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Microstructure and Mechanical Properties of Heat-Treated High-Nitrogen Martensitic Stainless Steel

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Abstract

The high-nitrogen martensitic stainless steel (HNMS) was subjected to three different austenitizing cycles of 1050, 1075, and 1100 °C followed by sub-zero treatment at − 70 °C. The fraction of retained austenite has been reduced after sub-zero treatment as revealed by microstructural evolution. The material was subsequently tempered at different temperatures ranging from 180 to 650 °C and the change in micro-structure, hardness, tensile strength, and toughness were investigated after each heat treatment cycle. Optical microscopy, electron microscopy with EDS, and x-ray diffraction techniques were used to characterize the material. This has showed the constituents of microstructure were lath martensite, precipitated metal carbides of type M23C6, M7C6, and carbonitrides. Hardness, tensile testing, and Charpy impact testing were carried out to evaluate mechanical properties after the heat treatment which has showed the better mechanical properties for the samples solutionized at 1075 °C. Secondary hardening has been observed on tempering above 450 °C which can be attributed to the precipitation of secondary phase intermetallic compounds. Hardness attains a peak value at a peculiar temperature range after which it decreases on further tempering which is most likely because of the loss of coherency of the precipitates with the metal matrix. This has been further confirmed by the XRD of the specimens before and after tempering. The study establishes the structure-property correlation of HNMS for different heat treatment cycles. The results indicate that a good combination of hardness and strength can be achieved after solutionizing at 1075 °C followed by double tempering (DT) at 525 °C.

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Acknowledgements

HSD expresses gratitude to his colleagues at Aerospace Materials Laboratory (AML), LPSC/ISRO, for their valuable assistance in characterization. The support provided by IIST, VSSC, and LPSC is sincerely acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, IISc, Bangalore, India

    Harish Singh Dhami

  2. Liquid Propulsion System Center (LPSC)/ISRO, Thiruvananthapuram, India

    Nellori Dileep Kumar & Thomas Tharian

  3. Indian Institute of Space Science and Technology, Thiruvananthapuram, India

    P. Chakravarthy

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  1. Harish Singh Dhami
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  2. Nellori Dileep Kumar
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Correspondence to Harish Singh Dhami or P. Chakravarthy.

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Dhami, H.S., Kumar, N.D., Tharian, T. et al. Microstructure and Mechanical Properties of Heat-Treated High-Nitrogen Martensitic Stainless Steel. Metallogr. Microstruct. Anal. 13, 96–105 (2024). https://doi.org/10.1007/s13632-024-01041-w

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