Pub Date : 2020-12-19DOI: 10.1080/13640461.2020.1846959
M. Aslam
ABSTRACT Shapiro–Wilks test is popularly used for testing the normality of the data. Shapiro–Wilks test using the idea of neutrosophic statistics is discussed in this paper. The necessary equations are given under the indeterminacy environment. The testing procedure of the proposed test is given and explained with the help of chemical data. The performance of the proposed Shapiro–Wilks test is discussed with the Shapiro–Wilks test under the classical statistics. From the comparison, it is concluded that the proposed Shapiro–Wilks test is affective to apply when the data are obtained under uncertain environment.
{"title":"Analysing Gray Cast Iron Data using a New Shapiro-Wilks test for Normality under Indeterminacy","authors":"M. Aslam","doi":"10.1080/13640461.2020.1846959","DOIUrl":"https://doi.org/10.1080/13640461.2020.1846959","url":null,"abstract":"ABSTRACT Shapiro–Wilks test is popularly used for testing the normality of the data. Shapiro–Wilks test using the idea of neutrosophic statistics is discussed in this paper. The necessary equations are given under the indeterminacy environment. The testing procedure of the proposed test is given and explained with the help of chemical data. The performance of the proposed Shapiro–Wilks test is discussed with the Shapiro–Wilks test under the classical statistics. From the comparison, it is concluded that the proposed Shapiro–Wilks test is affective to apply when the data are obtained under uncertain environment.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2020-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1846959","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44147957","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 : 2020-12-16DOI: 10.1080/13640461.2020.1861856
G. Peng, Y. Gu, G. Song, Y. Wang, Songyi Chen
ABSTRACT The first-principle calculation was used to understand new insight of Ca element refining grain structure in commercial purity Mg. Negative adsorption energy, strong ionic bond and negative shift of partial density of states verify that Ca element is readily adsorbed on the surface of MgO. Combined with analysis of interfacial bonding between Mg2Ca and α-Mg, new insight of Mg2Ca layer formed via Ca adsorption efficiently nucleating α-Mg was proposed. Adsorption of other alkaline earth elements (Be, Sr or Ba) and the crystallographic feature of Be, Mg17Sr2 and Mg17Ba2 along with the experimental results further consolidate new insight of Ca element refining grain structure in commercial purity Mg.
{"title":"New insight of Ca element refining grain structure in commercial purity Mg based on the first-principle calculation","authors":"G. Peng, Y. Gu, G. Song, Y. Wang, Songyi Chen","doi":"10.1080/13640461.2020.1861856","DOIUrl":"https://doi.org/10.1080/13640461.2020.1861856","url":null,"abstract":"ABSTRACT The first-principle calculation was used to understand new insight of Ca element refining grain structure in commercial purity Mg. Negative adsorption energy, strong ionic bond and negative shift of partial density of states verify that Ca element is readily adsorbed on the surface of MgO. Combined with analysis of interfacial bonding between Mg2Ca and α-Mg, new insight of Mg2Ca layer formed via Ca adsorption efficiently nucleating α-Mg was proposed. Adsorption of other alkaline earth elements (Be, Sr or Ba) and the crystallographic feature of Be, Mg17Sr2 and Mg17Ba2 along with the experimental results further consolidate new insight of Ca element refining grain structure in commercial purity Mg.","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2020-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1861856","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41676524","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: 10.1080/13640461.2020.1853929
Aslı Önür, Gülşah Germen Tutaş, Hüseyin Şevik
ABSTRACT In the present study, the effect of Ce alloying element with different quantities (1 and 2 wt.%) on the microstructure and mechanical properties of Mg-5Sn-2Al alloy was investigated. Phase analyses and microstructural studies were carried out using XRD and SEM. It was observed that base alloy was composed of the α-Mg and Mg2Sn intermetallic phase, and after Ce addition Ce5Sn4 intermetallic phase was formed. Also, an increase was detected on the microhardness of the base alloy with increasing Ce addition. The test results showed that Ce addition has no notable effect on the tensile properties at room temperature but has a positive effect at elevated temperatures. Furthermore, creep properties of the Mg-5Sn-2Al alloy were obviously improved by adding Ce. The values of stress exponents and activation energy indicated that the dominant creep mechanisms of the alloys were identified dislocation climb controlled creep..
{"title":"Role of Cerium on the creep properties of the Mg-Sn-Al based alloys","authors":"Aslı Önür, Gülşah Germen Tutaş, Hüseyin Şevik","doi":"10.1080/13640461.2020.1853929","DOIUrl":"https://doi.org/10.1080/13640461.2020.1853929","url":null,"abstract":"ABSTRACT In the present study, the effect of Ce alloying element with different quantities (1 and 2 wt.%) on the microstructure and mechanical properties of Mg-5Sn-2Al alloy was investigated. Phase analyses and microstructural studies were carried out using XRD and SEM. It was observed that base alloy was composed of the α-Mg and Mg2Sn intermetallic phase, and after Ce addition Ce5Sn4 intermetallic phase was formed. Also, an increase was detected on the microhardness of the base alloy with increasing Ce addition. The test results showed that Ce addition has no notable effect on the tensile properties at room temperature but has a positive effect at elevated temperatures. Furthermore, creep properties of the Mg-5Sn-2Al alloy were obviously improved by adding Ce. The values of stress exponents and activation energy indicated that the dominant creep mechanisms of the alloys were identified dislocation climb controlled creep..","PeriodicalId":13939,"journal":{"name":"International Journal of Cast Metals Research","volume":null,"pages":null},"PeriodicalIF":1.4,"publicationDate":"2020-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1080/13640461.2020.1853929","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45181012","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: 10.1080/13640461.2020.1853392
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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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":null,"pages":null},"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}
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