GH4169镍基高温合金螺母热镦开裂分析  

Analysis for Heat Heading Cracking of GH4169 Nuts

作　　者：许永春 冯德荣 

机构地区：[1]河南信阳

出　　处：《紧固件技术》2013年第1期33-38,共6页

摘　　要：GH4169是一种重要的镍基高温合金，由于具有良好的合金性能，在航天航空发动机上得到广泛应用。 本文对热镦后GH4169螺母开裂进行了系统分析和初步探讨。提出了螺母镦制时，由于采用高频加热，加热速度快，参数不易控制，过热导致产生了δ相，在晶界及孪晶界析出，破坏了基体的连续性，以及应力集中两者的共同作用，是造成螺母开裂的根本原因。GH4169 is a kind of very important nickel base heat-resistant alloy. It is used to manufacture aerospace engine mostly, for its best performance. This article was analyzed the crack of nuts after heat-heading, and found the cause why the crack was took place： use high frequency heating, the parameter was not easy to control, Overheated material made the δ phase, which had precipitated at the grain boundary and twin crystal boundary. The δ phase destroyed the matrix of continuity. The other cause is stress concentration. The nuts were cracked at both of the two factors.

关 键 词：GH4169螺母 开裂 Δ相 应力集中 过热 

分 类 号：TG132.32[一般工业技术—材料科学与工程]