TC4钛合金棒材挤压拉拔的金相组织和力学性能演变过程探究  

Study on microstructure and mechanical properties evolution process in the extrusion-drawing for titanium alloy TC4 bar

作　　者：崔文俊 郭柏兰 崔斌 王连珍 郭金斗 

机构地区：[1]西安赛特思迈钛业有限公司,陕西西安710021

出　　处：《锻压技术》2017年第10期166-169,共4页Forging & Stamping Technology

基　　金：陕西省工业科技攻关项目(2016GY-244)

摘　　要：为实现钛合金的晶粒细化以及批量生产的目的,采用挤压拉拔装置对TC4钛合金棒材进行加工,采用光学显微镜观察各模次的金相组织特征,结果表明,经过多道次的挤压拉拔后,棒材断面的金相组织细小,α和β晶粒达到再破碎的目的,最终的金相组织达到了最高的标准要求。对挤压拉拔的每个模次进行拉伸实验,发现屈服强度和抗拉强度随拉拔模次的增加而升高,而断后伸长率和断面收缩率却变化很小。在单模次挤压拉拔变径量不变的情况下,随挤压拉拔模次增多,加工硬化效果更为明显。综合以上分析,在TC4钛合金棒材生产过程中加入挤压拉拔能够有效地提高棒材的组织与性能。The titanium alloy TC4 bar was produced by the extrusion-drawing device in order to realize fine grain and mass production, and its microstructure of every pass was observed by optical microscope. The results show that after multiple passes of extrusion-drawing, the microstructure on the cross section of titanium alloy bar appears small c- and [3 grains to achieve the purpose of breaking, and the mi- crostructure meets the highest requirements at last. Then, the tensile test of every pass of extrusion-drawing is conducted, and the material yield strength and tensile strength increase with the increasing of extrusion-drawing passes, while the elongation percentage after fracture and the reduction percentage of cross section change very little. However, when the extrusion diameter of single pass extrusion-drawing re- mains the same, the hardening effect is more obvious with the increasing of processing passes. From the above analysis, the extrusion- drawing process in the titanium alloy TC4 bar production can effectively strengthen the microstructure and enhance the properties.

关 键 词：TC4钛合金 挤压拉拔 晶粒细化 金相组织 力学性能 加工硬化 

分 类 号：TG146.23[一般工业技术—材料科学与工程]