발간논문

Home > KJMM 논문 > 발간논문

Vol.29, No.6, 545 ~ 554, 1991
Title
Local Brittle Zone of HSLA Steels (2) ( Fracture Mechanism and Fracture model )
김병천Byung Chun Kim, 이성학Sung Hak Lee, 이두영Doo Young Lee, 김낙준Nack J . Kim
Abstract
This study is concerned with a correlation between microstructure and plane strain fracture toughness in heat affected zones of high-strength low alloy (HSLA) steels, i.e., a normalized steel and a TMCP steel. The micromechanism of fracture processes involved in void and microcrack formation is identified and quantified. The fracture toughness results were also interpreted using simple fracture initiation models based on the basic assumption that crack initiates at a certain critical strain or stress developed over some microstructurally significant distance. The calculated K_IC values are found to scale roughly with the square root of the spacing of the stringer type martensite islands, confirming that martensite islands play an important role in reducing the toughness of the coarse grained HAZ. These foundings suggest that the LBZ in the HSLA steels studied can be explained quantitatively using different fracture models.
Key Words
| PDF
대한금속∙재료학회 │ (06633) 서울시 서초구 서초대로 56길 38 대한금속∙재료학회 회관 (서초1동 1666-12번지)
Tel : 070-4266-1646 │ FAX : 02-557-1080 │ E-mail : metal@kim.or.kr
Copyright ⓒ 2013 사단법인 대한금속∙재료학회 All rights reserved.