细小等轴α相对Ti-55531合金静态再结晶行为的影响  

Effect of Fine EquiaxedαPhase on Static Recrystallization Behavior of Ti-55531 Alloy

作　　者：王凯旋[1] 王涛[1,2] 邵晖[3] 单迪[3] 蔡璐璐[3] 孙峰 刘向宏[1] Wang Kaixuan;Wang Tao;Shao Hui;Shan Di;Cai Lulu;Sun Feng;Liu Xianghong(Western Superconducting Technologies Co.,Ltd.,National and Local Joint Engineering Laboratory of Special Titanium Alloy Preparation Technology,Xi’an 710018,China;Northwestern Polytechnical University,Xi’an 710072,China;Xi’an University of Technology,Xi’an 710048,China)

机构地区：[1]西部超导材料科技股份有限公司,特种钛合金材料制备技术国家地方联合实验室,陕西西安710018 [2]西北工业大学,陕西西安710072 [3]西安理工大学,陕西西安710048

出　　处：《钛工业进展》2020年第6期1-6,共6页Titanium Industry Progress

基　　金：国家自然科学基金资助项目(51501150);陕西省教育厅自然科学专项项目(16JK1570);陕西省自然科学基础研究计划资助项目(2020JM-461);西安市碑林区科技计划资助项目(GX2034)。

摘　　要：初始等轴组织Ti-55531合金在相变点以上经过0.01、0.1、1 s^-1不同应变速率的等温压缩变形,随后进行750℃×5 min/AC热处理。采用扫描电子显微镜和透射电子显微镜研究了后续热处理时变形α相和基体β相的静态再结晶机理。结果表明,随着应变速率的升高,残留等轴α相的含量增加。变形合金中拉长α相在经过热处理后有球化现象,同时在强度相对较高的拉长α相端部的基体β相中,位错储能较高,有助于β相再结晶形核和空冷过程中局部高密度次生α相析出。The initial equiaxed Ti-55531 alloy has been carried out the isothermal compression deformation with 0.01, 0.1 and 1 s-1 above the phase transformation point, and heat treatment at 750 ℃×5 min/AC. The scanning electron microscope and transmission electron microscope technologies were used to investigate the static recrystallization of deformed α and matrix β phases during subsequent heat treatment. The results show that the content of residual equiaxed α phase increase with the increase of strain rate. The spheroidization behavior of elongated α phase in the deformed alloy occurs after heat treatment. Meanwhile, the dislocation storage energy within β phase is large at the end of the elongated α phase with relative high strength, which facilitates the β recrystallization and nucleation and improved the local high-density secondary α-phase precipitation during air cooling.

关 键 词：钛合金 Α相 Β相 再结晶 

分 类 号：TG146.23[一般工业技术—材料科学与工程]