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杨金龙,朱晓闽,熊江英,陈祺,郭建政.夹杂物尺寸及分布对FGH97高温合金低周疲劳性能的影响[J].稀有金属材料与工程(英文),2020,49(5):1614~1622.[yangjinlong,zhuxiaomin,xiongjiangying,chenqi and guojianzheng.Effect of inclusion size and distribution on Low Cycle Fatigue properties of an FGH97 superalloy[J].Rare Metal Materials and Engineering,2020,49(5):1614~1622.]
Effect of inclusion size and distribution on Low Cycle Fatigue properties of an FGH97 superalloy
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Received:February 14, 2019  Revised:March 15, 2019
DOI:
Key words: FGH97 P/M superalloy  Microstructure  Low Cycle Fatigue  Inclusion
Foundation item:深圳市海外高层次人才资金项目(20150128085205453) 深圳科技创新委员会项目(20170308111659935)
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yangjinlong,zhuxiaomin,xiongjiangying,chenqi and guojianzheng  
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Abstract:
      Scanning Electron Microscopy, Energy Dispersive Spectroscopy, Metallographic Microscope and Low Cycle Fatigue testing machine were used to study the relationship between the Low Cycle Fatigue performance of 650 °C/ maximum stress 980MPa and the size, area ,distribution of fracture inclusions of a nickel-based FGH97 superalloy. The results show that the low-cycle fatigue fracture is mainly casued by non-metallic inclusions. If the size or area of the non-metallic inclusions is less than a critical value(about 80μm), there is no significant effect on the low cycle fatigue life of 650 ℃/ maximum stress 980MPa , and the average life value reaches 190,992 cycles. The distribution of inclusions has no significant influence on the low cycle fatigue life when the size is less than the critical value of 80μm.When the size exceeds the critical value, the larger size of inclusion and the closer to surface result in the lower the low cycle fatigue life.