钛合金溶模精密铸件表面劳光显示缺陷形成原因  

Forming Cause of Fluorescence Showed Defects on the surface of Titanium Alloy Investment Casting

作　　者：李伟东 周浩浩 刘茵琪 杨学东 史凤岭 LI Weidong;ZHOU Haohao;LIU Yinqi;YANG Xuedong;SHI Fengling(Luoyang Shuangrui Precision Casting Titanium Co.,Ltd.,Luoyang 471000,China;AECC Shen Yang Li Ming Aero-engine Corporation Ltd.,Shenyang 110043,China)

机构地区：[1]洛阳双瑞精铸钛业有限公司,河南洛阳471000 [2]中国航发沈阳黎明航空发动机有限责任公司,辽宁沈阳110043

出　　处：《铸造技术》2021年第3期199-202,210,共5页Foundry Technology

基　　金：钛合金大型复杂薄壁结构件精密铸造技术(2020YFB2008300,2020YFB2008301)。

摘　　要：钛合金熔模精密铸件表面荧光显示缺陷严重制约了产品质量及生产周期。介绍了熔模精密铸造钛合金铸件生产过程以及后处理工艺过程中产生的表面荧光显示缺陷的类型、时间及原因。钛合金熔模精密铸件表面荧光显示缺陷类型主要表现为表面裂纹及表面凹坑;产生缺陷的时间主要为铸造后、补焊后以及真空热处理后3个时间节点;产生荧光显示缺陷的原因主要有铸造应力、金属液与型壳发生反应、补焊产生的应力以及真空热处理残余应力释放导致的表面变形产生的应力。The defects of fluorescent display on the surface of titanium alloy investment precision castings seriously restrict product quality and production cycle.This article introduces the type,time and reason of the surface fluorescent display defects in the production process of investment casting titanium alloy castings and the post-treatment process.The types of fluorescent display defects on the surface of titanium alloy investment precision castings are mainly surface cracks and surface pits;the time of defects is mainly three time nodes after casting,repair welding and vacuum heat treatment;the main reasons for the fluorescent display defects are Casting stress,the reaction between molten metal and the shell,the stress caused by repair welding,and the stress caused by surface deformation caused by the release of residual stress in vacuum heat treatment.

关 键 词：钛合金 熔模精密铸造 荧光 真空热处理 

分 类 号：TG249.2[金属学及工艺—铸造]