Pub Date : 2023-01-22DOI: 10.1080/03019233.2022.2163072
Reza Safavi Nick, L. Teng, Hongliang Yang, A. Tilliander, Björn Glaser, Dong-Yang Sheng, P. Jönsson, J. Björkvall
ABSTRACT A novel horizontal stirring has been introduced to investigate the effect of such a stirring on the ladle profile during the combined stirring process at the refining stage. The multiphaseInterFoam solver has been updated to consider the induction forces imposed on the liquid bath by the magnetic stirrer.During the combined stirring stage, the gas plume is affected by the rotational movement. The gas plume seems to be intact in the lower one-third of the domain, then breaks into clusters in the upper section while the rotational movement of clusters dissipates a large portion of upward momentum of the bubbles. This prevents large openings in the slag layer and respectively, prevents the exposure of steel. It also disperses the bubbles to various sections of the ladle. Hence, such a novel stirring strategy seems to have the potential of improving the cleanness of the liquid steel during the ladle refining process.
{"title":"Mathematical modelling of novel combined stirring method during the final stage of ladle refining","authors":"Reza Safavi Nick, L. Teng, Hongliang Yang, A. Tilliander, Björn Glaser, Dong-Yang Sheng, P. Jönsson, J. Björkvall","doi":"10.1080/03019233.2022.2163072","DOIUrl":"https://doi.org/10.1080/03019233.2022.2163072","url":null,"abstract":"ABSTRACT A novel horizontal stirring has been introduced to investigate the effect of such a stirring on the ladle profile during the combined stirring process at the refining stage. The multiphaseInterFoam solver has been updated to consider the induction forces imposed on the liquid bath by the magnetic stirrer.During the combined stirring stage, the gas plume is affected by the rotational movement. The gas plume seems to be intact in the lower one-third of the domain, then breaks into clusters in the upper section while the rotational movement of clusters dissipates a large portion of upward momentum of the bubbles. This prevents large openings in the slag layer and respectively, prevents the exposure of steel. It also disperses the bubbles to various sections of the ladle. Hence, such a novel stirring strategy seems to have the potential of improving the cleanness of the liquid steel during the ladle refining process.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"721 - 733"},"PeriodicalIF":2.1,"publicationDate":"2023-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47727511","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-22DOI: 10.1080/03019233.2023.2164953
Cheng Yao, Min Wang, Xiao-yu Xie, Chao Gu, Lidong Xing, X. Ai, Y. Bao
ABSTRACT In this paper, the characteristics of manganese sulphide in the continuous casting bloom of 38MnS6 steel were revealed. Manganese sulphide in low oxygen (w(O) = 7 ppm) bloom mainly exists in the form of pure manganese sulphide distributed along grain boundaries. The morphology changes from fine droplets/rods to dendrites with large size and the aspect ratio gradually increases. The thermodynamic calculation results show that manganese sulphide precipitates at the end of solidification (f s = 0.86), and its morphology is related to local supersaturation and extrusion of solid-phase boundary. The solid-phase first transforms from high-temperature ferrite to austenite, then austenite grows up, which compresses the liquid phase boundary enriched with Mn and S and finally forms a large amount of manganese sulphide at the grain boundary. Dendritic, angular and droplet/rod manganese sulphide have different growth processes. Different types of morphological growth processes of manganese sulphide are described by combining crystal growth mechanism and solidification process.
{"title":"Revealing the morphology evolution and distribution of manganese sulphide in the 38MnS6 steel during continuous casting","authors":"Cheng Yao, Min Wang, Xiao-yu Xie, Chao Gu, Lidong Xing, X. Ai, Y. Bao","doi":"10.1080/03019233.2023.2164953","DOIUrl":"https://doi.org/10.1080/03019233.2023.2164953","url":null,"abstract":"ABSTRACT In this paper, the characteristics of manganese sulphide in the continuous casting bloom of 38MnS6 steel were revealed. Manganese sulphide in low oxygen (w(O) = 7 ppm) bloom mainly exists in the form of pure manganese sulphide distributed along grain boundaries. The morphology changes from fine droplets/rods to dendrites with large size and the aspect ratio gradually increases. The thermodynamic calculation results show that manganese sulphide precipitates at the end of solidification (f s = 0.86), and its morphology is related to local supersaturation and extrusion of solid-phase boundary. The solid-phase first transforms from high-temperature ferrite to austenite, then austenite grows up, which compresses the liquid phase boundary enriched with Mn and S and finally forms a large amount of manganese sulphide at the grain boundary. Dendritic, angular and droplet/rod manganese sulphide have different growth processes. Different types of morphological growth processes of manganese sulphide are described by combining crystal growth mechanism and solidification process.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"766 - 774"},"PeriodicalIF":2.1,"publicationDate":"2023-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42534379","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-22DOI: 10.1080/03019233.2022.2164829
Yuewei Sheng, Xiangning Meng, Xiangyang Liu
ABSTRACT The consistency of temperature and grain size is crucial to the quality of the continuous casting slab. In order to study the temperature and grain size of the continuous casting slab as influenced by the cooling spray state, a cellular automatic finite element (CAFE) coupled model was developed. The model was validated by low magnification inspection and infrared temperature measurement. The process of continuous casting was simulated by numerical model. Temperature and grain size distribution in the transverse direction of the continuous casting slab can be controlled by adjusting the nozzle arrangement. The effect of different nozzle positions on the temperature field distribution in the second cooling zone of continuous casting was simulated. The optimal nozzle position was selected with the temperature distribution uniformity as the important index. When the optimized nozzle arrangement is selected, the transverse temperature and grain size of the continuous casting slab are more uniform.
{"title":"Improved temperature and grain size consistency of continuous cast slabs through cooling spray regulation","authors":"Yuewei Sheng, Xiangning Meng, Xiangyang Liu","doi":"10.1080/03019233.2022.2164829","DOIUrl":"https://doi.org/10.1080/03019233.2022.2164829","url":null,"abstract":"ABSTRACT The consistency of temperature and grain size is crucial to the quality of the continuous casting slab. In order to study the temperature and grain size of the continuous casting slab as influenced by the cooling spray state, a cellular automatic finite element (CAFE) coupled model was developed. The model was validated by low magnification inspection and infrared temperature measurement. The process of continuous casting was simulated by numerical model. Temperature and grain size distribution in the transverse direction of the continuous casting slab can be controlled by adjusting the nozzle arrangement. The effect of different nozzle positions on the temperature field distribution in the second cooling zone of continuous casting was simulated. The optimal nozzle position was selected with the temperature distribution uniformity as the important index. When the optimized nozzle arrangement is selected, the transverse temperature and grain size of the continuous casting slab are more uniform.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"757 - 765"},"PeriodicalIF":2.1,"publicationDate":"2023-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43672724","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-01-07DOI: 10.1080/03019233.2022.2160101
Jiaqi Zhao, Min Wang, Deyue Qin, J. Ma, Ningning Wang, Haitao Jiang, Han Ma, Y. Bao
ABSTRACT Aiming at the unsatisfactory removal rate of various inclusions in refining process of spring steel in a steel plant, this study proposes a unequal flow bottom blowing method with an inlet flow ratio of 2:1, and its effectiveness is verified by numerical simulation and actual production. The numerical simulation results show that under the 2:1 bottom blowing method, the molten steel has greater axial flow strength, which is conducive to the inclusion floating to the slag layer. The removal rate of inclusions under the 2:1 bottom blowing method is about 8% higher than that of the equal flow. The production results are consistent with the numerical simulation, when the inlet flow is 100 NL/min, the inclusion removal rate under 2:1 bottom blowing method is about 18% higher than that of equal flow, meanwhile, the total number of inclusions and large size inclusions are lower than that of equal flow.
{"title":"Numerical simulation on inclusion removal behaviours in refining processes of spring steel","authors":"Jiaqi Zhao, Min Wang, Deyue Qin, J. Ma, Ningning Wang, Haitao Jiang, Han Ma, Y. Bao","doi":"10.1080/03019233.2022.2160101","DOIUrl":"https://doi.org/10.1080/03019233.2022.2160101","url":null,"abstract":"ABSTRACT\u0000 Aiming at the unsatisfactory removal rate of various inclusions in refining process of spring steel in a steel plant, this study proposes a unequal flow bottom blowing method with an inlet flow ratio of 2:1, and its effectiveness is verified by numerical simulation and actual production. The numerical simulation results show that under the 2:1 bottom blowing method, the molten steel has greater axial flow strength, which is conducive to the inclusion floating to the slag layer. The removal rate of inclusions under the 2:1 bottom blowing method is about 8% higher than that of the equal flow. The production results are consistent with the numerical simulation, when the inlet flow is 100 NL/min, the inclusion removal rate under 2:1 bottom blowing method is about 18% higher than that of equal flow, meanwhile, the total number of inclusions and large size inclusions are lower than that of equal flow.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"430 - 441"},"PeriodicalIF":2.1,"publicationDate":"2023-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46506486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.1080/03019233.2022.2145422
C. Commandeur, R. Sprik, C. Stolk, G. Louwerse
ABSTRACT When tapping a blast furnace, a break-through of gas through the taphole at the end of a cast needs to be prevented, both to preserve a healthy state of the taphole and to prevent gas and dust from escaping into the environment. In this paper, two acoustic techniques are presented that can be used to prevent gas emissions from the taphole at the end of a cast. The first approach is by using the spectral analysis of the recorded data, the second approach uses a neural network to recognize the popping sounds that announce the slag–gas interface is approaching the taphole level. It was found that with both methods the end of the cast is detected about 4–2 min before the cast is ended.
{"title":"Acoustic emission monitoring to optimize the end-of-cast in blast furnaces","authors":"C. Commandeur, R. Sprik, C. Stolk, G. Louwerse","doi":"10.1080/03019233.2022.2145422","DOIUrl":"https://doi.org/10.1080/03019233.2022.2145422","url":null,"abstract":"ABSTRACT\u0000 When tapping a blast furnace, a break-through of gas through the taphole at the end of a cast needs to be prevented, both to preserve a healthy state of the taphole and to prevent gas and dust from escaping into the environment. In this paper, two acoustic techniques are presented that can be used to prevent gas emissions from the taphole at the end of a cast. The first approach is by using the spectral analysis of the recorded data, the second approach uses a neural network to recognize the popping sounds that announce the slag–gas interface is approaching the taphole level. It was found that with both methods the end of the cast is detected about 4–2 min before the cast is ended.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"442 - 450"},"PeriodicalIF":2.1,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43825696","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-30DOI: 10.1080/03019233.2022.2154952
Y. Liu, Zhixin Ma, Xu-dong Wang, M. Yao
ABSTRACT The casting parameters and behaviour of 61 sticker breakouts were analysed during the continuous casting of the conventional slab. The difference of sticker breakouts between the conventional slabs and wide and heavy slabs was also studied. The results show that the high casting speed or change of casting speed is the main reason. The mould level of the conventional slab is small and not the reason for sticker breakouts, which is different from the causes of wide and heavy slab. In terms of propagation behaviour, there are 14 cases out of 61 sticker breakouts occurred only around one column of thermocouples. The vertical velocity is in the range of 0.3∼2.4 m·min−1, and the horizontal velocity is in the range of 1.0∼9.0 m·min−1. The vertical velocities of the three sticker breakouts are higher than their casting speeds, which is different from the wide and heavy slab.
{"title":"Casting parameters and propagation behaviour of sticker breakout for the conventional slab","authors":"Y. Liu, Zhixin Ma, Xu-dong Wang, M. Yao","doi":"10.1080/03019233.2022.2154952","DOIUrl":"https://doi.org/10.1080/03019233.2022.2154952","url":null,"abstract":"ABSTRACT The casting parameters and behaviour of 61 sticker breakouts were analysed during the continuous casting of the conventional slab. The difference of sticker breakouts between the conventional slabs and wide and heavy slabs was also studied. The results show that the high casting speed or change of casting speed is the main reason. The mould level of the conventional slab is small and not the reason for sticker breakouts, which is different from the causes of wide and heavy slab. In terms of propagation behaviour, there are 14 cases out of 61 sticker breakouts occurred only around one column of thermocouples. The vertical velocity is in the range of 0.3∼2.4 m·min−1, and the horizontal velocity is in the range of 1.0∼9.0 m·min−1. The vertical velocities of the three sticker breakouts are higher than their casting speeds, which is different from the wide and heavy slab.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"678 - 686"},"PeriodicalIF":2.1,"publicationDate":"2022-12-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46995537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-28DOI: 10.1080/03019233.2022.2154990
Yan Song, Xiaojun Hu, K. Chou
ABSTRACT The reaction behaviour of solid 2CaO·SiO2 (C2S) in steel slag is of great interest during the hot-metal dephosphorization process. In the present work, C2S samples were prepared and interfaced with steel slag to investigate the phosphorus diffusion behaviour at the interface of C2S at 1723K at the onset of the slag melting. The results showed that the phosphorus diffusion from the slag to C2S was very rapid with a significant diffusion coefficient of 4.44 × 10−9 m2·s−1. Phosphorus-enriched phases were formed continuously with increasing reaction time. As the reaction time increases, the composition of the diffusion layer becomes closer to 3CaO·P2O5 (C3P) and farther away from the C2S. The results indicate that a hot-metal dephosphorization process with much higher efficiency can be achieved by the careful selection of the interface characteristics between the C2S and steel slag.
{"title":"Phosphorus diffusion at the interface between 2CaO·SiO2 and CaO–SiO2–FeO–P2O5 slag","authors":"Yan Song, Xiaojun Hu, K. Chou","doi":"10.1080/03019233.2022.2154990","DOIUrl":"https://doi.org/10.1080/03019233.2022.2154990","url":null,"abstract":"ABSTRACT The reaction behaviour of solid 2CaO·SiO2 (C2S) in steel slag is of great interest during the hot-metal dephosphorization process. In the present work, C2S samples were prepared and interfaced with steel slag to investigate the phosphorus diffusion behaviour at the interface of C2S at 1723K at the onset of the slag melting. The results showed that the phosphorus diffusion from the slag to C2S was very rapid with a significant diffusion coefficient of 4.44 × 10−9 m2·s−1. Phosphorus-enriched phases were formed continuously with increasing reaction time. As the reaction time increases, the composition of the diffusion layer becomes closer to 3CaO·P2O5 (C3P) and farther away from the C2S. The results indicate that a hot-metal dephosphorization process with much higher efficiency can be achieved by the careful selection of the interface characteristics between the C2S and steel slag.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"687 - 694"},"PeriodicalIF":2.1,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44515007","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-28DOI: 10.1080/03019233.2022.2155761
D. Wei, Hongquan Liu, Rong Wang, Xulong Ren, Qimao Qin
ABSTRACT The use of alloying technology can improve the surface mechanical properties of 40Cr steel and prolong its service life. In this study, the Ni/VC surface alloying modification treatment of 40Cr steel was carried out using electron beam defocusing. The results show that after defocusing electron beam treatment, the cross-section of the specimen is composed of alloying layer, heat-affected zone and matrix. When the VC content is 80%, the maximum hardness is 1030 HV0.1, which is 4.3 times higher than that of the 40Cr matrix (240 HV0.1), and the lowest coefficient of friction (COF) is 0.395, which is 1.9 times lower than that of the matrix (0.757). The wear mechanism of the matrix is mainly severe abrasive wear, and the wear mechanisms of the three specimens are mainly slight abrasive wear, slight fatigue wear and adhesive wear.
{"title":"Effect of defocused electron beam surface Ni/VC alloying on microstructure and properties of 40Cr steel","authors":"D. Wei, Hongquan Liu, Rong Wang, Xulong Ren, Qimao Qin","doi":"10.1080/03019233.2022.2155761","DOIUrl":"https://doi.org/10.1080/03019233.2022.2155761","url":null,"abstract":"ABSTRACT The use of alloying technology can improve the surface mechanical properties of 40Cr steel and prolong its service life. In this study, the Ni/VC surface alloying modification treatment of 40Cr steel was carried out using electron beam defocusing. The results show that after defocusing electron beam treatment, the cross-section of the specimen is composed of alloying layer, heat-affected zone and matrix. When the VC content is 80%, the maximum hardness is 1030 HV0.1, which is 4.3 times higher than that of the 40Cr matrix (240 HV0.1), and the lowest coefficient of friction (COF) is 0.395, which is 1.9 times lower than that of the matrix (0.757). The wear mechanism of the matrix is mainly severe abrasive wear, and the wear mechanisms of the three specimens are mainly slight abrasive wear, slight fatigue wear and adhesive wear.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"695 - 704"},"PeriodicalIF":2.1,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42425852","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-28DOI: 10.1080/03019233.2022.2156706
A. Güral, O. Çavuşoğlu, Buğra Şahin, O. Altuntaş, T. Yılmaz
ABSTRACT In this study, the effects of room temperature static strain aging period on the tensile properties of DP600 dual-phase steel were investigated. 6% and 12% of pre-strained DP600 steels were carried out static strain aging treatment at room temperature for up to 4 months. It was observed that with increasing both pre-strain rate and room temperature static aging period, the tensile strength values increased and ductility values decreased significantly. Also, dual-phase steels maintain the continuous yield behaviour which is general characteristic. The fracture surfaces exhibited a lower depth dimple type mode with increasing room temperature static strain aging period.
{"title":"Long-time strain aging responses of commercial dual-phase steels at room temperature","authors":"A. Güral, O. Çavuşoğlu, Buğra Şahin, O. Altuntaş, T. Yılmaz","doi":"10.1080/03019233.2022.2156706","DOIUrl":"https://doi.org/10.1080/03019233.2022.2156706","url":null,"abstract":"ABSTRACT In this study, the effects of room temperature static strain aging period on the tensile properties of DP600 dual-phase steel were investigated. 6% and 12% of pre-strained DP600 steels were carried out static strain aging treatment at room temperature for up to 4 months. It was observed that with increasing both pre-strain rate and room temperature static aging period, the tensile strength values increased and ductility values decreased significantly. Also, dual-phase steels maintain the continuous yield behaviour which is general characteristic. The fracture surfaces exhibited a lower depth dimple type mode with increasing room temperature static strain aging period.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"705 - 709"},"PeriodicalIF":2.1,"publicationDate":"2022-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48725719","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-25DOI: 10.1080/03019233.2022.2156707
Zhenxing Xing, Zhuang Huang, Gongjin Cheng, Han Yang, Xiangxin Xue
ABSTRACT The compressive strength of pellets is of great significance for the evaluation of pellets quality indexes. In this paper, the chemical composition, mineral phase composition and microstructure of pellets were analyzed by ICPAES, XRD, OM and SEM-EDS through oxidation roasting and gas-based reduction experiments. The effect mechanism of thermal regulation on the compressive strength and reduction performance of pellets was explained by the micro-indicators such as porosity, Vickers hardness and morphological structure of pellets. The results showed that with the increase of the roasting temperature and the extension of the roasting time, the internal porosity of the oxidized pellets was reduced, while the compressive strength of the pellets was continuously improved, and the roasting temperature had a greater influence on the compressive strength. However, the increase in porosity of the reduced pellets weakened the intergranular bonding between the particles, which led to a reduction in compressive strength.
{"title":"Consolidation and reduction behaviour of pellets with sea sand vanadium titanomagnetite: a microscopic interpretation of macroscopic properties","authors":"Zhenxing Xing, Zhuang Huang, Gongjin Cheng, Han Yang, Xiangxin Xue","doi":"10.1080/03019233.2022.2156707","DOIUrl":"https://doi.org/10.1080/03019233.2022.2156707","url":null,"abstract":"ABSTRACT The compressive strength of pellets is of great significance for the evaluation of pellets quality indexes. In this paper, the chemical composition, mineral phase composition and microstructure of pellets were analyzed by ICPAES, XRD, OM and SEM-EDS through oxidation roasting and gas-based reduction experiments. The effect mechanism of thermal regulation on the compressive strength and reduction performance of pellets was explained by the micro-indicators such as porosity, Vickers hardness and morphological structure of pellets. The results showed that with the increase of the roasting temperature and the extension of the roasting time, the internal porosity of the oxidized pellets was reduced, while the compressive strength of the pellets was continuously improved, and the roasting temperature had a greater influence on the compressive strength. However, the increase in porosity of the reduced pellets weakened the intergranular bonding between the particles, which led to a reduction in compressive strength.","PeriodicalId":14753,"journal":{"name":"Ironmaking & Steelmaking","volume":"50 1","pages":"710 - 720"},"PeriodicalIF":2.1,"publicationDate":"2022-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47114404","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：