STS 410 마르텐사이트계 Stainless 강의 템퍼취성과 조직 및 기계적 성질에 관한 연구 (The Effects of the Structural Changes and Mechanical Properties of the Austenitized and Tempered Martensitic STS 410 Stainless Steel on Its Temper Embrittlement)

서지정보

· 발행기관 : 한국열처리공학회
· 수록지 정보 : 열처리공학회지 / 35권 / 6호 / 303 ~ 313페이지
· 저자명 : 이승희, 고태호, 이원식, 김승대

초록

The purpose of this study was to test and analyze the effects of the mechanical properties and struc­ tural changes of the austenitized and tempered martensite STS 410 stainless steel containing 11.5~13%Cr and 0.10%C on its temper embrittlement. The STS 410 stainless steel test pieces for each 3 hours at 960°C, 1000°C and then, tempered them for 2 hours at 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, 600°C, 650°C and 700°C known as the intervals vulnerable to temper embrittlement to observe the changes of their structures and mechanical properties. In case autenitizing was insufficient due to lower temperature of thermal treatment for solution, unsolved carbides and ferrites remained in the structure after quenching, which meant that the parts could wear out and corrode to embrittle at the room temperature. Elongation and impact energy changes with Tempering conditions showed minimum results in range of 400~500°C. The decrease in elongation and impact energy at 400~500°C was the hardening effect of the subgrain due to the precipitation of many M3C or M7C3, M23C6. And STS 410 stainless steel corrosion tested in 10% NaCI solution at 30°C after tempering treatment. The degree of corrosion sensitization showed increasing tendency with increase of tempering temperature and Cr car­ bide precipitation were observed in grain boundary.

영어초록

The purpose of this study was to test and analyze the effects of the mechanical properties and struc­ tural changes of the austenitized and tempered martensite STS 410 stainless steel containing 11.5~13%Cr and 0.10%C on its temper embrittlement. The STS 410 stainless steel test pieces for each 3 hours at 960°C, 1000°C and then, tempered them for 2 hours at 300°C, 350°C, 400°C, 450°C, 500°C, 550°C, 600°C, 650°C and 700°C known as the intervals vulnerable to temper embrittlement to observe the changes of their structures and mechanical properties. In case autenitizing was insufficient due to lower temperature of thermal treatment for solution, unsolved carbides and ferrites remained in the structure after quenching, which meant that the parts could wear out and corrode to embrittle at the room temperature. Elongation and impact energy changes with Tempering conditions showed minimum results in range of 400~500°C. The decrease in elongation and impact energy at 400~500°C was the hardening effect of the subgrain due to the precipitation of many M3C or M7C3, M23C6. And STS 410 stainless steel corrosion tested in 10% NaCI solution at 30°C after tempering treatment. The degree of corrosion sensitization showed increasing tendency with increase of tempering temperature and Cr car­ bide precipitation were observed in grain boundary.

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