Korean Journal of Metals and Materials (대한금속재료학회지)

The Korean Institute of Metals and Materials (대한금속재료학회)
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Effect of Reverse Transformation on the Mechanical Properties of High Manganease Austenitic Stainless Steel

고 Mn 오스테나이트계 스테인리스강의 기계적 성질에 미치는 역변태의 영향

  • Kang, C.Y. (Dept. of Metallurgical Engineering, Pukyong National University) ;
  • Hur, T.Y. (Dept. of Metallurgical Engineering, Pukyong National University)
  • 강창룡 (부경대학교 금속공학과) ;
  • 허태영 (부경대학교 금속공학과)
  • Received : 2012.02.22
  • Published : 2012.06.25
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Abstract

This study was carried out to investigate the effect of reverse transformation on the mechanical properties in high manganese austenitic stainless steel. Over 95% of the austenite was transformed to deformation-induced martensite by 70% cold rolling. Reverse transformation became rapid above an annealing temperature of $550^{\circ}C$, but there was no significant transformation above $700^{\circ}C$. In addition, with an increasing annealing time at $700^{\circ}C$, reverse transformation was induced rapidly, but the transformation was almost completed at 10 min. There was a rapid decrese in strength and hardness with annealing at temperature above $550^{\circ}C$, while elongation increased rapidly above $600^{\circ}C$. At $700^{\circ}C$, hardness and strength decreased rapidly, and elongation increased steeply with an increasing reverse treatment time up to 10 min, whereas there were no significant change with a treatment time after 10 min. The reverse-transformed austenite showed an ultra-fine grain size less than $0.2{\mu}m$, which made it possible to strengthen the high manganese austenitic stainless steel.

Keywords

Acknowledgement

Supported by : 부경대학교

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