| Fatigue crack propagation behavior of K40S cobalt-base superalloy at elevated temperature |
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| 作者姓名： | 杨富民 孙晓峰 管恒荣 邓午立 刘芳 胡壮麒 |
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| 作者单位： | Institute of Metal Research，Chinese Academy of Sciences，Shenyang 110016，China，Institute of Metal Research，Chinese Academy of Sciences，Shenyang 110016，China，Institute of Metal Research，Chinese Academy of Sciences，Shenyang 110016，China，Shenyang Aero-engine Research Institute，Shenyang 110034，China，Shenyang Aero-engine Research Institute，Shenyang 110034，China，Institute of Metal Research，Chinese Academy of Sciences，Shenyang 110016，China |
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| 摘 要： | 1 ＩＮＴＲＯＤＵＣＴＩＯＮＤｕｅｔｏａｇｏｏｄｃｏｍｂｉｎａｔｉｏｎｏｆｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｒｕｐ ｔｕｒｅｓｔｒｅｓｓａｎｄｅｘｃｅｌｌｅｎｔｈｏｔｃｏｒｒｏｓｉｏｎｒｅｓｉｓｔａｎｃｅａｆｔｅｒｐｒｏ ｌｏｎｇｅｄｅｘｐｏｓｕｒｅ ,ｃａｓｔｃｏｂａｌｔ ｂａｓｅｓｕｐｅｒａｌｌｏｙｓａｒｅｗｉｄｅｌｙｕｓｅｄｉｎｍａｎｙｍｉｌｉｔａｒｙａｎｄｃｏｍｍｅｒｃｉａｌｅｎｇｉｎｅｓａｓｈｉｇｈｔｅｍｐｅｒａｔｕｒｅｓｔｒｕｃｔｕｒａｌｃｏｍｐｏｎｅｎｔｓ1,2 ] .Ｋ4 0Ｓａｌｌｏｙｉｓａｃｏ…
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| 关 键 词： | 钴基超合金 疲劳断裂 失效极限 延展性 高温 |
Fatigue crack propagation behavior of K40S cobalt-base superalloy at elevated temperature |
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| YANG Fu-min ,SUN Xiao-feng ,GUAN Heng-rong ,DENG Wu-li ,LIU Fang ,HU Zhuang-qi.Fatigue crack propagation behavior of K40S cobalt-base superalloy at elevated temperature[J].Transactions of Nonferrous Metals Society of China,2003,13(1):50-54. |
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| Authors: | YANG Fu-min SUN Xiao-feng GUAN Heng-rong DENG Wu-li LIU Fang HU Zhuang-qi |
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| Affiliation: | YANG Fu-min 1,SUN Xiao-feng 1,GUAN Heng-rong 1,DENG Wu-li 2,LIU Fang 2,HU Zhuang-qi 1 |
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| Abstract: | Fatigue crack propagation behavior of K40S cobalt-base superalloy under ambient atmosphere at 700 ℃and 900 ℃ was investigated. The detailed fatigue crack propagation and fracture mechanism under the alternatingloads were studied. The results show that, there is a defined threshold for K40S alloy at elevated temperatures. Thefatigue threshold is 23.9 MPa @ m1/2 at 700 ℃ and 12 MPa @ m1/2 at 900℃. The significant decrease of the thresholdwith increasing temperature is associated with the oxidation induced embrittlement at crack tip. Observation on thefatigue fracture surfaces indicates a ductile fracture mechanism related to the fatigue crack growth. |
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| Keywords: | cobalt-base superalloy fatigue crack propagation fatigue threshold ductility |
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