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肖磊,朱晓闽,张高翔,王冲.粉末高温合金FGH97疲劳裂纹扩展行为的研究[J].稀有金属材料与工程(英文),2019,48(5):1623~1630.[Xiao Lei,Zhu Xiaomin,Zhang Gaoxiang and Wang Chong.Study on Fatigue Crack Growth Behavior of FGH97 P/M Superalloy[J].Rare Metal Materials and Engineering,2019,48(5):1623~1630.]
Study on Fatigue Crack Growth Behavior of FGH97 P/M Superalloy
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Received:March 26, 2018  Revised:May 02, 2018
Key words: FGH97 P/M superalloy  argon atomization process  plasma rotating electrode process  fatigue crack growth
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Xiao Lei,Zhu Xiaomin,Zhang Gaoxiang and Wang Chong  
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      Fatigue crack growth behavior at 650℃ of a P/M superalloy FGH97, which was made by Argon Atomization (AA) + Hot Isostatic Pressing (HIP)process, was investigated. Comparison tests were conducted using a Russian EP741NP disk made of Plasma Rotating Electrode Process (PREP) + HIP process. The effects of different powder making methods, oxygen content, grain size and gamma prime size on the fatigue crack growth rate were evaluated. The results revealed that the fatigue crack growth behavior of AA + HIP processed FGH97 test disk has a lower crack growth rate compared with EP741NP disk, and disks with larger grain size, larger gamma prime size have lower crack growth rates, the oxygen content between 100~150 ppm range has no significant effect on the crack growth rate.