| 粉末高温合金FGH97疲劳裂纹扩展行为 |
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| 引用本文： | 佴启亮,董建新,张麦仓,郑磊,姚志浩.粉末高温合金FGH97疲劳裂纹扩展行为[J].北京科技大学学报,2016(2):248-256. |
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| 作者姓名： | 佴启亮 董建新 张麦仓 郑磊 姚志浩 |
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| 作者单位： | 北京科技大学材料科学与工程学院,北京,100083 |
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| 基金项目： | 国家自然科学基金资助项目(51371023) |
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| 摘 要： | 测定不同晶粒尺寸、γ'相以及不同Hf含量的粉末高温合金FGH97在650℃高温条件下的疲劳裂纹扩展速率,并将其与FGH95和FGH96两代粉末合金的疲劳裂纹扩展速率进行对比. 用定量分析的方法对FGH97合金在疲劳断裂各个阶段的行为特征进行分析. 较大晶粒尺寸的FGH97合金具有较低的裂纹扩展速率,合理的二次和三次γ'相匹配析出,可以获得较高的疲劳寿命;Hf元素的添加使合金的整体疲劳寿命增大;FGH97合金与FGH95和FGH96相比,具有较高的疲劳裂纹萌生抗力,更低的高温疲劳裂纹扩展速率.
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| 关 键 词： | 镍基高温合金 粉末冶金 疲劳裂纹扩展速率 铪 |
Fatigue behavior of powder metallurgy superalloy FGH97 |
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| NAI Qi-liang,DONG Jian-xin,ZHANG Mai-cang,ZHENG Lei,YAO Zhi-hao.Fatigue behavior of powder metallurgy superalloy FGH97[J].Journal of University of Science and Technology Beijing,2016(2):248-256. |
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| Authors: | NAI Qi-liang DONG Jian-xin ZHANG Mai-cang ZHENG Lei YAO Zhi-hao |
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| Abstract: | The fatigue crack growth rates of powder metallurgy ( P/M) superalloy FGH97 with different grain sizes,γ'phase sizes and Hf contents were measured at a 650℃ high temperature condition and compared with those of FGH95 and FGH96 alloys. The fatigue fracture behavior characteristic of FGH97 alloy in each stage was analyzed by the quantitative analysis method. It is found that FGH97 alloy with coarser grains has a lower fatigue crack growth rate. Reasonable match of secondary and tertiary γ' phases and Hf addition can get a higher fatigue life. Compared with FGH95 and FGH96 alloys, FGH97 alloy has the highest fatigue cack intiation resistance and exihibits the lowest fatigue crack propagation rate at high temperature. |
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| Keywords: | nickel base superalloys powder metallurgy fatigue crack growth rate hafnium |
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