退火处理对近α型TA15钛合金组织和硬度的影响  

Influence of annealing treatment on microstructure and hardness of near-αTA15 titanium alloy

作　　者：俞翔 袁秦峰 陈岩 刘涛 Yu Xiang;Yuan Qinfeng;Chen Yan;Liu Tao(Zhejiang Shenji Titanium Industry Co.,Ltd.,Huzhou Zhejiang 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：《金属热处理》2025年第4期241-246,共6页Heat Treatment of Metals

摘　　要：对冷轧态Ti-6.5Al-2Zr-1Mo-1V(TA15)钛合金薄板分别进行不同温度(750~980℃)的常规退火处理和双重退火处理,研究了退火制度对其组织和硬度的影响。结果表明,TA15钛合金冷轧薄板在低于相变点温度退火时,可得到等轴α_(P)相组织,在近相变点温度(965℃)退火后,得到α_(P)、α_(S)双态组织;退火温度高于相变点时,α_(P)相消失,组织为粗大魏氏α_(W)相。TA15钛合金冷轧薄板经近相变点一次退火+两相区二次退火后,获得α_(P)、α_(W)和α_(S)相三态组织。常规退火情况下,随退火温度升高,TA15钛合金冷轧薄板硬度先降低后增大;965℃×30 min,WQ+920℃×100 min,AC双重退火处理后,因α_(S)相粗化,导致硬度较常规退火低。Cold-rolled Ti-6.5Al-2Zr-1Mo-1V(TA15)titanium alloy sheet was conventionally annealed at different temperatures ranging from 750℃to 980℃and dual-stage annealed,respectively,and the effect of different annealing treatments on the microstructure and hardness of the alloy was investigated.The results indicate that when the cold-rolled TA15 titanium alloy sheet is conventionally annealed at a temperature lower than the phase transformation point,an equiaxed primaryα(α_(P))phase can be obtained.After conventional annealing at a temperature close to the phase transformation point(965℃),a bimodal structure composed ofα_(P)and lamellarα(α_(S))phases is obtained.When the conventional annealing temperature is higher than the phase transformation point,theα_(P)phase disappears,and the microstructure consists of coarse Widmanst ttenα_(W)phase.After primary annealing near the phase transformation point and secondary annealing in the two-phase region,the cold-rolled TA15 titanium alloy sheet can obtain a tri-modal structure composed ofα_(P),α_(W)andα_(S)phases.Under conventional annealing,with the increase of annealing temperature,the hardness of the cold-rolled TA15 titanium alloy sheet first decreases and then increases.After the dual-annealing of 965℃×30 min,WQ+920℃×100 min,AC,due to the coarsening ofα_(S)phase,the hardness is lower than that after the conventional annealing.

关 键 词：TA15钛合金 退火处理 微观组织 硬度 

分 类 号：TG156.2[金属学及工艺—热处理]