电热处理对Ti-55511合金黑斑组织演变及拉伸性能的影响  

Influence of Electric Heating Process on Black Spot Structure Evolution and Tensile Properties of Ti-55511 Alloy

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 Saifei;SUN Feng;ZHAO Xiaohua;WANG Kaixuan;SUN Lixing;ZOU Juntao(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,西安710048 [2]西部超导材料科技股份有限公司,西安710018

出　　处：《机械工程材料》2022年第9期40-45,共6页Materials For Mechanical Engineering

基　　金：国家自然科学基金资助项目(51501150,52005406);陕西省自然科学基础研究计划项目(2020JM-461);陕西省教育厅重点实验室项目(20JS107);陕西省教育厅自然科学专项项目(19JK0590);西安市先进制造技术攻关项目(21XJZZ0056,21XJZZ0049);国家级大学生创新创业训练计划项目(S202110700029,S202110700077)。

摘　　要：对固溶态Ti-55511合金进行905℃不同保温时间(10~60 s)的电热处理,研究了黑斑组织演变及合金拉伸性能。结果表明:固溶态合金的黑斑组织β相具有典型Goss和Cube织构取向,随着电热处理时间从10 s延长到40 s,β晶粒发生再结晶,黑斑组织含量减少;当电热处理60 s时,再结晶晶粒长大至平均尺寸为27.3μm,黑斑组织面积分数减少为2.1%。与固溶态合金相比,电热处理后合金的抗拉强度下降,断后伸长率提高;随电热处理时间延长,电热处理合金的抗拉强度基本不变,断后伸长率先增大后降低,在电热处理40 s时达到最大值20.8%;不同时间电热处理后合金的拉伸断口均呈现韧窝和准解理断裂的复合形貌。The solid soluted Ti-55511 alloy was treated by electric heating for different holding times(10-60 s) at 905 ℃, and the evolution of black spot structure and tensile properties of the alloy were studied. The results show that the β phase of black spot structure in the alloy in solid solution state had a typical Goss and Cube texture orientation. With the electric heating time increasing from 10 s to 40 s, β grains recrystallized and the black spot structure content decreased. When electric heating for 60 s, the recrystallization grain grew to average grain size of 27.3 μm and the black spot structure area fraction decreased to 2.1%. Comparing with those of the solid soluted alloy, the tensile strength of the alloy after electric heating decreased while the elongation after fracture increased. With increasing electric heating time, the tensile strength of the electric heating reated alloy kept unchanged, and the elongation after fracture increased first and then decreased, reaching the maxium value of 20.8%when electric heating for 40 s. The fracture of the alloy after electric heating for different times showed the composite morphology of dimples and quasi-cleavage fracture.

关 键 词：钛合金 电热处理 织构 拉伸性能 

分 类 号：TG166.5[金属学及工艺—热处理]