Texture refinement and mechanical improvement in beam oscillation superimposed laser welding of TiAl-based alloy

被引：9

作者：

Liu, Jie ^{[1
,2
]}

Wang, Mengfei ^{[1
]}

Zhang, Peng ^{[2
]}

Chen, Yuhua ^{[3
]}

Wang, Shanlin ^{[3
]}

Wu, Tongli ^{[4
]}

Xie, Meirong ^{[5
]}

Wang, Li ^{[6
]}

Wang, Kehong ^{[1
]}

机构：

[1] Nanjing Univ Sci & Technol, Sch Mat Sci & Engn, Nanjing 210094, Peoples R China

[2] Inner Mongolia First Machinery Grp Co Ltd, Baotou 014030, Peoples R China

[3] Nanchang Hangkong Univ, Jiangxi Key Lab Forming & Joining, Technol Aerosp Components, Nanchang 330036, Peoples R China

[4] Nanjing Univ Sci & Technol, Sch Mech Engn, Nanjing 210094, Peoples R China

[5] Capital Aerosp Machinery Corp, Beijing 100076, Peoples R China

[6] Cent South Univ, State Key Lab Powder Met, Changsha 410083, Peoples R China

来源：

MATERIALS CHARACTERIZATION | 2022年 / 188卷

基金：

中国博士后科学基金;

关键词：

TiAl alloy; Laser beam oscillation; Grain refinement; Mechanical property improvement; GRAIN-REFINEMENT; PHASE-TRANSFORMATIONS; HEAT-TREATMENTS; BORON ADDITION; BETA-PHASE; HIGH NB; MICROSTRUCTURE; SITU; DEFORMATION; INSIGHTS;

D O I：

10.1016/j.matchar.2022.111892

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cracking and coarse textured grains are responsible for insufficient mechanical properties of laser beam welded TiAl alloys. Conventional method for grain refinement such as addition of boride is suppressed by high cooling rate during laser welding. This article delineates texture refinement by laser beam oscillation for TiAl alloy. Large textured grains are formed with no beam oscillation. When the oscillation increases to 300 Hz, the vortex and turbulence severely disturb the welding pool solidification and cause reduction of grain size down to 41% of the size without oscillation. The size of textured grain does not show a further reduction with 500 Hz oscillation. Both ultimate tensile strength and elongation are improved with refined grain size.

引用

页数：14

共 37 条

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