Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel
Different austenitizing temperatures were used to obtain medium-carbon low-alloy (MCLA) steels with different initial states of tempering, including lath martensite microstructures and matrix carbon contents. The effects of these factors on the tempered carbides and impact toughness of the MCLA stee...
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| Format: | Article |
| Language: | English |
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Elsevier
2020-07-01
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| Series: | Journal of Materials Research and Technology |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2238785420312679 |
| _version_ | 1818970978664841216 |
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| author | Chen Sun Pai-Xian Fu Xiao-Ping Ma Hang-Hang Liu Ning-Yu Du Yan-Fei Cao Hong-Wei Liu Dian-Zhong Li |
| author_facet | Chen Sun Pai-Xian Fu Xiao-Ping Ma Hang-Hang Liu Ning-Yu Du Yan-Fei Cao Hong-Wei Liu Dian-Zhong Li |
| author_sort | Chen Sun |
| collection | DOAJ |
| description | Different austenitizing temperatures were used to obtain medium-carbon low-alloy (MCLA) steels with different initial states of tempering, including lath martensite microstructures and matrix carbon contents. The effects of these factors on the tempered carbides and impact toughness of the MCLA steels were investigated via optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the matrix carbon content and lath martensite substructure sizes could be effectively controlled by the austenitizing temperature. The morphologies of the tempered carbides precipitated at the boundaries were controlled by both the matrix carbon content and the lath martensite substructure sizes. Higher matrix carbon content and boundary densities increased the nucleation rate and promoted the formation of spherical carbides. The spheroidization of carbides was conducive to improving the impact toughness. However, the decrease in the density of high-angle grain boundaries and the appearance of long strip-shaped carbides drastically reduced the impact toughness. |
| first_indexed | 2024-12-20T14:45:04Z |
| format | Article |
| id | doaj.art-f3e7114e299f4869b244e9c04f7e798e |
| institution | Directory Open Access Journal |
| issn | 2238-7854 |
| language | English |
| last_indexed | 2024-12-20T14:45:04Z |
| publishDate | 2020-07-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Materials Research and Technology |
| spelling | doaj.art-f3e7114e299f4869b244e9c04f7e798e2022-12-21T19:37:10ZengElsevierJournal of Materials Research and Technology2238-78542020-07-019477017710Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steelChen Sun0Pai-Xian Fu1Xiao-Ping Ma2Hang-Hang Liu3Ning-Yu Du4Yan-Fei Cao5Hong-Wei Liu6Dian-Zhong Li7Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China 72 Wenhua Road, Shenyang 110016, China; Corresponding authors.Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China 72 Wenhua Road, Shenyang 110016, ChinaShenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China; School of Materials Science and Engineering, University of Science and Technology of China 72 Wenhua Road, Shenyang 110016, China; Corresponding authors.Different austenitizing temperatures were used to obtain medium-carbon low-alloy (MCLA) steels with different initial states of tempering, including lath martensite microstructures and matrix carbon contents. The effects of these factors on the tempered carbides and impact toughness of the MCLA steels were investigated via optical microscopy (OM), scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results showed that the matrix carbon content and lath martensite substructure sizes could be effectively controlled by the austenitizing temperature. The morphologies of the tempered carbides precipitated at the boundaries were controlled by both the matrix carbon content and the lath martensite substructure sizes. Higher matrix carbon content and boundary densities increased the nucleation rate and promoted the formation of spherical carbides. The spheroidization of carbides was conducive to improving the impact toughness. However, the decrease in the density of high-angle grain boundaries and the appearance of long strip-shaped carbides drastically reduced the impact toughness.http://www.sciencedirect.com/science/article/pii/S2238785420312679Medium-carbon low-alloy steelMatrix carbon contentLath martensiteCarbidesImpact toughness |
| spellingShingle | Chen Sun Pai-Xian Fu Xiao-Ping Ma Hang-Hang Liu Ning-Yu Du Yan-Fei Cao Hong-Wei Liu Dian-Zhong Li Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel Journal of Materials Research and Technology Medium-carbon low-alloy steel Matrix carbon content Lath martensite Carbides Impact toughness |
| title | Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel |
| title_full | Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel |
| title_fullStr | Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel |
| title_full_unstemmed | Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel |
| title_short | Effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium-carbon low-alloy steel |
| title_sort | effect of matrix carbon content and lath martensite microstructures on the tempered precipitates and impact toughness of a medium carbon low alloy steel |
| topic | Medium-carbon low-alloy steel Matrix carbon content Lath martensite Carbides Impact toughness |
| url | http://www.sciencedirect.com/science/article/pii/S2238785420312679 |
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