Research on the Heat Treatment Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Fabricated by Laser Arc Composite Additive Manufacturing

PAN Yanfei; WANG Lin; XU Jian; LI Zhongshu

doi:10.7512/j.issn.1001-2303.2024.10.01

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Research on the Heat Treatment Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Fabricated by Laser Arc Composite Additive Manufacturing
Vol. 54, Issue 10, Pages: 1-9(2024)
Published： 25 October 2024 ，
DOI： 10.7512/j.issn.1001-2303.2024.10.01
稿件说明：

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潘艳飞，王琳，许健，等.激光-电弧复合增材制造Ti-6Al-4V合金热处理组织及力学性能研究［J］.电焊机，2024，54（10）：1-9.

PAN Yanfei, WANG Lin, XU Jian, et al.Research on the Heat Treatment Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Fabricated by Laser Arc Composite Additive Manufacturing[J].Electric Welding Machine, 2024, 54(10): 1-9.
潘艳飞，王琳，许健，等.激光-电弧复合增材制造Ti-6Al-4V合金热处理组织及力学性能研究［J］.电焊机，2024，54（10）：1-9. DOI： 10.7512/j.issn.1001-2303.2024.10.01.

PAN Yanfei, WANG Lin, XU Jian, et al.Research on the Heat Treatment Microstructure and Mechanical Properties of Ti-6Al-4V Alloy Fabricated by Laser Arc Composite Additive Manufacturing[J].Electric Welding Machine, 2024, 54(10): 1-9. DOI： 10.7512/j.issn.1001-2303.2024.10.01.

摘要

本文研究了不同热处理制度对激光-电弧复合增材制造Ti-6Al-4V合金微观组织及力学性能的影响，借助光学显微镜和扫描电镜分析了热处理参数变化时微观组织的变化，探究了不同固溶温度和冷却速度下试样力学性能变化的原因。结果表明：激光-电弧复合增材制造Ti-6Al-4V合金的微观结构主要由魏氏α板条组织和沿沉积方向从基体向外延生长柱状β晶粒内少量针状α相构成。经固溶时效热处理后组织主要为典型的交错网篮组织，α板条厚度明显降低，试样塑性、韧性提高明显。当固溶时效热处理方案为950 ℃/1 h，AC+540 ℃/6 h，AC时，与沉积态试样相比，晶粒尺寸减小了一半，可获得较好的综合力学性能，建议采用此热处理方案。

Abstract

This article investigated the effects of different heat treatment regimes on the microstructure and mechanical properties of Ti-6Al-4V alloy fabricated by laser arc composite additive manufacturing. The changes in microstructure under different heat treatment parameters were analyzed using optical microscopy and scanning electron microscopy

and the reasons for the changes in mechanical properties of the samples under different solid solution temperatures and cooling rates were explored. The results showed that the microstructure of Ti-6Al-4V alloy fabricated by laser arc composite additive was mainly composed of Widmanstein Flat noodles structure and a small amount of acicular α phase in columnar β grain extending outward from the substrate along the deposition direction. After solution aging heat treatment

the microstructure was mainly a typical interlaced basket structure

the thickness of Flat noodles was significantly reduced

and the plasticity and toughness of the sample were significantly improved. When the solution aging heat treatment scheme was 950 ℃/1 h

AC+540 ℃/6 h

compared with the deposited sample

the grain size was reduced by 2 times and better comprehensive mechanical properties could be obtained. It was recommended to adopt this heat treatment scheme.

关键词

复合增材制造Ti-6Al-4V合金热处理微观组织力学性能

Keywords

composite additive manufacturingTi-6Al-4V alloyheat treatmentmicrostructuremechanical property

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