K4169镍铁基高温合金超低温拉伸断裂行为分析  

Analysis of Ultra-low Temperature Tensile Fracture Behavior of K4169 Ni-Fe Base Superalloy

作　　者：王泽宇 舒德龙 王宏菲 李雪松 张典 WANG Ze-yu;SHU De-long;WANG Hong-fei;LI Xue-song;ZHANG Dian(Liaoning Redsilver Metal Co.,Ltd.Fushun 113122,China)

机构地区：[1]辽宁红银金属有限公司,辽宁沈抚113122

出　　处：《全面腐蚀控制》2025年第3期161-163,共3页Total Corrosion Control

基　　金：沈阳市科技计划项目(22-316-1-01)。

摘　　要：本文通过对K4169合金在-196℃下进行拉伸性能测试,组织形貌观察及断裂机制分析,研究了显微疏松K4169合金在超低温下的拉伸断裂行为。结果表明,合金中主要的薄弱相是合金内部析出的富Nb和富Ti的两种MC碳化物相,碳化物的脆性断裂是合金裂纹萌生的主要原因。同时,碳化物与基体界面位置以及合金内部显微疏松在应力作用下的长大连结,也会成为裂纹扩展的主要通道,这是合金在低温下拉伸断裂的主要原因。This article investigates the tensile fracture behavior of K4169 alloy at low temperatures by conducting tensile performance tests,observing its microstructure,and analyzing its fracture mechanism at-196℃.The results indicate that the main weak phases in the alloy are the two MC carbide phases rich in Nb and Ti precipitated inside the alloy,and the brittle fracture of the carbides is the main reason for the initiation of alloy cracks.At the same time,the interface between carbides and matrix,as well as the growth and connection of micro porosity inside the alloy under stress,will also become the main channel for crack propagation,which is the main reason for the alloy’s tensile fracture at low temperatures.

关 键 词：铁镍基高温合金 低温拉伸 失效分析 碳化物 

分 类 号：TE983[石油与天然气工程—石油机械设备]