93WNiFe钨合金铆钉顶铁断裂原因  

Reasons for fracture of 93WNiFe tungsten alloy rivet top iron

作　　者：陈礼雪 刘永恒 刘体玲 CHEN Lixue;LIU Yongheng;LIU Tiling(AVIC Guizhou Aircraft Co.,Ltd.,Anshun 561000,China)

机构地区：[1]中航贵州飞机有限责任公司,安顺561000

出　　处：《理化检验(物理分册)》2025年第2期40-43,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：某93WNiFe钨合金铆钉顶铁小头部位发生断裂现象。采用宏观观察、化学成分分析、扫描电镜及能谱分析、金相检验、密度检测、硬度测试等方法对顶铁断裂原因进行分析。结果表明:钨合金顶铁的断裂性质为脆性断裂,裂纹起源于顶铁工作小头部位的R角根部,该处截面发生变化,促进了裂纹萌生;钨合金热处理时,液相烧结进行不彻底,导致钨颗粒较小,颗粒之间没有形成结合牢固的网络状黏结相,导致合金材料内部界面结合强度降低,当合金受到应力时,微裂纹由结合力较弱的晶粒界面扩展,最终导致顶铁断裂。The small head of the 93WNiFe tungsten alloy rivet top iron broke during operation.The reasons for the fracture of the top iron were analyzed using macroscopic observation,chemical composition analysis,scanning electron microscopy and energy spectrum analysis,metallographic examination,density testing,hardness testing.The results show that the fracture property of tungsten alloy top iron was brittle fracture,and the crack originated from the root of the R angle at the working small head of the top iron,where the cross-section changed and promoted crack initiation.During the heat treatment of tungsten alloy,incomplete liquid-phase sintering resulted in small tungsten particles and the lack of a firmly bonded network like bonding phase between particles,led to a decrease in the bonding strength of the internal interface of the alloy material.When the alloy was subjected to stress,microcracks propagated from the grain interface with weaker bonding strength,ultimately led to the fracture of the top iron.

关 键 词：93WNiFe钨合金 铆钉顶铁 脆性断裂 黏结相 界面结合强度 

分 类 号：TB31[一般工业技术—材料科学与工程] TG115.2[金属学及工艺—物理冶金]