冷旋锻变形对TB9钛合金显微组织和拉伸性能的影响  

Effect of Cold Rotary-Swaging Deformation on Microstructure and Tensile Properties of TB9 Titanium Alloy

作　　者：任德春 苏虎虎 张慧博[1] 王健[1] 金伟[1,2] 杨锐[1,2] REN Dechun;SU Huhu;ZHANG Huibo;WANG Jian;JIN Wei;YANG Rui(Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China;School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China)

机构地区：[1]中国科学院金属研究所,沈阳110016 [2]中国科学技术大学材料科学与工程学院,沈阳110016

出　　处：《金属学报》2019年第4期480-488,共9页Acta Metallurgica Sinica

摘　　要：采用冷旋锻对TB9钛合金棒材进行多道次冷变形,利用OM、EBSD、XRD、TEM以及拉伸等实验研究了不同冷变形量TB9钛合金棒材的显微组织、织构和拉伸性能及其规律。结果表明,TB9钛合金棒材的晶粒尺寸随冷旋锻变形量的增大而减小,部分晶粒尺寸达到纳米级。同时,晶粒随变形量的增加沿旋锻轴向转动,形成择优取向,由初始{001}<110>和{001}<100>织构转变为<110>取向的α-fiber和γ-fiber{001}<110>、{112}<110>和{111}<110>织构。在亚结构、小尺寸晶粒以及织构的共同作用下,TB9钛合金的强度随变形量的增大而增加,延伸率和面缩率在70%冷变形后仍保持在一个较高的水平,具有优异的冷变形能力。TB9 titanium alloy has been widely used for aerospace due to it’s superior low stiffness,corrosion resistance and workability. It has been reported that cold deformation can improve the comprehensive mechanical properties of titanium alloys. At the same time, the cold rotary-swaging deformation facilitates the production of small batches and the acquisition of special shape and size bars. However,current studies on the microstructure and properties of cold rotary-swaged titanium alloys are not systematic. So, the effects of cold deformation rate on the microstructure, texture evolution and mechanical property of TB9 alloy during cold rotary-swaging were investigated using OM, EBSD, XRD, TEM and tensile test. The results showed that the grain size of TB9 titanium was refined with the increase in diameter reduction. Meanwhile, with the deformation increases, the grains rotation along the swaging axis occurs,forming a preferred orientation, the textures change from initial {001}<110> and {001}<100> to α-fiber and γ-fiber {001}<110>,{112}<110> and {111}<110>. All of grains refinement, texture components and substructures contributed to the enhancement of strength after cold rotary-swaging. And the ductile kept on a high level after 70% cold working, which means the TB9 titanium has a great cold deformation ability.

关 键 词：TB9钛合金 冷旋锻变形 显微组织 织构 拉伸性能 

分 类 号：TG146.2[一般工业技术—材料科学与工程]