show that the corrosion resistance of HAZ region increases with the increase of welding groove angle, while the corrosion resistance of weld region decreases with the increase of welding groove angle. The results of SSRT of the welded joint show that, under the condition of no applied potential, under different welding groove angles (8°/15°), The maximum tensile strength is 546.08 MPa/560.64 MPa, the maximum fracture life is 44.6 h/46.8 h, the maximum elongation after fracture is 9.40%/9.73%, and the maximum reduction of area is 63.53%/65.14%. With the negative increase of applied potential, the SCC sensitivity of welded joint also shows an obvious increasing trend. The fracture morphology of the SSRT tensile test shows that with the negative increase of applied potential, the fracture changes from dimple-like ductile fracture to typical brittle fracture, and obvious stress corrosion fracture occurs.
{"title":"Investigation of stress corrosion cracking behavior of L360QS in different groove angles by electrochemical and SSRT method","authors":"Junjie Huang, M. Yang, Yongdu Li, Cengyi Wang, Shuang Li","doi":"10.1051/metal/2022076","DOIUrl":"https://doi.org/10.1051/metal/2022076","url":null,"abstract":"The effect of two different groove angles on stress corrosion cracking (SCC) sensitivity of welded joints was investigated by electrochemical and SSRT methods, and the fracture surface of tensile specimens was observed by SEM. The electrochemical results show that the corrosion resistance of HAZ region increases with the increase of welding groove angle, while the corrosion resistance of weld region decreases with the increase of welding groove angle. The results of SSRT of the welded joint show that, under the condition of no applied potential, under different welding groove angles (8°/15°), The maximum tensile strength is 546.08 MPa/560.64 MPa, the maximum fracture life is 44.6 h/46.8 h, the maximum elongation after fracture is 9.40%/9.73%, and the maximum reduction of area is 63.53%/65.14%. With the negative increase of applied potential, the SCC sensitivity of welded joint also shows an obvious increasing trend. The fracture morphology of the SSRT tensile test shows that with the negative increase of applied potential, the fracture changes from dimple-like ductile fracture to typical brittle fracture, and obvious stress corrosion fracture occurs.","PeriodicalId":370509,"journal":{"name":"Metallurgical Research & Technology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133831122","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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