热处理时间对电子束制造Ti6Al4V合金腐蚀性能的影响
Effect of Heat Treatment Duration on Corrosion Perfor-mance of Electron Beam Manufactured Ti6Al4V Alloy
黄俊媛 1张伟1
作者信息
- 1. 北京航空航天大学机械工程及自动化学院,北京 100191
- 折叠
摘要
通过1、3、5、7和9h的热处理加工电子束制备的Ti6Al4V样品,进行Tafel和电化学阻抗谱实验,讨论样品电化学腐蚀行为及机理.通过分析腐蚀性能的变化机理,发现<111>晶向越多,小角度晶界占比越大,晶粒直径越大,耐腐蚀性能越好.热处理5 h的样品呈现最均匀的<111>晶向,小角度晶界占比最大为56.2％,晶粒截距5.252 μm,此时耐腐蚀性能最好,腐蚀电流为0.037 μA/cm2.
Abstract
Ti6Al4V specimens prepared by electron beam selective melting were heat-treated for 1,3,5,7,and 9 h,and the Tafel and electrochemical impedance spectroscopy experiments were conducted to discuss the behavior and mechanism of electrochemical corrosion.Through the modification mechanism analysis of corrosion performance,it is found that the more the<111>crystal orientations,the greater the proportion of small-angle grain boundaries,the larger the grain diameter,and the better the corrosion resistance.The specimen after heat treatment for 5 h has the most uniform<111>crystal orientations.The proportion of small-angle grain boundaries is the highest of 56.2％,the grain intercept is 5.252 pm,and the corrosion resistance is optimal with corrosion current of 0.03 7 pA/cm2.
关键词
Ti6Al4V/电子束选区熔化/耐腐蚀性能/晶相/晶体结构Key words
Ti6Al4V/electron beam selective melting/corrosion resistance/crystal phase/crystal structure引用本文复制引用
基金项目
National Natural Science Foundation of China(51975036)
出版年
2024
NETL
NSTL
万方数据