The relationship between the super plasticity of laser welding joint of titanium alloy and hydrogen treatment

4th International Conference on Advanced Composite Materials and Manufacturing Engineering 2017

材料科学;化学

Cao, Zean^1 ; Cheng, Donghai^1 ; Jiang, Xunyan^1 ; Hu, Dean^1 ; Chen, Yiping^1

Nanchang Hang Kong University, Nanchang, China^1

关键词: Base material;    Deformation temperatures;    Hydrogen contents;    Hydrogen treatments;    Laser welded joints;    Non-uniform deformation;    TC4 titanium alloy;    Welded plates;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/207/1/012065/pdf
DOI  :  10.1088/1757-899X/207/1/012065

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The superplastic deformation uniformity of laser welded joint of TC4 titanium alloy is improved by hydrogen treatment. The non-uniform deformation coefficient K was introduced to quantification ally characterize the non-uniform deformation. The results show when the content of hydrogen exceeds 0.29%, the super plasticity of the titanium alloy welded plate decreases with the increase of the hydrogen content. The decrease of the shrinkage of the base material is larger than that of the weld section with the increase of hydrogen content. The K can be used to describe the non-uniform deformation of the weld and the base material during the superplastic deformation of laser welded joint of the TC4. The K value increases with increaseing hydrogen content, increaseing deformation temperature and decreaseing strain rate. The K value reaches the maximum of 0.84 with hydrogen content of 1.299%, deformation temperature of 920 °C, strain rate of 10-4S-1.