고주파 열처리된 0.2wt.%C-Cr 선조질강의 피로 특성에 관한 연구

• 영문명: A Study on the Fatigue Properties of the Pre Heat-Treated 0.2wt.%C-Cr Steel by Induction Heating
• 발행기관: 한국산업기술융합학회(구. 산업기술교육훈련학회)
• 저자명: 김용준(Yong-Jun Kim)
• 간행물 정보: 『산업기술연구논문지』산업기술교육훈련논문지 제16권 4호, 113~118쪽, 전체 6쪽
• 주제분류: 공학 > 산업공학
• 파일형태: PDF
• 발행일자: 2011.12.30

영문 초록

The material studied in this paper that is an alloy of 0.2 percent carbon and a few Cr was heat-treated by high frequency induction coil. The heat treatment processes is quenching and tempering at about 980℃ and 510℃ for 15 second respectively. During the heat treatment, the carbides were precipitated in the tempered martensite matrix. As a result, high tensile and yield strength was achieved because of small Cr carbide precipitates. Also at room temperature, high cycle fatigue(HCF) test carried out for this steel at 20Hz and R=0.1. The mechanism of fatigue crack initiation from surface and propagation to subsurface was investigated. A few large precipitate with a size lower than the critical threshold leads to a surface initiation crack. It seems that fine microstructure and carbides improve resistance to crack propagation.

목차

Ⅰ. 서 론

Ⅱ. 실 험

Ⅲ. 실험결과 및 고찰

Ⅴ. 결 론

키워드

Pre Heat-Treated Steel(선조질강) Fatigue(피로) Fatigue Fracture(피로 파괴) Fractography(파면 분석)