Journal of the Korean Society for Heat Treatment (열처리공학회지)

The Korean Society for Heat Treatment (한국열처리공학회)
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Effects of Long-term Heat treatment on Mechanical Softening of Mn-Mo-Ni Low-Alloy Steel

Mn-Mo-Ni 저합금강의 기계적 연화에 미치는 장시간 열처리 영향

  • Kim, Minsuk (Department of Materials Science and Engineering, Chosun University) ;
  • Kim, Chungseok (Department of Materials Science and Engineering, Chosun University)
  • 김민석 (조선대학교 신소재공학과) ;
  • 김정석 (조선대학교 신소재공학과)
  • Received : 2021.10.19
  • Accepted : 2021.10.29
  • Published : 2021.11.30
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Abstract

In the present study, we investigate the effects of long-term heat treatment at elevated temperatures on the mechanical softening of the Mn-Mo-Ni low-alloy steel. The influence of long-term heat treatment on microstructure and mechanical strength was evaluated. To simulate the long-term material degradation, heat treatment test was interrupted at several stages up to 10,000 hours in an electric furnace. The Mn-Mo-Ni low-alloy steel shows a typical bainitic phase, which consists of a well-developed lath substructure with fine precipitates along the lath boundaries. However, these fine precipitates were redissolved into the matrix with long-term heat treatment, and then the lath substructures were recovered. Consequently, ultimate tensile strength and yield strength decreased during long-term heat treatment showing a mechanical softening phenomenon.

Keywords

Acknowledgement

이 논문은 2019년도 조선대학교 연구지원금의 지원을 받아 연구되었음

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