Ti-6Al-4V合金的轧制与组织性能

doi:10.13251/j.issn.0254-6051.2020.01.043

金属热处理 ›› 2020, Vol. 45 ›› Issue (1): 222-227.DOI: 10.13251/j.issn.0254-6051.2020.01.043

Ti-6Al-4V合金的轧制与组织性能

朱霞^1,2, 董俊慧², 罗志锋²

1. 内蒙古机电职业技术学院, 内蒙古呼和浩特 010070;
2. 内蒙古工业大学材料科学与工程学院, 内蒙古呼和浩特 010051

收稿日期:2019-06-28 出版日期:2020-01-25 发布日期:2020-04-03
作者简介:朱霞(1977—),女,博士,副教授,主要研究方向为材料加工,联系电话:15904896113,E-mail:2079303417@qq.com。

Rolling, microstructure and properties of Ti-6Al-4V alloy

Zhu Xia^1,2, Dong Junhui², Luo Zhifeng²

1. Inner Mongolia Technical College of Mechanics and Electrics, Hohhot Inner Mongolia 010070, China;
2. School of Materials Science and Engineering, Inner Mongolia University of Technology, Hohhot Inner Mongolia 010051, China

Received:2019-06-28 Online:2020-01-25 Published:2020-04-03

摘要/Abstract

摘要： 采用光学显微镜、透射电镜和拉伸试验等手段,研究了多道次两向轧制和单向轧制对不同原始状态(热轧态、水淬态和空冷态)Ti-6Al-4V合金显微组织和力学性能的影响。结果表明,热轧态Ti-6Al-4V合金的组织为片状α相+β相+少量等轴α相,水淬态Ti-6Al-4V合金形成了针状马氏体组织,空冷态Ti-6Al-4V合金形成了网状组织。Ti-6Al-4V合金适宜的两向轧制温度为700 ℃,此时合金中可见颗粒状β相弥散分布在α基体上。两向轧制Ti-6Al-4V合金的抗拉强度和屈服强度从高至低顺序为:水淬态>热轧态>空冷态,且轧向强度要高于横向;相较于单向轧制,两向轧制明显降低了Ti-6Al-4V合金板材拉伸性能的各向异性,且水淬态Ti-6Al-4V合金的轧向和横向强度差异最小,700 ℃轧制Ti-6Al-4V合金的主要细化机制为位错细化。

关键词: Ti-6Al-4V合金, 两向轧制, 单向轧制, 显微组织, 力学性能

Abstract: Effects of two-way rolling and one-way rolling on the microstructure and mechanical properties of Ti-6Al-4V alloys in different original states (hot-rolled, water-quenched and air-cooled) were studied by means of OM, TEM and tensile test. The results show that the microstructure of hot-rolled Ti-6Al-4V alloy is composed of flake-like α phase, β phase and a small amount of equiaxed α phase. The needle-like martensite is formed in water-quenched Ti-6Al-4V alloy and the net basket structure is formed in air-cooled Ti-6Al-4V alloy. The optimum two-way rolling temperature for Ti-6Al-4V alloy is 700 ℃, at which the granular β phase is dispersed on the matrix α. The order of tensile strength and yield strength of two-way rolling Ti-6Al-4V alloy from high to low is WQ>M>AC, and the strength in the rolling direction is higher than that in the transverse. Compared with unidirectional rolling, two-way rolling significantly reduces the anisotropy of tensile properties of Ti-6Al-4V alloy sheet, and the difference between the rolling and transverse strength of water-quenched Ti-6Al-4V alloy is the smallest, and the main refining mechanism of rolling Ti-6Al-4V alloy at 700 ℃ is the dislocation refine.

Key words: Ti-6Al-4V alloy, two-way rolling, one-way rolling, microstructure, mechanical properties

中图分类号:

TG146

朱霞, 董俊慧, 罗志锋. Ti-6Al-4V合金的轧制与组织性能[J]. 金属热处理, 2020, 45(1): 222-227.

Zhu Xia, Dong Junhui, Luo Zhifeng. Rolling, microstructure and properties of Ti-6Al-4V alloy[J]. HTM, 2020, 45(1): 222-227.

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Ti-6Al-4V合金的轧制与组织性能

Rolling, microstructure and properties of Ti-6Al-4V alloy

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