镍基粉末高温合金FGH96应变疲劳行为  

Reserch on low cycle fatigue behavior of powder metallurgy superalloy FGH96

作　　者：周磊 王泓[1] 张国栋[2] 苏彬[2] 

机构地区：[1]西北工业大学材料科学与工程学院,西安710072 [2]北京航空材料研究院二十五研究室,北京100095

出　　处：《塑性工程学报》2009年第5期149-154,共6页Journal of Plasticity Engineering

摘　　要：对镍基粉末高温合金FGH96在750℃、应变比R=0.05下的应变疲劳循环应力响应曲线、循环应力-应变曲线和应变-寿命曲线进行分析,通过非线性回归拟合,得到基于Manson-Coffin公式及郑公式两种处理模型的应变—寿命曲线及相关参数。结果表明,FGH96合金在实验加载条件下,出现了循环软化—稳定—再软化断裂的应力响应特性,并随着加载应变幅的提高而愈加明显。与Manson-Coffin公式相比,郑公式在宏观预测应变疲劳寿命,尤其是确定材料疲劳极限问题上取得很好的预测效果。Low cycle fatigue （LCF） properties of Powder Metallurgy （PM） superalloy FGH96 at 750℃were studied in this paper. After testing and analyzing the data, parameters of median and probability were given, Then the data is processed by Manson-Coffin method and Zheng Xiulin （s method. The results show that FGH96 superalloy exhibits cyclic stress response of cyclic softing at 750℃, and of initial softing followed by hardening at △ε=0.6%. Low cycle fatigue life prediction shows that the of Zheng method has a better life prediction capability in approving the existence of the endurance fatigue limit in theory than those of Manson-Coffiin＇s. Conclusions can be applied analytically in estimating the life of superalloy FGH96 and providing the basis of the aircraft engine＇s powder turbine disk design selection and mechanical properties under high temperature.

关 键 词：镍基粉末高温合金 FGH96 高温低周疲劳 寿命预测 

分 类 号：TG113.255[金属学及工艺—物理冶金]