| 不同温度下镍基单晶高温合金的低周疲劳性能 |
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| 引用本文： | 史振学,胡颖涛,刘世忠. 不同温度下镍基单晶高温合金的低周疲劳性能[J]. 机械工程材料, 2021, 45(3): 16-20,28. DOI: 10.11973/jxgccl202103004 |
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| 作者姓名： | 史振学 胡颖涛 刘世忠 |
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| 作者单位： | 中国航发北京航空材料研究院,先进高温结构材料重点实验室,北京 100095;中国航发西安航空发动机有限公司铸造厂,西安 710021 |
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| 摘 要： | 研究了Ni-Cr-Co-Mo-W-Ta-Nb-Re-Al-Hf-C系镍基单晶高温合金在不同温度(800,980℃)下的低周疲劳性能.结果表明:与800℃下相比,980℃下合金的塑性变形量更大,损伤更严重,疲劳强度更低,寿命更短;2种温度下合金的疲劳断裂均为类解理断裂;800℃时,裂纹萌生于疏松组织处,沿{111}平面扩...
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| 关 键 词： | 镍基单晶高温合金 低周疲劳性能 疲劳寿命 断口 位错 |
Low Cycle Fatigue Properties of Nickel Base Single Crystal Superalloy at Different Temperatures |
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| SHI Zhenxue,HU Yingtao,LIU Shizhong. Low Cycle Fatigue Properties of Nickel Base Single Crystal Superalloy at Different Temperatures[J]. Materials For Mechanical Engineering, 2021, 45(3): 16-20,28. DOI: 10.11973/jxgccl202103004 |
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| Authors: | SHI Zhenxue HU Yingtao LIU Shizhong |
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| Affiliation: | (Key Laboratory of Advanced High Temperature Structural Materials,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Precision Investment Casting,AECC Xi'an Aero-Engine Co.,Ltd.,Xi'an 710021,China) |
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| Abstract: | The low cycle fatigue properties of the Ni-Cr-Co-Mo-W-Ta-Nb-Re-Al-Hf-C series single crystal superalloy at different temperatures(800,980℃)were studied.The results show that compared with those at 800℃,the plastic deformation of the alloy at 980℃was greater,the damage was more serious,the fatigue strength was lower,and the life was shorter.The fatigue fractures of the alloys at two temperatures were cleavagelike fractures.At 800℃,the crack initiated at the loose microstructure and propagated along the{111}plane,and the instantaneous fracture area was relatively large.At 980℃,the crack initiated at the brittle oxide scale and propagated along the{001}plane perpendicular to the stress axis,and the instantaneous fracture area was relatively small. |
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| Keywords: | single crystal superalloy low cycle fatigue property fatigue life fracture dislocation |
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