서지주요정보
Nb 미량 첨가 고장력 저합금강의 Delamination 현상에 관한 연구 = A study on the occurrence of delamination in Nb-microalloyed HSLA steel
서명 / 저자 Nb 미량 첨가 고장력 저합금강의 Delamination 현상에 관한 연구 = A study on the occurrence of delamination in Nb-microalloyed HSLA steel / 도정만.
저자명 도정만 ; Do, Jung-Man
발행사항 [서울 : 한국과학기술원, 1985].
Online Access 제한공개(로그인 후 원문보기 가능)원문

소장정보

등록번호

4103300

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 8510

SMS전송

도서상태

이용가능

대출가능

반납예정일

초록정보

Effect of prior rolling and thermal process on the occurrence of delamination in the tensile test and Charpy V-notch impact test specimens of Nb-microalloyed HSLA steel studied. Four different rolling and thermal process were carried out; hot rolled-quenched, hot rolled-air cooled, hot rolled-quenched-cold rolled, and hot rolled-air cooled cold rolled. the samples were aged at 600℃ for different period of times before tensile or impact test. The occurrence of the delamination was be depended on the fabrication process, aging time, and test temperature. In the case of tensile specimens, the delamination occurred only in the hot rolled-quenched-cold rolled samples. In the case the delamination was initiated and propagated along grain boundaries. The susceptibility for the delamination at the grain boundaries is attributed to the elongated grains in the direction of cold rolling, to the precipitated carbides by aging treatment, and also to the nonmetallic inclusions such as MnS and $Al_2O_3$, at the boundaries. In the initial stage of aging treatment, delamination increased with the increased amounts of crabides on the grain boundaries. The degree of delamination reached to a maximum value and then the decrease of delamination by increasing the aging time. The decrease of delamination can be interpreted as the result of the generation equiaxed grains by recrystallization and resulting the original carbides at grain boundaries to locate inside the new grains. In the case of CVN impact test specimens, the delamination occurred in the hot rolled-quenched-cold rolled and hot rolled-air cooled-cold rolled samples. The fracture surface has shown transgranular brittle fracture mode. By decreasing test temperature, the degree of delamination increased to a maximum value and then decreased rapidly. The temperature corresponding to the maximum degree of delamination was around the transition temperature range. With the increased of aging time, the degree of delamination of hot rolled-quenched-cold rolled samples decreased, however that of the hot rolled-air cooled-cold rolled samples kept a constant value after some decrease at the initial stage.

서지기타정보

서지기타정보
청구기호 {MMS 8510
형태사항 [v], 57 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jung-Man Do
지도교수의 한글표기 : 허성강
지도교수의 영문표기 : Sung-Kang Hur
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 55-57
주제 Aging.
Recrystallization (Metallurgy)
Composite materials --Delamination.
첨가물 효과. --과학기술용어시소러스
고장력강. --과학기술용어시소러스
충격 시험. --과학기술용어시소러스
시효 처리. --과학기술용어시소러스
Impact tests.
QR CODE qr code