热处理对选区激光熔化Ti-6A1-4V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
李典 1陈静 2谭华 2姚波 2张思雨 2郝志伟 2林鑫2
作者信息
- 1. 西北工业大学材料学院,陕西西安 710072;西北有色金属研究院,陕西西安 710016
- 2. 西北工业大学材料学院,陕西西安 710072
- 折叠
摘要
为提高选区激光熔化Ti-6A1-4V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-6A1-4V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.
Abstract
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 grown βcolumnar grains and acicular martensite α'with a certain orientation in the grains.After annealing,α'decomposes and is transformed into basket-weave α+β.After cyclic heat treatment,lath α becomes globularized,and the microstructure is composed of equiaxed α,lath α and residual β.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-6A1-4V合金/热处理/低周疲劳Key words
selective laser melting/Ti-6Al-4V alloy/heat treatment/low cycle fatigue引用本文复制引用
基金项目
国家重点研发计划(2022YFB4600300)
出版年
2024
NETL
NSTL
万方数据