超低间隙TC4-DT钛合金厚板显微组织与力学性能研究  

Study on Microstructure and Mechanical Properties of Extra Low Interstitial TC4-DT Titanium Alloy Thick Plate

作　　者：侯红苗[1] 秦成 潘浩[1] 郭萍[1] 张永强[1] Hou Hongmiao;Qin Cheng;Pan Hao;Guo Ping;Zhang Yongqiang(Northwest Institute for Nonferrous Metal Research,Xi’an 710016,China)

机构地区：[1]西北有色金属研究院,陕西西安710016

出　　处：《钛工业进展》2022年第5期1-5,共5页Titanium Industry Progress

基　　金：西安市未央区科技计划项目(202109,202105);基础加强计划技术领域基金项目(2021-JCJQ-JJ-0197)。

摘　　要：研究了固溶+时效处理对超低间隙TC4-DT钛合金厚板显微组织和力学性能的影响。结果表明,固溶温度会显著影响TC4-DT钛合金厚板组织中初生α相和次生α相的含量及尺寸,提高固溶温度可以适当提高板材的强度及断裂韧度。固溶处理冷却速率较快时(水冷和空冷),会析出细针状和板条状的片层组织,主要提高板材的断裂韧度。当固溶温度为945℃,且经水冷或空冷后可以获得强度-塑性-韧性匹配良好的TC4-DT钛合金厚板。The effect of solution and aging treatment on microstructure and mechanical properties of extra low interstitial TC4-DT titanium alloy thick plate was studied.The results show that the solution temperature significantly affects the content and size of primary and secondaryαphases in the microstructure of TC4-DT titanium alloy thick plate,and increasing the solution temperature can appropriately improve the strength and fracture toughness of the plate.After the solution treatment,when the cooling rate is faster(water cooling and air cooling),the fine needle-like and plate-like lamellar structure is precipitated,which mainly improves the fracture toughness of the plate.The solution temperature is 945℃and cooling method is water cooling or air cooling,TC4-DT titanium alloy thick plate with good matching of strength,plasticity and toughness can be obtained.

关 键 词：TC4-DT钛合金 超低间隙 固溶+时效处理 断裂韧度 

分 类 号：TG146.23[一般工业技术—材料科学与工程]