서지주요정보
Zr-2.5wt%Nb 합금에서 수화물에 의한 지체 균열 전파 거동에 대한 연구 = A study on delayed hydride cracking behavior in Zr-2.5wt%Nb alloys
서명 / 저자 Zr-2.5wt%Nb 합금에서 수화물에 의한 지체 균열 전파 거동에 대한 연구 = A study on delayed hydride cracking behavior in Zr-2.5wt%Nb alloys / 박준상.
저자명 박준상 ; Park, Jun-Sang
발행사항 [서울 : 한국과학기술원, 1989].
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소장정보

등록번호

4105932

소장위치/청구기호

학술문화관(문화관) 보존서고

MNE 8909

SMS전송

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초록정보

Effects of the size and distribution of hydrides on delayed hydride cracking (DHC) in Zr - 2.5 wt%Nb pressure tube material was studied by static load test and fractographic examinations. Crack velocities were measured in hydrided specimens that were cooled by ice-water quenching and furnace cooling from solution heat treatment temperature. Fractographic features after delayed hydride cracking were examined with use of scanning electron microscope (SEM) and transmission electron microscope (TEM) as a function of stress intensity factor (K) and the size and distribution of hydrides. Crack velocities in specimens with finely dispersed hydrides increased but were essentially independent of applied stress intensity factor. The incubation period before cracking commences and activation energy for crack growth decreased in specimens with finely dispersed hydrides. The size and distribution of hydrides did not influence fracture morphology significantly. The inter-striation spacing was independent of stress intensity factor in specimen with fine hydride. The results can be explained on the basis of Simpson - Puls model that is applicable for specimens with the distribution of coarse hydrides. Effects of preexisting hydrides around crack - tip and hydride phase associated with different cooling rate from solution heat treatment temperature, however, must be considered to explain the reduction of incubation time and activation energy for crack growth.

서지기타정보

서지기타정보
청구기호 {MNE 8909
형태사항 [iv], 54 p. : 삽도 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Jun-Sang Park
지도교수의 한글표기 : 윤용구
지도교수의 영문표기 : Young-Ku Yoon
학위논문 학위논문(석사) - 한국과학기술원 : 핵공학과,
서지주기 참고문헌 : p. 29-32
주제 Zirconium alloys.
Cracking process.
지르코늄 합금. --과학기술용어시소러스
수화물. --과학기술용어시소러스
균열 전파. --과학기술용어시소러스
Hydrides.
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