TC4钛合金薄壁件电子束熔丝增材修复熔覆组织及性能研究  

Microstructure Characteristics and Property of Thin-walled TC4 Titanium Alloy Repaired by EBAM

作　　者：高双胜[1,2] 靳文颖 曹霞 郭魂[2] 郭光耀[3] 张利 GAO Shuangsheng;JIN Wenying;CAO Xia;GUO Hun;GUO Guangyao;ZHANG Li(China She nyang Aerospace University,Shenyang 110136,China;Changzhou Institute of Technology,Changzhou,213032,China;Dynasty Metal Additive Manufacturing Systems,Xi'an,710003,China)

机构地区：[1]沈阳航空航天大学,辽宁沈阳110136 [2]常州工学院,江苏常州213032 [3]西安智熔金属打印系统有限公司,陕西西安710003

出　　处：《热加工工艺》2022年第12期71-73,共3页Hot Working Technology

基　　金：校企合作项目(E4-6111-17-044)。

摘　　要：本文利用电子束熔丝增材制造系统对TC4钛合金薄壁件进行了修复试验,分析了熔覆组织及硬度分布特征。结果表明:堆积层宏观组织是由α晶粒充当晶界包裹不规则的原始β柱状晶粒组成,柱状晶贯穿了堆积层横截面,存在明显的分层现象;层带结构“明亮”部分为粗大无规则的板条马氏体,“灰暗”部分为网篮编织的细长针状马氏体;堆积层自基体向上的硬度分布呈下降趋势,“明亮”部分对应硬度有明显升跳。In this paper, the TC4 titanium alloy of thin-walled parts were repaired by the Electron beam additive melting system, and the microstructure characteristics and microhardness distribution of the repaired workpiece was studied. The results showed that the accumulation’s macrostructure was composed of irregular β columnar grains which surrounded by αgrains, through the cross section. There’s also layered phenomenon appeared: the "bright" zone was irregular bulky lath martensite, and the "gray" zone was basket-weaved acicular martensite. Hardness decreases from the bottom of base metal to surface, and corresponding “bright” hardness arised obviously fluctuate.

关 键 词：电子束增材制造 TC4钛合金 显微组织 硬度 

分 类 号：TG247[金属学及工艺—铸造]