基于晶体塑性理论的镍基合金高温低周疲劳寿命预测方法  

High temperature low cycle fatigue life prediction method of nickel basedalloy based on crystal plasticity theory

作　　者：缪勇 MIAO Yong(Shanghai Aeronautical Materials&Structures Testing Co.,Ltd.,Shanghai 201318,China)

机构地区：[1]上海航空材料结构检测股份有限公司,上海201318

出　　处：《理化检验（物理分册）》2024年第4期25-30,共6页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：对Inconel 718镍基合金进行高温拉伸试验和低周疲劳试验,借助晶体塑性有限元方法分析合金的疲劳裂纹萌生过程。结果表明:Inconel 718镍基合金的高温低周疲劳裂纹萌生寿命随着总应变范围的增大而缩短;该镍基合金的高温低周疲劳裂纹容易在三叉晶界处萌生,这些区域存在较大的累积塑性滑移。The high temperature tensile test and low cycle fatigue test of Inconel 718 nickel based alloy were carried out,and the fatigue crack initiation process of the alloy was analyzed by crystal plasticity finite element method.The results show that the initiation life of high temperature low cycle fatigue crack of Inconel 718 nickel based alloy decreased with the increase of total strain range.The high temperature low cycle fatigue cracks of the nickel based alloy were easy to initiate at the trigeminal grain boundaries,and there was a large cumulative plastic slip in these areas.

关 键 词：Inconel 718镍基合金 高温低周疲劳寿命预测 微观组织 有限元模拟 疲劳指示因子 

分 类 号：TG115.5[金属学及工艺—物理冶金] TB31[金属学及工艺—金属学]