Journal of Power System Engineering (동력기계공학회지)

The Korean Society for Power System Engineering (한국동력기계공학회)
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Effect of Solution Annealing on the Microstructure and Mechanical Properties of Modified 440A Martensitic Stainless Steel

Mod. 440A 마르텐사이트 스테인리스강의 미세조직과 기계적 성질에 미치는 오스테나이트화 처리의 영향

  • Kim, Young-Chul (Department of Metallurgical Engineering, Pukyong National University) ;
  • Kwon, Soon-Doo (Department of Metallurgical Engineering, Pukyong National University) ;
  • Jung, Byong-Ho (Department of Metallurgical Engineering, Pukyong National University) ;
  • Kang, Chang-Yong (Department of Metallurgical Engineering, Pukyong National University)
  • Received : 2013.04.12
  • Accepted : 2013.06.10
  • Published : 2013.08.31
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Abstract

This study was investigated the effect of austenitizing treatment the microstructure and mechanical properties in modified 440A steel, and the results were as follows. The amount of remaining carbide decreases with increasing the austenitizing treatment temperature, and all carbide is completely dissolved at $1250^{\circ}C$. The amount of remaining carbide decreases with increasing the austenitizing treatment time, but the carbide remains insoluble up to 120 minutes at $1050^{\circ}C$. The strength and hardness gradually decrease with increasing the austenitizing treatment temperature and is significantly lower at $1250^{\circ}C$, while the elongation and the impact value rapidly increase. The strength and hardness rapidly decrease, the elongation and impact value rapidly insrease with increasing the austenitizing treatment time and exhibit no change at above 120 minutes. The austenitizing treatment modified 440A steel is required for temperature of above $1050^{\circ}C$ and time of above 60 minutes.

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References

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