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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructure and Mechanical Property Improvement in Laser-Welded TC4 Titanium Alloy and 301L Stainless Steel Joints Without Filler Metal
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Microstructure and Mechanical Property Improvement in Laser-Welded TC4 Titanium Alloy and 301L Stainless Steel Joints Without Filler Metal

机译：激光焊接TC4钛合金和301L不锈钢接头的微观结构和机械性能改进，无填充金属

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摘要

Pulsed laser welding of Ti alloy to stainless steel (SS) has been applied without filler metal. When the laser beam was focused on the Ti alloy-SS interface, large volumes of Ti-Fe intermetallics were formed in the joint. These Ti-Fe intermetallics were highly brittle, causing the joint to crack spontaneously after welding. The brittle coarse Ti-Fe intermetallics seriously deteriorates the joint strength of Ti alloy and SS; therefore, it is necessary to control the quantities and distributions of brittle Ti-Fe intermetallics in the joint. The amount of melted base materials was controlled by changing laser offset to control the melted proportion and thus control the quantity and distribution of brittle Ti-Fe intermetallics in weld. When laser beam was on the SS side, melting amount of Ti alloy in weld was decreased. When laser beam was on the Ti alloy side, melting amount of SS in weld was decreased. When the laser offset was 0.35mm away from SS side, the sample realizes the effective connection between Ti alloy and SS. A compound layer was formed at the SS side with the main microstructure of -Ti and TiFe2. The joint fractured at the compound layer with the maximum tensile strength of 182MPa. Microstructures and mechanical properties of joints were improved by changing laser offset.
机译：脉冲激光焊接Ti合金与不锈钢（SS）的不锈钢（SS）已经施加而没有填充金属。当激光束聚焦在Ti合金-SS界面上时，在接头中形成大量的Ti-Fe金属间金属间体积。这些Ti-Fe金属间金属间金属间质量非常脆，导致接头在焊接后自发裂纹。脆性粗型Ti-Fe金属间金属间金属间金属间金属间金属间隙严重劣化Ti合金和SS的关节强度;因此，有必要控制关节中脆性TI-FE金属间金属间金属间金属间金属间金属间质的量和分布。通过改变激光偏移来控制熔融比例来控制熔融的基础材料的量，从而控制焊缝中脆性Ti-Fe金属间金属间质量和分布。当激光束在SS侧时，焊缝中Ti合金的熔化量减少。当激光束在Ti合金侧时，焊缝中SS的熔化量减少。当激光偏移距离SS侧为0.35mm时，样品实现了Ti合金和SS之间的有效连接。在SS侧形成复合层，其具有-ti和Tife2的主要微观结构。在复合层处破裂的关节具有182MPa的最大拉伸强度。通过改变激光偏移来改善关节的微观结构和力学性能。

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