Abstract
The microstructure and properties of a nitrogen-alloyed martensitic stainless steel in different heat treatment conditions were investigated in the present work. Hardness, compressive strength and microstructure were evaluated in the different heat treatment conditions, viz. hardening, cryo treatment and tempering. In the hardened condition, the microstructure consists of lath martensite, retained austenite, M23C6 carbides and MX-type carbonitrides. The typical compressive yield strength (CYS) and hardness in hardened condition were 1835 MPa and 610 VHN, respectively. After cryo treatment at −80 °C and tempering (500 °C), the hardness and CYS increased to 1936 MPa and 686 VHN, respectively. The increase in CYS and hardness is attributed to the formation of fine Mo2C and Cr2N particles.
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The authors would like to thank their colleagues at Material Characterization Division (VSSC) for their support in mechanical testing of the samples. The authors would like to express sincere gratitude to the Director, VSSC for his kind permission to publish this work.
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Krishna, S.C., Karthick, N.K., Jha, A.K. et al. Microstructure and Properties of Nitrogen-Alloyed Martensitic Stainless Steel. Metallogr. Microstruct. Anal. 6, 425–432 (2017). https://doi.org/10.1007/s13632-017-0381-6
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DOI: https://doi.org/10.1007/s13632-017-0381-6