热处理对选区激光熔化Ti-6Al-4V合金低周疲劳性能的影响  

Effects of Heat Treatment on Low Cycle Fatigue Properties of Selective Laser Melting Ti-6Al-4V Alloy

作　　者：李典 陈静[1] 谭华[1] 姚波 张思雨 郝志伟 林鑫[1] Li Dian;Chen Jing;Tan Hua;Yao Bo;Zhang Siyu;Hao Zhiwei;Lin Xin(School of Materials Science and Engineering,Northwestern Polytechnical University,Xi’an 710072,China;Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北工业大学材料学院,陕西西安710072 [2]西北有色金属研究院,陕西西安710016

出　　处：《稀有金属材料与工程》2024年第9期2503-2512,共10页Rare Metal Materials and Engineering

基　　金：国家重点研发计划(2022YFB4600300)。

摘　　要：为提高选区激光熔化Ti-6Al-4V合金的低周疲劳性能,利用OM、SEM、TEM、室温拉伸及低周疲劳试验研究了热处理对选区激光熔化Ti-6Al-4V合金组织及性能的影响。结果表明,沉积态组织表现为外延生长的β柱状晶及晶内呈一定取向关系的针状马氏体α′,经退火后α′发生分解转变为网篮编织状的α+β,经循环热处理后板条α发生球化,组织由等轴α、板条α和残余β构成。经热处理后,退火态低周疲劳性能达到锻件的87%以上,循环热处理态达到锻件的90%以上。In order to improve the low cycle fatigue property of selective laser melting Ti-6Al-4V alloy,the effects of heat treatment on the microstructure and properties of selective laser melting Ti-6Al-4V alloy were studied by OM,SEM,TEM,room temperature tensile and low cycle fatigue tests.The results show that the as-built microstructure is characterized by epitaxially grownβcolumnar grains and acicular martensiteα′with a certain orientation in the grains.After annealing,α′decomposes and is transformed into basket-weaveα+β.After cyclic heat treatment,lathαbecomes globularized,and the microstructure is composed of equiaxedα,lathαand residualβ.After heat treatment,the low cycle fatigue property of the annealed alloy reaches more than 87%of that of the forgings.Besides,the property of cyclic heat treated alloy reaches more than 90%of that of the forgings.

关 键 词：选区激光熔化 TI-6AL-4V合金 热处理 低周疲劳 

分 类 号：TG146.23[一般工业技术—材料科学与工程]