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J. Ocean Eng. Technol. 1992;6(1):78-86.    

A Study on the Effect of Initial Strain on Cyclic Creep Properties of Steam Turbine Rotor Steel
화력 발전용 로터강의 초기 변형율이 CYCLIC 크리프 특성에 미치는 영향에 관한 연구
오세규,정순억,한상덕
부산수산대학교 기계공학과,부산수산대학교 기계공학과,통영수산전문대학 기관학과
© 1992 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Keywords: Transition Creep Region, Steady State Creep Rate, Initial Strain, Elastic Strain, Anelastic Strain
핵심용어: 천이 크리프 영역, 정상 크리프 속도, 초기변형율, 탄성 변형율, 의탄성 변형율
Abstract
The creep behaviors of 1%Cr-Mo-V and 12%Cr steam turbine rotor steels under static or cyclic load were examined at 600 and $700^{circ}C$. The relationship between these two kinds of phenomena was studied and the experimental results were summarized as follows: 1) It is confirmed that the cyclic creep strain dependent on time is more available for creep, behavior analysis according to frequency change than that dependent on number of cycles, and the static creep, the special case of cyclic creep with stress ratio of 1 can be also more effectively analyzed by time-dependence. 2) The steady cyclic creep rate vs. the steady static creep rate, increases according to the increase of stress ratio, and this phenomena may occur on occasion of the decrease of the internal stress. 3) The initial strain affects on all the creep properties of the transient region, the steady state region and the rupture time in cyclic creep as well as static creep, and the quantitative relationships among them exist.


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