冷轧TA18钛合金管材退火织构的形成机制  

Formation Mechanism of Annealing Texture of Cold Rolled TA18 Titanium Alloy Tube

作　　者：杨奇 惠松骁[1,2,3] 叶文君 徐哲[4] 代春 王俭[4] 高颀[4] Yang Qi;Hui Songxiao;Ye Wenjun;Xu Zhe;Dai Chun;Wang Jian;Gao Qi(State Key Laboratory of Non-ferrous Metals and Processes,GRINM Group Co.,Ltd,Beijing 100088,China;GRIMAT Engineering Institute Co.,Ltd,Beijing 101407,China;General Research Institute for Nonferrous Metals,Beijing 100088,China;BAOTI Group Co.,Ltd,Baoji 721014,China)

机构地区：[1]有研科技集团有限公司、有色金属材料制备加工国家重点实验室,北京100088 [2]有研工程技术研究院有限公司,北京101407 [3]北京有色金属研究总院,北京100088 [4]宝钛集团有限公司,陕西宝鸡721014

出　　处：《稀有金属材料与工程》2023年第3期899-910,共12页Rare Metal Materials and Engineering

摘　　要：TA18钛合金管材因使用环境要求应具有特定的径向基面织构,退火温度是其重要影响因素之一,为了揭示管材退火织构的形成机制,选取Φ8 mm×0.6 mm冷轧管材以及经450、500、550、600、650、700、750℃/3 h等温度退火管材为试验材料,利用电子背散射衍射(EBSD)技术研究了管材晶粒在不同退火温度下的取向特性。结果表明:初始冷轧管材具有较强的径向基面织构,且<1010>晶向主要平行于管材轴向;管材在450~550℃、550~650℃、650~750℃退火时分别发生了回复、再结晶及晶粒长大,管材织构的转变主要发生在再结晶及晶粒长大阶段,随着再结晶的发生,管材径向织构不断增强,再结晶后的<1120>晶向主要平行于管材轴向。再结晶退火使管材径向织构增强的主要原因是,原冷轧管材中的细小晶粒具有比基体更强的径向取向,再结晶晶粒优先在这些细小晶粒处形核生长,并获得了强径向取向,在随后的晶粒长大过程中,这些强径向取向晶粒不断长大并占据优势,从而使管材表现出强径向分布的“再结晶织构”。TA18 titanium alloy tube has specific radial basal texture due to the requirement of its service environment and the annealing temperature is one of the important factors.In order to reveal the formation mechanism of annealing texture of the tube,theФ8 mm×0.6 mm cold rolled tube and the annealed tube at 450,500,550,600,650,700,750℃/3 h were selected as experimental materials.The grain orientation characteristics of the tubes at different annealing temperatures were studied by electron backscatter diffraction(EBSD).The results show that the cold rolled tube has great radial basal texture and<1010>direction is mainly parallel to the axial direction of tube.The grain recovery,recrystallization and growth occur at annealing temperature of 450-550℃,550-650℃,650-750℃,respectively,and the transformation of texture occurs during the stage of grain recrystallization and growth.With the occurrence of recrystallization,the radial texture of tube is enhanced and the<1120>direction is mainly parallel to the axial direction.The main cause of radial texture enhancement is that the fine grain of original cold rolled tube has more obvious radial orientation than the matrix,and the crystallization grain is prior to nucleation and growth around the fine grain and obtains strong radial orientation.During the following process of grain growth,the grain with strong radial orientation can grow dominantly,so that the tube can perform obvious radial distributed“recrystallization texture”.

关 键 词：TA18钛合金 再结晶退火 织构 Kearns系数 

分 类 号：TG146.23[一般工业技术—材料科学与工程]