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Influence of the Nitrogen Content on the Carbide Transformation of AISI M42 High-Speed Steels during Annealing
Attempts were made to elucidate the effect of nitrogen on primary eutectic carbides in as-cast and annealed AISI M42 high-speed steel. Particular emphasis was placed on the transformation of carbides during forging and annealing in steels with different nitrogen concentrations and the influence of f...
Autores principales: | , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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Nature Publishing Group UK
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5847578/ https://www.ncbi.nlm.nih.gov/pubmed/29531342 http://dx.doi.org/10.1038/s41598-018-22461-z |
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author | Luo, Yi-Wa Guo, Han-Jie Sun, Xiao-Lin Guo, Jing |
author_facet | Luo, Yi-Wa Guo, Han-Jie Sun, Xiao-Lin Guo, Jing |
author_sort | Luo, Yi-Wa |
collection | PubMed |
description | Attempts were made to elucidate the effect of nitrogen on primary eutectic carbides in as-cast and annealed AISI M42 high-speed steel. Particular emphasis was placed on the transformation of carbides during forging and annealing in steels with different nitrogen concentrations and the influence of final carbides on the impact toughness of the steel. Microstructural observation, electrolytic extraction method, X-ray diffraction analysis, automated inclusion analysis (INCASteel), and impact toughness measurement combined with fractographic observation were conducted on the specimens. Primary M(2)C carbides were found to be dominant precipitates in the as-cast ingot, with a certain amount of V(C,N). Nitrogen addition promoted the formation of fibrous M(2)C, whereas lamellar M(2)C predominated in M42 steel with a low nitrogen concentration (w[N](%) = 0.006). Fibrous carbides M(2)C tend to decompose into more stable carbides M(6)C and MC during forging and annealing compared to lamellar M(2)C. Nitrogen alloying only affected the morphologies and dimensions of carbides, but did not change the types of carbides. These improvements in the dimensions and fractions of carbides naturally increased the impact toughness of annealed steel. Hence, it was suggested that the addition of nitrogen to AISI M42 high-speed steel was required to achieve homogeneous distribution of carbides and sufficient impact toughness. |
format | Online Article Text |
id | pubmed-5847578 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Nature Publishing Group UK |
record_format | MEDLINE/PubMed |
spelling | pubmed-58475782018-03-19 Influence of the Nitrogen Content on the Carbide Transformation of AISI M42 High-Speed Steels during Annealing Luo, Yi-Wa Guo, Han-Jie Sun, Xiao-Lin Guo, Jing Sci Rep Article Attempts were made to elucidate the effect of nitrogen on primary eutectic carbides in as-cast and annealed AISI M42 high-speed steel. Particular emphasis was placed on the transformation of carbides during forging and annealing in steels with different nitrogen concentrations and the influence of final carbides on the impact toughness of the steel. Microstructural observation, electrolytic extraction method, X-ray diffraction analysis, automated inclusion analysis (INCASteel), and impact toughness measurement combined with fractographic observation were conducted on the specimens. Primary M(2)C carbides were found to be dominant precipitates in the as-cast ingot, with a certain amount of V(C,N). Nitrogen addition promoted the formation of fibrous M(2)C, whereas lamellar M(2)C predominated in M42 steel with a low nitrogen concentration (w[N](%) = 0.006). Fibrous carbides M(2)C tend to decompose into more stable carbides M(6)C and MC during forging and annealing compared to lamellar M(2)C. Nitrogen alloying only affected the morphologies and dimensions of carbides, but did not change the types of carbides. These improvements in the dimensions and fractions of carbides naturally increased the impact toughness of annealed steel. Hence, it was suggested that the addition of nitrogen to AISI M42 high-speed steel was required to achieve homogeneous distribution of carbides and sufficient impact toughness. Nature Publishing Group UK 2018-03-12 /pmc/articles/PMC5847578/ /pubmed/29531342 http://dx.doi.org/10.1038/s41598-018-22461-z Text en © The Author(s) 2018 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. |
spellingShingle | Article Luo, Yi-Wa Guo, Han-Jie Sun, Xiao-Lin Guo, Jing Influence of the Nitrogen Content on the Carbide Transformation of AISI M42 High-Speed Steels during Annealing |
title | Influence of the Nitrogen Content on the Carbide Transformation of AISI M42 High-Speed Steels during Annealing |
title_full | Influence of the Nitrogen Content on the Carbide Transformation of AISI M42 High-Speed Steels during Annealing |
title_fullStr | Influence of the Nitrogen Content on the Carbide Transformation of AISI M42 High-Speed Steels during Annealing |
title_full_unstemmed | Influence of the Nitrogen Content on the Carbide Transformation of AISI M42 High-Speed Steels during Annealing |
title_short | Influence of the Nitrogen Content on the Carbide Transformation of AISI M42 High-Speed Steels during Annealing |
title_sort | influence of the nitrogen content on the carbide transformation of aisi m42 high-speed steels during annealing |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5847578/ https://www.ncbi.nlm.nih.gov/pubmed/29531342 http://dx.doi.org/10.1038/s41598-018-22461-z |
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