서지주요정보
12% 크롬강의 고온 저주파 피로수명에 미치는 유지시간의 영향 = The effect of hold time on the high temperature low cycle fatigue life in 12%Cr steel
서명 / 저자 12% 크롬강의 고온 저주파 피로수명에 미치는 유지시간의 영향 = The effect of hold time on the high temperature low cycle fatigue life in 12%Cr steel / 공병욱.
저자명 공병욱 ; Kong, Byeong-Ook
발행사항 [대전 : 한국과학기술원, 1990].
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소장정보

등록번호

8001325

소장위치/청구기호

학술문화관(문화관) 보존서고

MMS 9001

휴대폰 전송

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초록정보

Effect of hold time on low cycle fatigue behavior of 12%Cr rotor steel at 873K was studied in air. Total strain amplitude was controlled to be 1, 1.5, 2, and 2.5% with zero mean strain. In order to investigate the effect of creep-fatigue interaction, hold time of 10 min. at tensile, tensile-compressive, and compressive peak strain was added. The experimental results show that the life of hold time fatigue is shorter than that of continuous cycling. For all the tests except tensile hold time fatigue, the transgranular mode fracture was observed and no grain boundary creep cavites were shown. In the case of tensile hold time fatigue mixed mode (inter and transgranular) fracture was observed and creep cavities were shown. at grain boundaries and lath martensite boundaries. But, regardless of hold mode, the hold time decreased the fatigue endurance. From the experimental results, the decrease in the fatigue life with hold time can be explained as follows : Oxidation during hold time decreases the number of cycles for crack initiation. Since the recovery during hold time reduces the flow stress, the crack tip opening displacement is enlarged. By that way, the crack growth rate is increased. Regardless of hold mode, two effects mentioned above reduced the fatigue life. Moreover, in the case of tensile hold time fatigue, since the fatigue crack interacts with cavities, the fatigue life is significantly decreased.

서지기타정보

서지기타정보
청구기호 {MMS 9001
형태사항 [iv], 70 p. : 삽도, 사진 ; 26 cm
언어 한국어
일반주기 저자명의 영문표기 : Byeong-Ook Kong
지도교수의 한글표기 : 남수우
지도교수의 영문표기 : Soo-Woo Nam
학위논문 학위논문(석사) - 한국과학기술원 : 재료공학과,
서지주기 참고문헌 : p. 66-70
주제 Fatigue.
Creep.
Metals at high temperatures.
고온 피로. --과학기술용어시소러스
크리프-피로 상호작용. --과학기술용어시소러스
피로 균열. --과학기술용어시소러스
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