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EFFECT OF NEGATIVE OVERLOAD ON FATIGUE-CREEP INTERACTION FOR A Ni-BASE ALLOY |
ZHANG Jishan Institute of Metal Ressarch;Academia Sinica;shenyang;YANG Wangyue;CHEN Guoliang;GENG Qingquan;HUANG Linji Beijing Institute of Iron and Steel Technology; Fushun Steel Works; Xindu Mechine Plant |
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Cite this article:
ZHANG Jishan Institute of Metal Ressarch;Academia Sinica;shenyang;YANG Wangyue;CHEN Guoliang;GENG Qingquan;HUANG Linji Beijing Institute of Iron and Steel Technology; Fushun Steel Works; Xindu Mechine Plant. EFFECT OF NEGATIVE OVERLOAD ON FATIGUE-CREEP INTERACTION FOR A Ni-BASE ALLOY. Acta Metall Sin, 1988, 24(2): 119-125.
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Abstract The effect of negative overload (S_p) on fatigue-creep interaction forNi-base sup eralloy GH698 has been studied at 700℃. It was found that thiseffect depends on the magnitude of S_p The cyclic fracture lives for the tests withS_p of 0 to-400 MPa are longer than those without S_p, but this effect shall be ne-gative while the S_p value was higher or lower. The changing tendency of dynamiccreep rate exhibits an inverse character. It was considered that the mechanisms ofS_p effect are as follows: 1. it reduces the dynamic creep rate, 2. it promotes thefatigue damage and causes the change of fracture mode, 3. it retards the crack pro-pagation and 4. it cause the fatigue damage due to the S_p cycles itself. How thesefactors work depends. on the magnitude of stress of basic and S_p cycles.
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Received: 18 February 1988
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1 陈国良,航空材料,1983;(3) :47 2 何庆复,博士论文,北京钢铁学院,1985 3 Chen G L, He Q F, Gao L, Xie X S, et al. In: Mcqueen H J. BaiIon F P et al. eds., strength of Metals and Alloys, Canada: Pergaman, 1985: B61 4 Chen G L. in press 5 Chen G L. in press 6 欧阳杰,颜鸣皋,金属学报,1982;18:38 7 Wheeler O E. Trans ASME, Ser D: J Basic Eng, 1972; 94: 181 8 Willenborg J D, Engle R M, Wood H A. AFFDL-TM 71-1-FBR, 1971 9 Maarse J. In: Taplin D M R ed., Fracture 1977, Waterloo, Canada: University of Waterloo Press,1977: 1025 10 Matsuoka S, Tanaka K. Eng Fract Mech, 1978; 10: 515 |
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