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
俞翔 1袁秦峰 1周青智 1梁必成 1陈岩 1刘涛1
作者信息
- 1. 浙江申吉钛业股份有限公司,浙江 湖州 313306
- 折叠
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<01(-1)0>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.
Abstract
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 unique α/α orientation differences of 10.53°,60°,60.83°,63.26° and 90° after annealing,and the misorientation angles of five unique α/α grain boundaries display a random distribution.The intragranular dislocation density of α grains decreases with increasing under-cooling temperatures.The sample exhibits a strong<01(-1)0 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/EBSDKey words
Gr.4 pure titanium/sheet/annealing heat treatment/microstructure/EBSD引用本文复制引用
出版年
2024
NETL
NSTL
万方数据