Orientation Dependence of Low Cycle Fatigue Properties of a Ni-based Single Crystal Superalloy DD10
取向偏离度对镍基单晶高温合金DD10低周疲劳行为的影响
查看参考文献33篇
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文摘
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Low cycle fatigue (LCF) properties of a nickel-based single crystal (SX) superalloy DD10 with different orientation deviation angles from the [001] axis were investigated at 760 ℃ with an invariable total strain amplitude of 1.4%. Results reveal that the LCF behaviors of DD10 exhibit a strong orientation-dependence. The fatigue life decreases apparently with the increment of the orientation deviation angle. For specimens with the same orientation deviation angle from the [001] axis, those on the [001]-[011] boundary exhibit a longer fatigue life than ones on the [001]-[111] boundary. It is found that the orientation-dependence of fatigue life stems from the difference of accumulated plastic deformation per cycle. On the other hand, both of total stress amplitude and plastic strain amplitude show a reverse orientation-dependence compared with the fatigue life. However, the orientation deviation shows no influence on the model of fatigue crack initiation and subsequent propagation. |
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其他语种文摘
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研究了特定试验条件下,镍基单晶DD10取向偏离[001]的程度对其低周疲劳行为的影响。结果表明:取向偏离度对DD10合金的低周疲劳行为影响明显。疲劳寿命随取向偏离度的增加而明显降低,在同等偏离度下,晶体取向靠近[001]-[011]的合金低周寿命优于取向靠近[001]-[111]的合金;分析发现:不同取向偏离度合金DD10低周疲劳寿命的差异源于其每循环周次的可累计塑性变形的差异。另一方面,取向偏离度对疲劳总应力幅和塑性应变幅的影响却截然相反,但对疲劳裂纹萌生和扩展方式影响不大。 |
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来源
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稀有金属材料与工程
,2018,47(1):1-6 【核心库】
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关键词
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single crystal superalloy
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DD10 alloy
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orientation deviation
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low cycle fatigue
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地址
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1.
Xi'an Thermal Power Research Institute Co., Ltd, Xi'an, 710054
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Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016
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语种
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英文 |
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文献类型
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研究性论文 |
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ISSN
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1002-185X |
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学科
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金属学与金属工艺 |
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基金
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国家自然科学基金
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文献收藏号
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CSCD:6160377
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