Pub Date : 2020-11-01DOI: 10.1080/13640461.2020.1853392
H. Honarjoo, R. Raiszadeh
ABSTRACT The formation of bonding between Al and Fe after the initial compound casting and during a heat treatment regime is investigated. No significant bonding was observed between the two metals after the initial casting. This observation was attributed to the presence of oxide films on the liquid Al and solid Fe alloys. The heat treatment of the cast part at 973 K (700°C) for at least 15 min is shown to cause the two alloys to bond to each other seamlessly. The cracks that formed on the Al oxide layer (due to the pouring stresses or the remelting of the alloy) is suggested to provide the necessary paths for the contact between the Al melt and the trapped atmosphere between the Al and Fe alloys, and the contact between the Al melt and the Fe surface. A detailed mechanism for the bonding is presented in this paper.
{"title":"Mechanism of bonding of Fe/Al bimetal during heat treatment of compound cast parts","authors":"H. Honarjoo, R. Raiszadeh","doi":"10.1080/13640461.2020.1853392","DOIUrl":"https://doi.org/10.1080/13640461.2020.1853392","url":null,"abstract":"ABSTRACT The formation of bonding between Al and Fe after the initial compound casting and during a heat treatment regime is investigated. No significant bonding was observed between the two metals after the initial casting. This observation was attributed to the presence of oxide films on the liquid Al and solid Fe alloys. The heat treatment of the cast part at 973 K (700°C) for at least 15 min is shown to cause the two alloys to bond to each other seamlessly. The cracks that formed on the Al oxide layer (due to the pouring stresses or the remelting of the alloy) is suggested to provide the necessary paths for the contact between the Al melt and the trapped atmosphere between the Al and Fe alloys, and the contact between the Al melt and the Fe surface. A detailed mechanism for the bonding is presented in this paper.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"266 - 277"},"PeriodicalIF":1.4,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1853392","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"60012509","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2020-11-01DOI: 10.1080/13640461.2020.1843778
N. Tenaglia, A. Basso, J. Massone, R. Boeri
ABSTRACT High-silicon cast steels and proper heat treatment cycles were designed in order to obtain carbide-free bainitic microstructures. The design process allowed to obtain the desired microstructures after heat treatment cycles compatible with industrial practices and using low amounts of inexpensive alloying elements. The different chemical compositions and austempering temperatures tested resulted in ultra-high-strength steels showing remarkably total elongations. The obtained tensile properties satisfy the minimum requirements specified for AHSS in ASTM A1088 standard, and also the requirements for high-strength cast steels stated in ASTM A148. Moreover, many microstructures developed in this work reach the tensile performance of the very expensive maraging steels.
{"title":"Development of ultra-high strength carbide-free bainitic cast steels","authors":"N. Tenaglia, A. Basso, J. Massone, R. Boeri","doi":"10.1080/13640461.2020.1843778","DOIUrl":"https://doi.org/10.1080/13640461.2020.1843778","url":null,"abstract":"ABSTRACT High-silicon cast steels and proper heat treatment cycles were designed in order to obtain carbide-free bainitic microstructures. The design process allowed to obtain the desired microstructures after heat treatment cycles compatible with industrial practices and using low amounts of inexpensive alloying elements. The different chemical compositions and austempering temperatures tested resulted in ultra-high-strength steels showing remarkably total elongations. The obtained tensile properties satisfy the minimum requirements specified for AHSS in ASTM A1088 standard, and also the requirements for high-strength cast steels stated in ASTM A148. Moreover, many microstructures developed in this work reach the tensile performance of the very expensive maraging steels.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"258 - 265"},"PeriodicalIF":1.4,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1843778","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49391110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2020-10-21DOI: 10.1080/13640461.2020.1833477
M. Landesberger, R. Koos, Maximilian Erber, Matteo Pernumian, S. Masaggia, M. Hoelzel, W. Volk
ABSTRACT Optical analysis, dilatometry as well as neutron diffraction are utilised to investigate the phase transition within ductile iron both in-situ and after the heat treatment process for perferritic isothermed ductile iron (IDI). A suitable annealing temperature is chosen by calculating a phase diagram for the investigated alloy. The phase transition which happens slightly above upper intercritical temperature is followed by neutron diffraction, while dilatometry elucidates the IDI microstructure evolution for cooling rates from 40 to 0.125 K/s. The dilatometry results are visualised in a CCT diagram and further investigated with metallography. An additionally used colour etching method is basis for discussing the formation of the pearlitic/ferritic network. The presence of 2 vol.-% of ferrite was sufficient to achieve the typical IDI microstructure. Finally, the cementite phase volume fractions and crystal structure are evaluated. . The lattice constants of ferrite and cementite were independent of the formed microstructure.
{"title":"Phase transition and microstructure investigation of perferritic isothermed ductile iron (IDI)","authors":"M. Landesberger, R. Koos, Maximilian Erber, Matteo Pernumian, S. Masaggia, M. Hoelzel, W. Volk","doi":"10.1080/13640461.2020.1833477","DOIUrl":"https://doi.org/10.1080/13640461.2020.1833477","url":null,"abstract":"ABSTRACT Optical analysis, dilatometry as well as neutron diffraction are utilised to investigate the phase transition within ductile iron both in-situ and after the heat treatment process for perferritic isothermed ductile iron (IDI). A suitable annealing temperature is chosen by calculating a phase diagram for the investigated alloy. The phase transition which happens slightly above upper intercritical temperature is followed by neutron diffraction, while dilatometry elucidates the IDI microstructure evolution for cooling rates from 40 to 0.125 K/s. The dilatometry results are visualised in a CCT diagram and further investigated with metallography. An additionally used colour etching method is basis for discussing the formation of the pearlitic/ferritic network. The presence of 2 vol.-% of ferrite was sufficient to achieve the typical IDI microstructure. Finally, the cementite phase volume fractions and crystal structure are evaluated. . The lattice constants of ferrite and cementite were independent of the formed microstructure.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"233 - 241"},"PeriodicalIF":1.4,"publicationDate":"2020-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1833477","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41849376","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2020-10-21DOI: 10.1080/13640461.2020.1838077
B. Lin, S. Xia, Yue Tang, Yuliang Zhao, Kun Liu, Huaqiang Xiao, Shaobo Li, Weiweng Zhang
ABSTRACT The effect of thermal exposure on the elevated-temperature mechanical properties of heat-treated Al-12Si-4Cu-1Ni-1 Mg-2Mn piston alloys was investigated using optical microscopy (OM), scanning electron microscope (SEM), transmission electron microscopy (TEM), and tensile tests at elevated temperatures. The results showed that coarsening of the strengthening precipitates following a prolonged exposure at 350°C had a deleterious effect on the elevated-temperature tensile properties. Further thermal exposure up to 50 h did not result in even a slight reduction in the strength. After exposure at 350°C, the value of elevated-temperature ultimate tensile strengths of Al-12Si-4Cu-1Ni-1 Mg-2Mn piston alloys were 92, 80, and 73 MPa for 0 h, 10 h, and 100 h of thermal exposure, respectively, which are superior to those of the commercial piston alloys. The high-performance, elevated-temperature mechanical properties of Al-12Si-4Cu-1Ni-1 Mg-2Mn piston alloys can be attributed to the high thermal stability Mn-rich intermetallics and Al3CuNi.
{"title":"Effects of thermal exposure on the microstructure and mechanical properties of Al-12Si-4Cu-1Ni-1Mg-2Mn piston alloys","authors":"B. Lin, S. Xia, Yue Tang, Yuliang Zhao, Kun Liu, Huaqiang Xiao, Shaobo Li, Weiweng Zhang","doi":"10.1080/13640461.2020.1838077","DOIUrl":"https://doi.org/10.1080/13640461.2020.1838077","url":null,"abstract":"ABSTRACT The effect of thermal exposure on the elevated-temperature mechanical properties of heat-treated Al-12Si-4Cu-1Ni-1 Mg-2Mn piston alloys was investigated using optical microscopy (OM), scanning electron microscope (SEM), transmission electron microscopy (TEM), and tensile tests at elevated temperatures. The results showed that coarsening of the strengthening precipitates following a prolonged exposure at 350°C had a deleterious effect on the elevated-temperature tensile properties. Further thermal exposure up to 50 h did not result in even a slight reduction in the strength. After exposure at 350°C, the value of elevated-temperature ultimate tensile strengths of Al-12Si-4Cu-1Ni-1 Mg-2Mn piston alloys were 92, 80, and 73 MPa for 0 h, 10 h, and 100 h of thermal exposure, respectively, which are superior to those of the commercial piston alloys. The high-performance, elevated-temperature mechanical properties of Al-12Si-4Cu-1Ni-1 Mg-2Mn piston alloys can be attributed to the high thermal stability Mn-rich intermetallics and Al3CuNi.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"250 - 257"},"PeriodicalIF":1.4,"publicationDate":"2020-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1838077","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48038344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2020-10-20DOI: 10.1080/13640461.2020.1838078
Judit Svidró, A. Diószegi, József Tamás Svidró
ABSTRACT In this study, thermophysical properties of a commonly used silica sand were investigated and their relation to its granulometric and chemical composition was studied. Thermal expansion and differential scanning calorimetry tests were performed on individual fractions of the silica sand together with X-ray fluorescence measurements to determine their constituents. It was found that the various size fractions of silica sand exhibit different levels of thermal expansion based on the differences in SiO2 content. The expansion behaviour of two additional silica samples and a recycled olivine sand was also investigated in relation to its grain size to justify the findings.
{"title":"The origin of thermal expansion differences in various size fractions of silica sand","authors":"Judit Svidró, A. Diószegi, József Tamás Svidró","doi":"10.1080/13640461.2020.1838078","DOIUrl":"https://doi.org/10.1080/13640461.2020.1838078","url":null,"abstract":"ABSTRACT In this study, thermophysical properties of a commonly used silica sand were investigated and their relation to its granulometric and chemical composition was studied. Thermal expansion and differential scanning calorimetry tests were performed on individual fractions of the silica sand together with X-ray fluorescence measurements to determine their constituents. It was found that the various size fractions of silica sand exhibit different levels of thermal expansion based on the differences in SiO2 content. The expansion behaviour of two additional silica samples and a recycled olivine sand was also investigated in relation to its grain size to justify the findings.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"242 - 249"},"PeriodicalIF":1.4,"publicationDate":"2020-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1838078","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46044914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2020-09-02DOI: 10.1080/13640461.2020.1832308
J. Lacaze, C. Moussa, Y. Thébault, W. Guesser
ABSTRACT For improving the mechanical strength of cast irons, a fully pearlitic matrix is sought by alloying with tin, copper and manganese. This applies in particular to the compacted graphite irons considered here. While average macro- and micro-hardness values were similar for the four fully pearlitic alloys under study, it was found that high copper and low tin content showed some very high maximum micro-hardness values, significantly higher than the corresponding mean. Such values may be seen as hard points in the material that would certainly impair machinability. Discussion of the reasons for these extreme values opens directions for further studies.
{"title":"Extrema of micro-hardness in fully pearlitic compacted graphite cast iron","authors":"J. Lacaze, C. Moussa, Y. Thébault, W. Guesser","doi":"10.1080/13640461.2020.1832308","DOIUrl":"https://doi.org/10.1080/13640461.2020.1832308","url":null,"abstract":"ABSTRACT For improving the mechanical strength of cast irons, a fully pearlitic matrix is sought by alloying with tin, copper and manganese. This applies in particular to the compacted graphite irons considered here. While average macro- and micro-hardness values were similar for the four fully pearlitic alloys under study, it was found that high copper and low tin content showed some very high maximum micro-hardness values, significantly higher than the corresponding mean. Such values may be seen as hard points in the material that would certainly impair machinability. Discussion of the reasons for these extreme values opens directions for further studies.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"218 - 225"},"PeriodicalIF":1.4,"publicationDate":"2020-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1832308","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42218102","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2020-09-02DOI: 10.1080/13640461.2020.1822573
F. O. Lima, L. F. Bauri, H. B. Pereira, C. Azevedo
ABSTRACT The effects of cooling rate and carbon equivalent on the tensile strength of pearlitic lamellar graphite cast irons were investigated. The cooling rate was varied from 6°C/s to 35°C/s for values of the carbon equivalent equal to 4.17% and 3.83%. The increase in the cooling rate promoted the refining of the eutectic cell size, primary dendrite modulus, interdendritic hydraulic diameter and pearlite interlamellar spacing. The increase in the cooling rate also refined their graphite flakes, changing the morphology from B to E type. The reduction in the carbon equivalent increased the proportion of primary dendrites from 25% to 40%. The maximum tensile strength increased from 274 to 524 MPa with the increase in the cooling rate and the reduction in the carbon equivalent. These results were used to test two tensile strength predictive models based on modified versions of the Griffith and Hall-Petch equations.
{"title":"Effect of the cooling rate on the tensile strength of pearlitic lamellar graphite cast iron","authors":"F. O. Lima, L. F. Bauri, H. B. Pereira, C. Azevedo","doi":"10.1080/13640461.2020.1822573","DOIUrl":"https://doi.org/10.1080/13640461.2020.1822573","url":null,"abstract":"ABSTRACT The effects of cooling rate and carbon equivalent on the tensile strength of pearlitic lamellar graphite cast irons were investigated. The cooling rate was varied from 6°C/s to 35°C/s for values of the carbon equivalent equal to 4.17% and 3.83%. The increase in the cooling rate promoted the refining of the eutectic cell size, primary dendrite modulus, interdendritic hydraulic diameter and pearlite interlamellar spacing. The increase in the cooling rate also refined their graphite flakes, changing the morphology from B to E type. The reduction in the carbon equivalent increased the proportion of primary dendrites from 25% to 40%. The maximum tensile strength increased from 274 to 524 MPa with the increase in the cooling rate and the reduction in the carbon equivalent. These results were used to test two tensile strength predictive models based on modified versions of the Griffith and Hall-Petch equations.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"201 - 217"},"PeriodicalIF":1.4,"publicationDate":"2020-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1822573","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46830601","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2020-09-02DOI: 10.1080/13640461.2020.1834176
Min-Kyu Paek, Junmo Jeon, D. Lindberg
ABSTRACT The evolution of nitrogen gas formation in cast iron was studied based on the information of the N solubility in the carbon-saturated iron-containing Mn and Si over the wide temperature range. In order to verify the accuracy of the Fe-Mn-Si-C phase diagram, the transition temperatures of the Fe-Mn-2.7 wt%Si-Csat alloys were measured according to the Mn concentration using a differential scanning calorimetry under the purified Ar atmosphere. The recent thermodynamic modelling result of the Fe-Mn-Si-C-N system was used to describe the solubility limit of N in liquid and solid solution in the carbon saturated iron alloys. The cooling and quenching experiments were also carried out to check the effects of temperature and phase transformation on the N solubility limit in the temperature range from 500°C to 900°C.
{"title":"Thermodynamic behaviour of nitrogen in the carbon saturated Fe-Mn-Si alloy during casting","authors":"Min-Kyu Paek, Junmo Jeon, D. Lindberg","doi":"10.1080/13640461.2020.1834176","DOIUrl":"https://doi.org/10.1080/13640461.2020.1834176","url":null,"abstract":"ABSTRACT The evolution of nitrogen gas formation in cast iron was studied based on the information of the N solubility in the carbon-saturated iron-containing Mn and Si over the wide temperature range. In order to verify the accuracy of the Fe-Mn-Si-C phase diagram, the transition temperatures of the Fe-Mn-2.7 wt%Si-Csat alloys were measured according to the Mn concentration using a differential scanning calorimetry under the purified Ar atmosphere. The recent thermodynamic modelling result of the Fe-Mn-Si-C-N system was used to describe the solubility limit of N in liquid and solid solution in the carbon saturated iron alloys. The cooling and quenching experiments were also carried out to check the effects of temperature and phase transformation on the N solubility limit in the temperature range from 500°C to 900°C.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"226 - 232"},"PeriodicalIF":1.4,"publicationDate":"2020-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1834176","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42393504","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2020-09-02DOI: 10.1080/13640461.2020.1822632
O. Trudonoshyn, O. Prach, A. Slyudova, V. Lisovskii
ABSTRACT The process of multistep nucleation during solidification in hypoeutectic Al-Mg-Si casting alloys was investigated. The morphology of the nucleating particles, Mg2Si primary crystals and Al-Mg2Si eutectic, was investigated with scanning electron microscopy (SEM) on polished and deep etched microsections. The mechanism of formation of the Mg2Si crystal was attributed to heterogeneous nucleation on the nucleating particles. It was observed that the majority of the alloys particles found in the studied are oxides. It was established that eutectic Al–Mg2Si in hypoeutectic alloys has the morphology of ‘eutectic crystal’, where one face of the crystal has triangular-spiral morphology. The mechanism of formation of Al-Mg2Si eutectic cells is attributed to epitaxial growth on Mg2Si crystals. The microhardness of the structural components (Mg2Si crystals, α-Al dendrites, Al-Mg2Si eutectic, and Al3Ti crystals) was measured using Vickers hardness tester.
{"title":"Structure formation and multistep nucleation in CASTING Al-Mg-Si alloys","authors":"O. Trudonoshyn, O. Prach, A. Slyudova, V. Lisovskii","doi":"10.1080/13640461.2020.1822632","DOIUrl":"https://doi.org/10.1080/13640461.2020.1822632","url":null,"abstract":"ABSTRACT The process of multistep nucleation during solidification in hypoeutectic Al-Mg-Si casting alloys was investigated. The morphology of the nucleating particles, Mg2Si primary crystals and Al-Mg2Si eutectic, was investigated with scanning electron microscopy (SEM) on polished and deep etched microsections. The mechanism of formation of the Mg2Si crystal was attributed to heterogeneous nucleation on the nucleating particles. It was observed that the majority of the alloys particles found in the studied are oxides. It was established that eutectic Al–Mg2Si in hypoeutectic alloys has the morphology of ‘eutectic crystal’, where one face of the crystal has triangular-spiral morphology. The mechanism of formation of Al-Mg2Si eutectic cells is attributed to epitaxial growth on Mg2Si crystals. The microhardness of the structural components (Mg2Si crystals, α-Al dendrites, Al-Mg2Si eutectic, and Al3Ti crystals) was measured using Vickers hardness tester.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"184 - 193"},"PeriodicalIF":1.4,"publicationDate":"2020-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1822632","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44514213","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 : 2020-09-02DOI: 10.1080/13640461.2020.1822572
Feng-jun Li, Hua Zhao, F. Ren, Shaobiao Song, X. Shao, A. Volinsky
ABSTRACT A new method for mould filling calculation of lost foam casting (LFC) was developed based on the main hypothesis, which assumes that every point on the melt-pattern interface moves in the radial direction. The value of the normal velocity is calculated by an empirical formula, which is the function of the degree of vacuum, pattern density, pouring temperature, metallic static head, etc. At a given time step, every interface point moves to a new position, and all the points form the shape of the melt-pattern interface. Based on the new position of the interface and the given velocity of the interface cell, the fluid flow and the temperature distribution of the molten metal can be calculated during the mould filling process of LFC. The calculated results were validated by experiments.
{"title":"Simulations and experiments of mould filling in lost foam casting","authors":"Feng-jun Li, Hua Zhao, F. Ren, Shaobiao Song, X. Shao, A. Volinsky","doi":"10.1080/13640461.2020.1822572","DOIUrl":"https://doi.org/10.1080/13640461.2020.1822572","url":null,"abstract":"ABSTRACT A new method for mould filling calculation of lost foam casting (LFC) was developed based on the main hypothesis, which assumes that every point on the melt-pattern interface moves in the radial direction. The value of the normal velocity is calculated by an empirical formula, which is the function of the degree of vacuum, pattern density, pouring temperature, metallic static head, etc. At a given time step, every interface point moves to a new position, and all the points form the shape of the melt-pattern interface. Based on the new position of the interface and the given velocity of the interface cell, the fluid flow and the temperature distribution of the molten metal can be calculated during the mould filling process of LFC. The calculated results were validated by experiments.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":"33 1","pages":"194 - 200"},"PeriodicalIF":1.4,"publicationDate":"2020-09-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1822572","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41687303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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