不同热处理对激光定向能量沉积制造TC4钛合金组织和拉伸性能的影响

doi:10.3901/JME.2024.20.099

机械工程学报 ›› 2024, Vol. 60 ›› Issue (20): 99-107.doi: 10.3901/JME.2024.20.099

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不同热处理对激光定向能量沉积制造TC4钛合金组织和拉伸性能的影响

荣鹏¹, 成靖¹, 邓鸿文², 陶常安², 高川云¹, 冉先喆², 程序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:2023-09-06 修回日期:2024-04-17 出版日期:2024-10-20 发布日期:2024-11-30
通讯作者: 刘栋,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:荣鹏,男,1989年出生,博士,工程师。主要研究方向为增材制造技术。E-mail:rongpeng-love@163.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。

Effect of Different Heat Treatments on Microstructure and Tensile Properties of TC4 Titanium Alloy Fabricated by Laser Directed Energy Deposition

RONG Peng¹, Cheng Jing¹, DENG Hongwen², TAO Changan², GAO Chuanyun¹, RAN Xianzhe², CHENG Xu², 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:2023-09-06 Revised:2024-04-17 Online:2024-10-20 Published:2024-11-30

摘要/Abstract

摘要： 激光定向能量沉积技术(Directed energy deposition,DED)是一种逐点逐层熔化沉积从而直接制造致密金属零件的高性能加工成形技术。由于其制造的TC4钛合金的显微组织与传统锻件有很大的不同，选用合适的热处理工艺是改善其力学性能的关键。因此，研究了三种不同热处理制度对DED制造TC4钛合金对成形构件晶粒形貌、显微组织和室温以及高温拉伸性能的影响。研究结果表明，经过600℃和800℃退火处理后，α片层均出现不同程度的粗化，且α相含量略微提高，经975℃双重退火处理后生成了部分等轴α相，室温拉伸塑性得到改善，与800℃退火处理试样相比，横向面缩率增加了约26.1%。在400℃高温拉伸时，975℃双重退火后的合金具有最高的横向平均高温断后伸长率，表现出优异的高温强度-塑性匹配。

关键词: 增材制造, 激光定向能量沉积, Ti-6Al-4V, 显微组织, 室温性能, 高温性能

Abstract: Laser directed energy deposition (DED) is a manufacturing technology for producing high performance fully dense near-net metallic components, which is melting metal powders point by point and stacking them layer by layer. Since the microstructure of DEDed TC4 titanium alloy is different from that made by traditional forging, selecting appropriate heat treatment process can improve its mechanical properties significantly. The effects of three different heat treatment on microstructure morphologies and tensile properties of DEDed TC4 alloy were investigated. The results show that after 600 ℃ and 800 ℃ annealing treatment, the α lamellae coarsens to different degrees, and the volume fraction of α phase increases slightly. The double annealing heat treatment at 975 ℃ results in the appearance of equiaxed α phase, improving room-temperature plasticity with about 26.1% higher in average transverse reduction of area than that after 800 ℃ annealing treatment. After double annealing heat treatment at 975 ℃, TC4 alloy has the highest transverse average elongation at high temperature tensile test at 400℃, showing excellent high temperature strength-plastic balance.

Key words: additive manufacturing, laser directed energy deposition, Ti-6Al-4V, microstructure, room-temperature property, high-temperature behavior

中图分类号:

TG166

荣鹏, 成靖, 邓鸿文, 陶常安, 高川云, 冉先喆, 程序, 汤海波, 刘栋. 不同热处理对激光定向能量沉积制造TC4钛合金组织和拉伸性能的影响[J]. 机械工程学报, 2024, 60(20): 99-107.

RONG Peng, Cheng Jing, DENG Hongwen, TAO Changan, GAO Chuanyun, RAN Xianzhe, CHENG Xu, TANG Haibo, LIU Dong. Effect of Different Heat Treatments on Microstructure and Tensile Properties of TC4 Titanium Alloy Fabricated by Laser Directed Energy Deposition[J]. Journal of Mechanical Engineering, 2024, 60(20): 99-107.

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不同热处理对激光定向能量沉积制造TC4钛合金组织和拉伸性能的影响

Effect of Different Heat Treatments on Microstructure and Tensile Properties of TC4 Titanium Alloy Fabricated by Laser Directed Energy Deposition

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