서지주요정보
2.9니켈-1.1크롬강에서 크립기공과 균열성장의 기구에 관한 연구 = A study of mechanism for the creep cavitation and crack growth of 2/9 Ni-1.1 Cr steel
서명 / 저자 2.9니켈-1.1크롬강에서 크립기공과 균열성장의 기구에 관한 연구 = A study of mechanism for the creep cavitation and crack growth of 2/9 Ni-1.1 Cr steel / 홍성호.
저자명 홍성호 ; Hong, Sung-Ho
발행사항 [서울 : 한국과학기술원, 1985].
Online Access 원문보기 원문인쇄

소장정보

등록번호

4103313

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 8553

SMS전송

도서상태

이용가능

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반납예정일

초록정보

Creep crack growth in 2.9 Ni-1.1 Cr steel has been studied by using compact tension specimens under constant load. Attempts to correlate the crack growth rate $\dot{a}$ with several macroscopic parameter such as stress intensity factor K, effective stress $\sigma_{eff}$ and J-integral, $C^\star$-integral have been made under different testing condition. The $C^\star$-integral has been found to be the most correlating load parameter. Experimental data indicate that minor differences in microstructure do not significantly influence $\dot{a}$ versus $C^\star$ curve. Also, in the range of 500℃ to 600℃, the $\dot{a}$ versus $C^\star$ curve is not significantly affected by temperature. The implications of these results are discussed and applied to current models which describe the relationship between the crack growth rate and macroscopic load parameter $C^\star$ under different cavitation mechanism. Results show that creep crack growth in 2.9 Ni-1.1 Cr steel is quantitatively described by a model based on creep constrained cavitation of grain boundaries ahead of the crack tip. Microscopic observation of crack tip region by SEM revealed the presence of near-coalesced grain boundary cavities, which is consistent with the well known theory that the macroscopic crack advances by the linkage of coalesced cavities with the main crack. Damage profile indicates that the cavities area fraction, the cavities radius and the fully coalesence zone size ahead of the crack tip tend to decrease as $C^\star$-integral increase. The cavity size of the Rc 35 specimen was found to be smaller than the Rc 25 specimen, the result of which is analyzed in terms of the stresses near the crack tip.

서지기타정보

서지기타정보
청구기호 {MMS 8553
형태사항 [iv], 62 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Sung-Ho Hong
지도교수의 한글표기 : 남수우
공동교수의 한글표기 : 유진
지도교수의 영문표기 : Soo-Woo Nam
공동교수의 영문표기 : Jin Yu
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 32-35
주제 Creep.
Porosity.
Chrome-nickel steel.
기공 (주조) --과학기술용어시소러스
균열 전파. --과학기술용어시소러스
적분. --과학기술용어시소러스
S-integral.
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