铸造镍基高温合金M963的高温低周疲劳行为

HUANG Zhiwei1) , YUAN Fuhe2) , WANG Zhongguang2) , ZHU Shijie2 3) , WANG Fugang1)
ABSTRACT Low cycle fatigue tests for cast nickel base superalloy M963 have been conducted at 900 in air under fully reversed total strain control cycling at strain rates of 4 10;3 s;1 and 1 10;4 s;1 . The experimental results showed that at the same strain amplitude, fatigue life at low strain rate was shorter than that at high strain rate, which is attributed to time dependent damage mechanism such as oxidation. SEM observation revealed that the cracks initiated at the surface{connected carbides and/or casting micropores at subsurface. When the strain rate was lower, some of the cracks tended to initiate at interdendritic regions and then propagate along interdendritic regions. In all tests, the cracking mode was transgranular. KEY WORDS Ni base superalloy, high temperature low cycle fatigue, strain rate, cracking
Manuscript received 2007{11{09, in revised form 2007{02{10 1) School of Materials Science and Engineering, Dalian University of Technology, Dalian 116023 2) Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 3) Department of Intelligent Mechanical Engineering, Fukuoka Institute of Technology, Fukuoka, Japan
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ACTA METALLURGICA SINICA
Vol.43 No.7 July 2007 pp.678{682
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Correspondent: WANG Zhongguang, professor, Tel: (024)83978870, E-mail: zhgwang@ Supported by the Center for Interfacial Materials, Shenyang Natimal Laboratory for Materials Science, CAS, CIM09SJZHU