航空Ti-55511合金高温变形微观组织演变研究  

Study on microstructure evolution of aviation Ti-55511 alloy during high temperature deformation

作　　者：邵晖 单迪 张慧 张赛飞 孙峰[2] 赵小花[2] 王凯旋[2] 孙利星 邹军涛[1] SHAO Hui;SHAN Di;ZHANG Hui;ZHANG Sai-fei;SUN Feng;ZHAO Xiao-hua;WANG Kai-xuan;SUN Li-xing;ZOU Jun-tao(School of Materials Science and Engineering,Xi'an University of Technology,Xi'an 710048,China;Western Superconducting Technologies Co.,Ltd.,Xi'an 710018,China)

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]西部超导材料科技股份有限公司,陕西西安710018

出　　处：《重型机械》2022年第4期47-52,共6页Heavy Machinery

基　　金：国家自然科学基金资助(51501150和52005406);陕西省科技厅自然基金项目(2020JM-461和19JK0590);陕西省教育厅重点实验室项目(20JS107);西安市先进制造技术攻关项目(21XJZZ0056和21XJZZ0049);大学生创新创业训练计划国家级项目(S202110700029和S202110700077)。

摘　　要：通过对具有黑斑缺陷的Ti-55511合金进行不同温度和不同应变量的高温变形实验,采用OM和SEM/EBSD技术对显微组织进行观察,研究了合金高温变形过程中β晶粒的再结晶行为,分析了变形时微观组织演变对压缩应力-应变曲线的影响。结果表明:随着高温压缩应变增加,应力呈现两阶段不连续屈服现象;随着温度和应变的增加,连续动态再结晶和不连续再结晶逐渐显著,动态回复仍占主导作用;动态回复和动态再结晶耦合效应是应力下降的直接原因。The high temperature deformation experiments of Ti-55511 alloy with black spot defects at different temperature and strain were carried out.The microstructure was observed by OM and SEM/EBSD technology,and the β recrystallization behavior was investigated during the high temperature deformation process.The effect of microstructure on compressive stress-strain curve was analyzed.The results show that the stress-strain curves presents two-stage discontinuous yield phenomenon with increasing the compressive strain.With the increase of temperature and strain,the continuous and discontinuous dynamic recrystallization are gradually significant,and dynamic recovery still plays a leading role.The stress decrease is depended on the coupling effecting of dynamic recrystallization and recovery.

关 键 词：钛合金 变形 组织 再结晶 

分 类 号：TG166.5[金属学及工艺—热处理]