Microstructure evolution and fatigue crack growth of diffusion bonded Ti-6Al-4V titanium alloy

被引：21

作者：

Li, Tianle ^{[1
]}

Zhong, Lixin ^{[2
]}

Wu, Huiping ^{[1
]}

An, Dayong ^{[1
]}

Li, Xifeng ^{[1
]}

Chen, Jun ^{[1
]}

机构：

[1] Shanghai Jiao Tong Univ, Inst Forming Technol & Equipment, Sch Mat Sci & Engn, Shanghai 200030, Peoples R China

[2] AV Xian Aircraft Ind Grp Co Ltd, Xian 710089, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2022年 / 918卷

基金：

中国国家自然科学基金;

关键词：

Ti-6Al-4 V alloy; Diffusion bonding; Fatigue crack growth; grain; Crystal orientation; CRYSTALLOGRAPHIC ORIENTATION; PROPAGATION; BEHAVIOR; MICROTEXTURE; STEEL;

D O I：

10.1016/j.jallcom.2022.165816

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Microstructure evolution and fatigue crack growth (FCG) behaviors of diffusion bonded Ti-6Al-4 V titanium alloy with synchronously changed temperature and pressure are systematically investigated. Ti-6Al-4 V alloy plates can be metallurgically bonded under suitable process parameters. Meanwhile, bonded plates displayed different FCG resistance and excellent tensile properties at room temperature. FCG life of the 780-18 (bonded temperature-pressure) sample from a crack length of 0.5 mm to fracture is 108147 cycles, which is 1.6 and 1.84 times than that of the 830-12 and 900-6 samples, respectively. According to the observation of crack paths and alpha grain crystallography before and after fatigue tests, fatigue crack propagation is mainly affected by the alpha crystallographic orientation, alpha grain size, and beta phase. By choosing higher pressure (18 MPa) to promote bonding and lower temperature (780 oC) to optimize the microstructures, diffusion bonded Ti-6Al-4 V alloy can be achieved outstanding FCG resistance with uncompromised tensile properties in this study. (c) 2022 Elsevier B.V. All rights reserved.

引用

页数：11

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