The stability of austenite in tensile deformation and its relation to a nitriding treatment in precipitation hardened stainless steel

Akira Ichikawa, Masatoshi Aramaki, Osamu Furukimi

研究成果: 著書/レポートタイプへの貢献会議での発言

抜粋

Two kinds of specimens of 17Cr-4.5Ni precipitation-hardened stainless steel were examined; one was treated in an ammonia decomposition gas atmosphere (nitriding gas) at 1338K for 0.6ks, and another one was no-nitriding. Tensile tests were performed using the above-mentioned specimens. The amount of austenite phase of specimens at various strain rates was quantified by means of X-ray diffraction. Although the specimen treated in nitriding gas exhibits about 50% strain in the tensile test, it does not show transformation-induced plasticity (TRIP) phenomenon. In contrast, the no-nitriding specimen, against the strain caused TRIP. Nitrogen gas in nitriding treatment increases the amount of nitrogen up to 0.03mass%. Most of the nitrogen was found to exist as solute atoms in the specimen. The specimen without TRIP exhibits a tensile strength of 1080MPa and an elongation of 49%. On the other hand, the no-nitriding specimen exhibits a tensile strength of 1170MPa and an elongation of 27%. Therefore, the former showed much higher deformation energy than the latter. This investigation provides evidence that the austenite phase of precipitation-hardened stainless steel is stabilized by nitrogen that is an austenite former, so martensite transformation is inhibited, and thus deformation energy increased.

元の言語英語
ホスト出版物のタイトルProceedings of the 17th IFHTSE Congress
出版者The Japan Society for Heat Treatment (JSHT)
ページ506-509
ページ数4
2
ISBN(電子版)9780000000002
出版物ステータス出版済み - 2008
イベント17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008 - Kobe, 日本
継続期間: 10 26 200810 28 2008

その他

その他17th International Federation for Heat Treatment and Surface Engineering Congress 2008, IFHTSE 2008
日本
Kobe
期間10/26/0810/28/08

    フィンガープリント

All Science Journal Classification (ASJC) codes

  • Surfaces, Coatings and Films
  • Condensed Matter Physics
  • Mechanics of Materials

これを引用

Ichikawa, A., Aramaki, M., & Furukimi, O. (2008). The stability of austenite in tensile deformation and its relation to a nitriding treatment in precipitation hardened stainless steel. : Proceedings of the 17th IFHTSE Congress (巻 2, pp. 506-509). The Japan Society for Heat Treatment (JSHT).