| DZ408合金低周疲劳行为 |
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| 引用本文： | 张仕朝.DZ408合金低周疲劳行为[J].航空材料学报,2016(1):93-97. |
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| 作者姓名： | 张仕朝 |
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| 作者单位： | 北京航空材料研究院，北京 100095; 航空材料检测与评价北京市重点实验室，北京 100095; 先进高温结构材料科技重点实验室，北京 100095 |
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| 摘 要： | 研究了 DZ408合金在950℃，1000℃和1050℃，应变比为0．05条件下的低周疲劳性能。结果表明：平均应变为正时，非对称循环应变控制会产生平均应力松弛现象，且随着温度与应变幅的增大，平均应力松弛速率增大；在950℃，1000℃和1050℃时，材料具有 Massing 特性，采用修正的 SWT 模型能很好地预测不同温度下应变比为0．05的低周疲劳寿命，且给出了修正 SWT 模型参数随温度变化的关系式Δεt 2σmax ＝（－38．9＋0．101 T）N（0．96－0．0014T）。
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| 关 键 词： | DZ408 低周疲劳 应变比 平均应力松弛 |
Low-cycle Fatigue of Directionally Solidified Superalloy DZ408 |
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| Abstract: | The total strain-controlled low cycle fatigue(LCF)behaviors of directionally solidified(DS)superalloy DZ408 at 950 ℃, 1000 ℃ and 1050 ℃ for R =0.05 were investigated.The results of LCF tests indicate that the mean stress relaxation is occurred under asymmetric straining .The rate of mean stress relaxation is increased with the increase of temperature and strain amplitude.The alloy has Massing characteristic at 950 ℃,1000 ℃ and 1050 ℃ for R =0.05.All the LCF data obtained under various temperatures are well correlated by the modified SWT approach for lifetime prediction,and also the relationship between temperature and parameter of modi-fied SWT model are obtained. |
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| Keywords: | DZ408 DS superalloy low cycle fatigue strain ratio mean stress relaxation |
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