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首页> 中文期刊> 《中国有色金属学报（英文版）》 >采用BNi-2钎焊合金和搅拌摩擦加工提高双向不锈钢与铝合金的脉冲激光焊接性能

采用BNi-2钎焊合金和搅拌摩擦加工提高双向不锈钢与铝合金的脉冲激光焊接性能

         
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摘要

研究激光脉冲距离和5456铝合金强化对其与双相不锈钢(DSS)板激光焊接性能的影响.首先,采用镍基BNi-2钎焊粉通过搅拌摩擦加工增强铝合金板;然后,将DSS板分别与Al5456铝合金板和Al5456/BNi-2复合材料进行激光焊接.采用扫描电镜、X射线衍射仪、显微硬度仪和剪切试验等方法对焊接区进行研究.结果显示,随着激光脉冲距离从0.2 mm增加到0.5 mm,焊接界面层从23μm减小到5μm.由于铝合金的增强相BNi-2向熔池中注入更多的镍,导致界面层的析出相由DSS/铝合金焊缝中的Al-Fe金属间化合物(IMCs)转变为DSS/Al复合材料焊缝中的Al-Ni-Fe金属间化合物(IMCs),因此,焊缝裂纹倾向显著降低,界面层硬度由～950 HV降低到～600 HV.与DSS/Al焊缝相比,DSS/Al复合材料焊缝的剪切强度提高～150％,从46 MPa提高到114 MPa.%Effects of laser pulse distance and reinforcing of 5456 aluminum alloy were investigated on laser weldability of Al alloy to duplex stainless steel (DSS) plates. The aluminum alloy plate was reinforced by nickel-base BNi-2 brazing powder via friction stir processing. The DSS plates were laser welded to the Al5456/BNi-2 composite and also to the Al5456 alloy plates. The welding zones were studied by scanning electron microscopy, X-ray diffractometry, micro-hardness and shear tests. The weld interface layer became thinner from 23 to 5 μm, as the laser pulse distance was increased from 0.2 to 0.5 mm. Reinforcing of the Al alloy modified the phases at interface layer from Al-Fe intermetallic compounds (IMCs) in the DSS/Al alloy weld, to Al-Ni-Fe IMCs in the DSS/Al composite one, since more nickel was injected in the weld pool by BNi-2 reinforcements. This led to a remarkable reduction in crack tendency of the welds and decreased the hardness of the interface layer from ～950 HV to ～600 HV. Shear strengths of the DSS/Al composite welds were significantly increased by ～150％, from 46 to 114 MPa, in comparison to the DSS/Al alloy ones.

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