大截面TC4钛合金锻件缺陷形成机理研究  

Study on Defects Formation Mechanism of Large Section TC4 Titanium Forging

作　　者：范玉婷 郑友平 秦海旭 李京懋 Fan Yuting;Zheng Youping;Qin Haixu;Li Jingmao(State Key Laboratory of Vanadium and Titanium Resources Comprehensive Utilization,Panzhihua 617000,China;Chengdu Advanced Metal Materials Industry Technology Research Institute Co.,Ltd.,Chengdu 610300,China)

机构地区：[1]钒钛资源综合利用重点实验室,四川攀枝花617000 [2]成都先进金属材料产业技术研究院股份有限公司,四川成都610300

出　　处：《钛工业进展》2024年第6期27-32,共6页Titanium Industry Progress

摘　　要：在对某大截面TC4钛合金锻件进行超声波探伤时,发现存在不规则孔洞和黑斑缺陷,故对其进行了元素分析、微观组织观察、织构测试、微区成分分析以及硬度检测,研究了微观组织形态,分析了缺陷产生的原因。结果表明:孔洞缺陷附近Al、V、Fe元素出现有规律的波动,产生原因是铸锭冒口的残留,导致锻件内部出现孔洞;黑斑区晶粒粗大、内部应力较为集中、位错密度大、硬度也较高,是一种明显的冶金缺陷,其产生原因是微区化学成分不均匀,造成富α相元素(Al)的偏析。During ultrasonic testing of a large section TC4 titanium alloy forging,irregular hole and black spots were found.In order to find the causes of these defects,elemental analysis,microstructure observation,texture testing,micro area composition analysis,and hardness testing were carried out.The results show that there are regular fluctuations in Al,V,and Fe elements near the hole defect,which is caused by the residual riser of the ingot.The black spot area has coarse grains,concentrated internal stress,high dislocation density,and high hardness,which is a significant metallurgical defect caused by uneven chemical composition in the micro area,resulting in segregation of rich alpha phase element(Al).

关 键 词：TC4钛合金 锻件 孔洞缺陷 黑斑 偏析 

分 类 号：TG146.23[一般工业技术—材料科学与工程]