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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Mechanical Properties of Rapidly Cooled Friction Stir Welded Ti-6Al-4V Alloys
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Microstructure and Mechanical Properties of Rapidly Cooled Friction Stir Welded Ti-6Al-4V Alloys

机译：快速冷却摩擦搅拌焊接Ti-6Al-4V合金的组织和力学性能

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摘要

Two mm-thick Ti-6Al-4V alloy plates were friction stir butt welded under natural- and rapid-cooling conditions. The microstructures and mechanical properties of joints were investigated and compared. The rapid cooling via spraying cooling liquid nitrogen on the plate top surface was beneficial to obtaining a narrower cross section and finer and more uniform grains in the stir zone than those obtained by natural cooling. Joint tensile strength of 1021 MPa and elongation of 1.88% under the rapid-cooling condition respectively reached 102.7 and 150.4% of those under the natural-cooling condition, respectively. The uniform-and-compact equiaxed grains led to equiaxed dimples on the fracture surface, which demonstrated a ductile fracture of the welding joints.
机译：在天然和快速冷却条件下，两毫米厚的Ti-6AL-4V合金板摩擦搅拌焊接焊接。 研究了关节的微观结构和力学性能和比较。 通过喷涂冷却液氮在板上表面上的快速冷却有利于获得较窄的横截面和更细，更细，更均匀的晶粒在搅拌区中的比通过天然冷却所获得的薄片。 在快速冷却条件下，环节拉伸强度为1021MPa和1.88％的伸长率分别达到自然冷却条件下的102.7％和150.4％。 均匀和紧凑的等轴晶粒导致断裂表面上的等轴凹槽，其展示了焊接接头的延性断裂。

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