不同热处理对激光定向能量沉积技术+锻造复合制造TC4钛合金组织与力学性能研究

doi:10.3901/JME.2023.15.304

机械工程学报 ›› 2023, Vol. 59 ›› Issue (15): 304-310.doi: 10.3901/JME.2023.15.304

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不同热处理对激光定向能量沉积技术+锻造复合制造TC4钛合金组织与力学性能研究

徐伟伟¹, 高川云¹, 张道洋², 陶常安², 成靖¹, 冉先喆², 汤海波^2,3, 刘栋^2,3

1. 航空工业成都飞机工业(集团)有限责任公司成都 610092;
2. 北京航空航天大学大型金属构件增材制造国家工程实验室北京 100191;
3. 北京煜鼎增材制造研究院有限公司北京 100096

收稿日期:2022-12-16 修回日期:2023-05-12 出版日期:2023-08-05 发布日期:2023-09-27
通讯作者: 刘栋(通信作者),男,1981年出生,博士,高级工程师。主要研究方向为钛合金大型复杂整体承力构件激光增材制造工艺。E-mail:09294@buaa.edu.cn
作者简介:徐伟伟,男,1988年出生,硕士,工程师。主要研究方向为增材制造技术。E-mail:demon0926@126.com
基金资助:
国家重点研发计划(2016YFB1100400)和国家自然科学基金(51775018)资助项目

Study of Different Heat Treatments on the Microstructure and Mechanical Properties of TC4 Titanium Alloy Manufactured by Hybrid Manufacturing Technology

XU Weiwei¹, GAO Chuanyun¹, ZHANG Daoyang², TAO Changan², CHENG Jing¹, RAN Xianzhe², TANG Haibo^2,3, LIU Dong^2,3

1. AVIC Chengdu Aircraft Industry(Group) Co., Ltd., Chengdu 610092;
2. National Engineering Laboratory of Additive Manufacturing for Large Metallic Components, Beihang University, Beijing 100191;
3. Beijing Yuding Additive Manufacturing Research Institute Co., Ltd., Beijing 100096

Received:2022-12-16 Revised:2023-05-12 Online:2023-08-05 Published:2023-09-27

摘要/Abstract

摘要： 研究激光定向能量沉积+锻造技术复合制造Ti-6Al-4V(TC4)钛合金热影响区组织演变规律,分析对比三种热处理后:复合制造TC4钛合金的组织特征和力学性能。结果表明,复合制造试样可以分为锻造区、热影响区和增材区三个显微组织不同的区域。热影响区的显微组织形貌具有双态组织和网篮组织的双重特征,锻造侧热影响区的等轴α相在热输入的影响下发生长大,含量明显增加,而增材区侧热影响区形成了大量的细小层状α相。经600℃及800℃退火后试样热影响区中α板条宽度相近,但800℃退火工艺试样的热影响区中存在部分等轴α相,经975℃双重退火工艺使得热影响区晶粒发生明显粗化。热影响区硬度平均值约为394 HV,明显高于锻造区的322 HV和增材区的340 HV。在相同热处理工艺下,复合制造TC4钛合金试样的力学强度性能高于同等工艺参数增材制造TC4试样和标准TC4锻件的性能,但断后延伸率较增材试样低约31%。在热处理工艺方面,600℃退火试样的力学强度性能最优,较975℃双重退火试样屈服强度升高了约41 MPa,且三种热处理试样的断后伸长率与面缩率差异很小。

关键词: TC4钛合金, 激光定向能量沉积, 复合制造, 热处理, 显微组织, 力学性能

Abstract: The tissue evolution of the heat-affected zone of Ti-6Al-4V (TC4) titanium alloy composite fabricated by laser-directed energy deposition + forging technology is studied, and the tissue characteristics and mechanical properties of the three post:composite fabricated TC4 titanium alloys after heat treatment are analyzed and compared. The results show that the composite fabricated specimens can be divided into three regions with different microstructures in the forging zone, heat-affected zone and additive zone. The microstructure morphology of the heat-affected zone has the dual characteristics of bimorphic and mesh basket organization. The isometric α-phase in the heat-affected zone on the forging side grows under the influence of heat input and the content increases significantly, while a large number of fine lamellar α-phase is formed in the heat-affected zone on the additive zone side. The width of α slats in the heat-affected zone of the specimens after annealing at 600℃ and 800℃ are similar, but some equiaxed α phases existed in the heat-affected zone of the specimens annealed at 800℃, and the double annealing process at 975℃ caused significant coarsening of the grains in the heat-affected zone. Under the same heat treatment process, the mechanical strength properties of the composite fabricated TC4 titanium alloy specimens are higher than those of the standard TC4 forgings and TC4 specimens fabricated with the same process parameters, but the post-fracture elongation is about 31% lower than that of the fabricated specimens. In the heat treatment process, the best mechanical strength properties are obtained for the 600℃ annealed specimens, and the yield strength is increased 41 MPa compared with the 975℃ double annealed specimens, and the differences in post-extension and face shrinkage between the three heat treatment specimens are small.

Key words: TC4 titanium alloy, laser-directed energy deposition, hybrid manufacturing, heat treatment, microstructure, mechanical properties

中图分类号:

O436

徐伟伟, 高川云, 张道洋, 陶常安, 成靖, 冉先喆, 汤海波, 刘栋. 不同热处理对激光定向能量沉积技术+锻造复合制造TC4钛合金组织与力学性能研究[J]. 机械工程学报, 2023, 59(15): 304-310.

XU Weiwei, GAO Chuanyun, ZHANG Daoyang, TAO Changan, CHENG Jing, RAN Xianzhe, TANG Haibo, LIU Dong. Study of Different Heat Treatments on the Microstructure and Mechanical Properties of TC4 Titanium Alloy Manufactured by Hybrid Manufacturing Technology[J]. Journal of Mechanical Engineering, 2023, 59(15): 304-310.

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不同热处理对激光定向能量沉积技术+锻造复合制造TC4钛合金组织与力学性能研究

Study of Different Heat Treatments on the Microstructure and Mechanical Properties of TC4 Titanium Alloy Manufactured by Hybrid Manufacturing Technology

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