退火温度对Gr.4纯钛薄板微观结构及力学性能的影响研究  

Influence of Annealing Temperature on Microstructure and Mechanical Properties of Gr.4 Pure Titanium Sheet

作　　者：俞翔 袁秦峰 周青智 梁必成 陈岩 刘涛 Yu Xiang;Yuan Qinfeng;Zhou Qingzhi;Liang Bicheng;Chen Yan;Liu Tao(Zhejiang Shenji Titanium Industry Co.,Ltd.,Huzhou 313306,China)

机构地区：[1]浙江申吉钛业股份有限公司,浙江湖州313306

出　　处：《钛工业进展》2024年第4期17-22,共6页Titanium Industry Progress

摘　　要：对冷轧后的Gr.4纯钛薄板进行不同温度的退火处理,利用电子背散射衍射技术(EBSD)分析其晶粒尺寸、晶界分布、位错密度和微织构,并讨论它们与力学性能之间的关系。结果表明:在740、780、820℃退火温度下,Gr.4纯钛薄板的晶粒尺寸差别不大;退火后可能存在10.53°、60°、60.83°、63.26°、90°5种α/α取向差角度,并且表现出随机性;α晶粒内的位错密度随着过冷度的上升而变小;在780℃退火条件下,呈现出最强的<0110>织构,即Ti原子最密排方向,其抵抗位错滑移的能力最强,因而强度最大,且强塑性匹配较好。The cold-rolled Gr.4 pure titanium sheet was annealed at different temperatures,and its grain size,grain boundary distribution,dislocation density,and micro-texture were analyzed in association with mechanical properties by using EBSD(electron backscattering diffraction).The results show that the grain size slightly varies with the annealing temperatures of 740,780,820℃.There may be five uniqueα/αorientation differences of 10.53°,60°,60.83°,63.26°and 90°after annealing,and the misorientation angles of five uniqueα/αgrain boundaries display a random distribution.The intragranular dislocation density ofαgrains decreases with increasing under-cooling temperatures.The sample exhibits a strong<0110>fiber texture when annealed at 780℃.This is consistent with the close-packed direction of Ti atoms,indicating the best capability to resist the Ti atom slipping,resulting in the highest strength and good strength plasticity matching.

关 键 词：Gr.4纯钛 薄板 退火热处理 微观结构 EBSD 

分 类 号：TG166.5[金属学及工艺—热处理] TG146.23[金属学及工艺—金属学]