Effect of Heat treatment on Microstructure and Properties of EBW TC4 Titanium Alloy Joints

LIU Yongqiang; ZHUANG Mingxiang; ZHANG Wenliang; WANG Weixian

doi:10.7512/j.issn.1001-2303.2023.10.04

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Effect of Heat treatment on Microstructure and Properties of EBW TC4 Titanium Alloy Joints
Vol. 53, Issue 10, Pages: 22-27(2023)
Received：25 December 2022，

Revised：2023-05-30，

Published：25 October 2023
DOI： 10.7512/j.issn.1001-2303.2023.10.04
稿件说明：

移动端阅览

刘永强，庄明祥，章文亮，等.焊后消应力对TC4钛合金电子束焊接接头组织和性能的影响［J］.电焊机，2023，53（10）：22-27. DOI： 10.7512/j.issn.1001-2303.2023.10.04.

LIU Yongqiang, ZHUANG Mingxiang, ZHANG Wenliang, et al.Effect of Heat treatment on Microstructure and Properties of EBW TC4 Titanium Alloy Joints[J].Electric Welding Machine, 2023, 53(10): 22-27. DOI： 10.7512/j.issn.1001-2303.2023.10.04.

摘要

研究去应力退火和完全退火两种热处理状态下30 mm厚TC4钛合金电子束焊接接头的组织和性能。结果表明：两种热处理状态下，接头的组织构成类似，BW区以等轴α相+板条状α相与晶间β相组成的双相组织，HAZ区由初生α相、针状马氏体α′相以及板条状α相和β相的双相组织组成，WM区主要由大量的针状马氏体α′相和少量分布在原始β晶界的α相组成。与去应力退火状态相比，在完全退火状态下，接头整体组织更加均匀，α相球化程度更高，抗拉能力更强，抗冲击性能更弱。

Abstract

The microstructures and properties of EBW joint of 30 mm TC4 titanium alloy under two heat treatment conditions of stress relief annealing and full annealing were studied. The results show that the microstructure of the joint is similar under two heat treatment conditions. The BM is mainly composed of equiaxed α phase plus two-phase structure consisting of lath α phase and intercrystalline β phase

and the HAZ is composed of primary α phase

acicular martensite α ′ phase and two-phase structure consisting of lath α phase and intercrystalline β phase. The WM is mainly composed of a large number of acicular martensite α ′ phases and a small number of α phases distributed at the original β grain boundary. In the fully annealed state

the overall organization of the joint is more uniform and higher spheroidization of α phase，stronger tensile strength and weaker impact resistance

compared with the stress relieved annealed state.

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