GUO Shouren LU Dezhong GUO Jianting Institute of Metal Research
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Academia
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Shenyang
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ChinaWU Xi Fushun Steel Works
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Fushun
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China Associate Professor
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Institute of Metal Research
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Academia Sinica
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Shenyang 110015
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China
金属学报(英文版)
The mechanical properties and microstructure of an Fe-base superalloy GH35A have been examined after aging at 650—750℃ for 100—10000 h.The tensile strength of the alloy changes no more with aging temperature and the time at room temperature,but the ductility and impact toughness at room temperature,as well as the stress-rupture life up to 700℃ de- crease slowly during aging up to 10000 h The initiation time to worsen its properties becomes shorter as the aging temperature rises.The variation of the mechanical properties of the alloy was found mainly depending on the formation,morphology,distribution and characteristic of the σ-phase precipitation.
关键词:
superalloy
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CHEN Liangshi
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GAO Xuejie
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FENG Tao
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LIU Minzhi Corrosion Science Laboratory
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Institute of Corrosion and Protection of Metals
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Academia
,
Sinica Shenyang
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China
金属学报(英文版)
Corrosion fatigue under the load of low frequency and bigh mean stress has been generally defined as stress corrosion fatigue(SCF).It is a specific failure process due to the inter- action between stress corrosion cracking(SCC) and corrsion fatigue(CF),the effects of which on fracture characteristics,including crack initiation and propagation.service life and cracking mode have not been investigated systematically.The purpose of this pa- per was to study the environment-sensitive fracture behaviour of OCr18Ni9Ti austenitic stainless steel under the load of different fiequencies and high mean stress in boiling MgCl_2 solution.The interaction between SCC and CF would be emphasized.
关键词:
stress corrosion eracking
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