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金属学报  2019, Vol. 55 Issue (4): 480-488    DOI: 10.11900/0412.1961.2018.00241
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冷旋锻变形对TB9钛合金显微组织和拉伸性能的影响
任德春1,2,苏虎虎1,2,张慧博1,王健1,金伟1,2(),杨锐1,2
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
Effect of Cold Rotary-Swaging Deformation on Microstructure and Tensile Properties of TB9 Titanium Alloy
Dechun REN1,2,Huhu SU1,2,Huibo ZHANG1,Jian WANG1,Wei JIN1,2(),Rui YANG1,2
1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang 110016, China
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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。

关键词 TB9钛合金冷旋锻变形显微组织织构拉伸性能    
Abstract

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.

Key wordsTB9 titanium alloy    cold rotary-swaging deformation    microstructure    texture    tensile property
收稿日期: 2018-03-15      出版日期: 2018-07-04
ZTFLH:  TG146.2  
通讯作者: 金伟     E-mail: wjin@imr.ac.cn
Corresponding author: Wei JIN     E-mail: wjin@imr.ac.cn
作者简介: 任德春,男,1991年生,博士生

引用本文:

任德春, 苏虎虎, 张慧博, 王健, 金伟, 杨锐. 冷旋锻变形对TB9钛合金显微组织和拉伸性能的影响[J]. 金属学报, 2019, 55(4): 480-488.
Dechun REN, Huhu SU, Huibo ZHANG, Jian WANG, Wei JIN, Rui YANG. Effect of Cold Rotary-Swaging Deformation on Microstructure and Tensile Properties of TB9 Titanium Alloy. Acta Metall Sin, 2019, 55(4): 480-488.

链接本文:

http://www.ams.org.cn/CN/10.11900/0412.1961.2018.00241      或      http://www.ams.org.cn/CN/Y2019/V55/I4/480

图1  TB9钛合金固溶态样品的OM像、TEM像和SAED花样及EBSD分析
图2  TB9钛合金冷旋锻变形前后大角度晶界和小角度晶界所占比例
图3  TB9钛合金冷旋锻变形后显微组织OM像和EBSD分析
图4  冷旋锻变形前后TB9钛合金的XRD谱
图5  冷旋锻变形后TB9钛合金显微组织的TEM像和70%冷旋锻变形量时的SAED花样
图6  冷旋锻变形量70%时的EBSD衬度对比及取向分布
图7  冷旋锻变形态TB9钛合金的极图
图8  固溶态及冷旋锻变形态TB9钛合金的取向分布函数(ODF)图 (φ2=45o)
图9  TB9钛合金室温应力-应变曲线

Rotary-swaging rate

%

Rp0.2

MPa

Rm

MPa

A

%

Z

%

0890.5896.028.863.0
10962.0963.510.457.0
151045.01049.514.357.0
201087.01089.511.456.0
251128.51130.08.148.0
301146.01152.07.747.5
351206.01210.59.450.5
401191.51192.09.250.0
701350.01350.57.943.5
表1  不同冷旋锻变形量下TB9钛合金室温拉伸性能
图10  旋锻变形态TB9钛合金晶粒尺寸分布
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