轧制温度对Ti-6Al-4V合金棒材组织的影响  

Effect of Rolling Temperature on Microstructure of Ti-6Al-4V Alloy Bar

作　　者：单迪 陶冰倩 席爱迎 邵晖 SHAN Di;TAO Bingqian;XI Aiying;SHAO Hui(Faculty of Printing,Packaging and Digital Media,Xi'an University of Technology,Xi'an 710048,China;Faculty of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China)

机构地区：[1]西安理工大学印刷包装与数字媒体学院,陕西西安710048 [2]西安理工大学材料科学与工程学院,陕西西安710048

出　　处：《热加工工艺》2021年第17期81-83,共3页Hot Working Technology

基　　金：陕西省自然科学基础研究计划项目(2020JM-461);陕西省教育厅重点科学研究计划项目(20JS107);西安市碑林区科技计划项目(GX2034)。

摘　　要：在Ti-6Al-4V合金的连续轧制过程中,变形温升对棒材组织转变有重要作用,影响棒材性能的均匀性。本文采用弹塑性有限元法对Ti-6Al-4V合金棒材的轧制过程进行数值模拟,分析各道次棒材中心处应变、应变速率对变形温升的影响规律。基于变形温升规律的分析,对轧制温度进行优化,并比较了工艺改进前后的组织形貌。结果表明:第10道次轧制(椭圆-圆孔型)变形引起棒材中心温度快速升高,致使中心位置的α相含量减少和β相含量增多,棒材横截面出现宏观缺陷,组织分布不均匀。During continuous rolling of Ti-6Al-4V alloy, deformation temperature rise plays an important role in the microstructure transformation of the bar and affects the uniformity of bar properties. The rolling process of Ti-6Al-4V alloy bar was numerically simulated by the elastic-plastic finite element method. The influence of strain and strain rate on deformation temperature rise at the bar center of each pass was analyzed. Based on the analysis of deformation temperature rise, the rolling temperature was optimized and the microstructure before and after the process improvement was compared.The results show that the 10th pass rolling(elliptic-circular pass) deformation causes the bar center temperature to rise rapidly,causes the center position’s α phase content to decrease and the β phase content to increase. The macro-defects in cross section of the bar appear, and the distribution of microstructure is not uniform.

关 键 词：TI-6AL-4V钛合金 轧制棒材 连续轧制 低倍缺陷 

分 类 号：TG339[金属学及工艺—金属压力加工] TG146.4[一般工业技术—材料科学与工程]