Age-Hardening Behavior in High-Nitrogen Stable Austenitic Stainless Steel

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  • Masumura Takuro
    Department of Materials, Kyushu University International Institute for Carbon-Neutral Energy Research, Kyushu University
  • Honda Tatsuya
    Graduate School of Engineering, Kyushu University
  • Naridomi Kosuke
    Graduate School of Engineering, Kyushu University
  • Uranaka Shohei
    Graduate School of Engineering, Kyushu University
  • Tsuchiyama Toshihiro
    Department of Materials, Kyushu University International Institute for Carbon-Neutral Energy Research, Kyushu University Research Center for Steel, Kyushu University
  • Miyamoto Goro
    Institute for Materials Research, Tohoku University
  • Yamasaki Shota
    R&D Center, Nippon Steel Stainless Steel Corporation

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説明

<p>Age hardening in stable austenitic stainless steel wires with a chemical composition of Fe–18%Cr–12%Ni and different N contents was investigated to clarify the role of N. Age hardening could be enhanced by increasing the drawing ratio and N content. The highest age-hardening effect was observed at 800 K in the N-bearing specimens. In addition, severe drawing induced low-temperature age hardening at 450–600 K. Differential scanning calorimetry (DSC) analysis revealed that age hardening at 800 K may be attributed to particle dispersion strengthening by Cr2N. Meanwhile, the exothermic peaks observed at 450–600 K were controlled by the pipe diffusion of N. However, nitride precipitates and clusters could not be detected by 3D atom probe analysis, which implies the formation of atomic-scale N products, such as I-S pairs, at the dislocations.</p><p> </p><p>This Paper was Originally Published in Japanese in J. Jpn. Soc. Heat Treat. 61 (2021) 112–118. Result and Discussion are slightly modified.</p>

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  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 63 (2), 163-169, 2022-02-01

    公益社団法人 日本金属学会

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