GH3030合金高温应变疲劳行为分析
Analysis on High Temperature Strain Fatigue Behavior of GH3030 Alloy
李锦娟, 王 泓, 张建国
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作者单位：(西北工业大学 材料科学与工程学院, 陕西 西安 710072)
中文关键字：GH3030合金； 循环应力-应变曲线； 应变疲劳寿命曲线； 拟合效果评价
英文关键字：GH3030 alloy; circulation stress-strain curve; strain fatigue life curve; fitting effect evaluation
中文摘要：对GH3030合金在600、 700和800 ℃，应变比R = -1时的应变疲劳行为进行研究。分析了GH3030合金循环应力-应变响应关系，运用Manson-Coffin模型和含有疲劳极限的应变疲劳公式拟合了其应变-寿命关系曲线，并通过残差分析对两式的拟合效果做出比较评价。结果表明，合金在800 ℃时疲劳寿命相对于其他两个温度明显降低。
英文摘要：Strain fatigue behaviors of GH3030 alloy at 600 ℃, 700 ℃, 800 ℃ and strain ratio R=-1 were studied. The results show that the fatigue life of the alloy at 800 ℃ decreases obviously compared with other two temperatures. Circulation stress-strain response relationship of GH3030 alloy was analyzed. Strain-life curves of the alloy were obtained by Manson- Coffin model and a new expression which contains a fatigue limit. The fitting effects of two equations were compared and evaluated by residual analysis.