一种高W镍基高温合金的长期高温持久行为  

Long Term High-Temperature Stress Rupture Behavior of a High W Content Ni-Base Superalloy

作　　者：曹江 岳治衡 王泽宇 舒德龙 李欢 张璐 郑钰洁 CAO Jiang;YUE Zhi-heng;WANG Ze-yu;SHU De-long;LI Huan;ZHANG Lu;ZHENG Yu-jie(Air Force Representative Office,Chengdu 610503,Sichuan,China;Liaoning Redsilver Metal Co.,Ltd.,Fushun 113122,Liaoning,China)

机构地区：[1]空军某军代表室,四川成都610503 [2]辽宁红银金属有限公司,辽宁抚顺113122

出　　处：《铸造》2024年第10期1353-1358,共6页Foundry

基　　金：沈阳市科技计划项目(22-316-1-01)。

摘　　要：通过对K465镍基高温合金的典型组织、1050℃/60 MPa条件下持久变形的组织演化行为及断裂行为进行观察分析,研究了K465合金在1050℃/60 MPa下长期持久变形期间的失效行为。结果表明,合金在1050℃/60 MPa下的持久寿命约为726 h,除常见的γ′相筏化等组织演变外,高温持久试验时,合金中析出了大量的针状M_(6)C相,但并非为裂纹扩展的通道。合金的主要断裂机制为在高温持久变形期间,表面氧化产生的向内扩散的裂纹与合金内部微孔相互连接形成的裂纹沿着晶界及枝晶间等薄弱位置扩展连接,导致合金断裂失效。By observing and analyzing the typical microstructure,microstructure evolution behavior,and fracture behavior of K465 nickel based superalloy during long-term stress rupture experiment at 1050℃/60 MPa,the fracture behavior of the K465 alloy during the long-term stress rupture experiment at 1050℃/60 MPa was studied.The results showed that the stress rupture life of the alloy at 1050℃/60 MPa was about 726 h.In addition to the common structure evolution such asγ′phase rafting,a large number of acicular M_(6)C phases precipitated in the alloy during the high temperature lasting test,but it was not a channel for crack propagation.The main fracture mechanism of the alloys was the inward spreading cracks generated by surface oxidation during high-temperature persistent deformation,and the cracks formed by interconnection with internal micropores in the alloy extend and connect along weak positions such as grain boundaries and interdendritic boundaries,leading to fracture failure of the alloy.

关 键 词：镍基高温合金 高温持久 失效行为分析 γ′相 

分 类 号：TG146.15[一般工业技术—材料科学与工程] TG132.33[金属学及工艺—金属材料]