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- Title
Significance of Partial Substitution of Carbon by Nitrogen on Strengthening and Toughening Mechanisms of High Nitrogen Fe-15Cr-1Mo-C-N Martensitic Stainless Steels.
- Authors
Feng, Hao; Li, Hua-Bing; Jiao, Wei-Chao; Jiang, Zhou-Hua; Cai, Ming-Hui; Zhu, Hong-Chun; Chen, Zhi-Gang
- Abstract
We elucidated the significance of partial substitution of C by N in three high nitrogen Fe-15Cr-1Mo-C-N martensitic stainless steels (MSSs), and particularly its influence on microstructural features and the strength-toughness balance. The results show that partial substitution of C by N avoided the formation of coarse intergranular carbides and caused significant changes in the type of carbonitrides from M23C6 to M23C6+M2N and finally to M2N. Meanwhile, partially replacing C by N first increased and then decreased the effective grain size, the fraction of retained austenite, and the plate martensite, while the variations of the amount of carbonitrides and dislocation density were just the opposite. The microstructural evolutions with varying (C+N) contents played a crucial role in determining the overall properties: the 0.35C-0.37N steel exhibited an improved impact toughness (~ 86.1 J), which was 2 or 3 times higher than those of 0.50C-0.16N and 0.20C-0.54N steels, even at a strength level of over 2 GPa. The contributions of partial substitution of C by N on the strengthening mechanisms of MSSs were also systematically revealed by combining the experimental and theoretical data.
- Subjects
MARTENSITIC stainless steel; DISLOCATION density; NITROGEN; MARTENSITE; GRAIN size; STAINLESS steel
- Publication
Metallurgical & Materials Transactions. Part A, 2019, Vol 50, Issue 11, p4987
- ISSN
1073-5623
- Publication type
Article
- DOI
10.1007/s11661-019-05398-4