摘要:
以填充自制药芯铝焊丝的形式向熔池内部直接添加Ti,Al,Si,Mg等金属元素,用氩氮混合等离子气体对SiCp/Al基复合材料进行等离子弧原位焊接.分析了Ti-Al-Si-Mg以及它们的氧化物对焊缝组织和性能的影响.结果表明,以Ti-Al-Si-Mg作为原位反应填充材料,可以有效抑制针状脆生相Al4C3的生成,改善熔池流动性,增加熔池内部金属的润湿性.形成了稳定的熔池,得到了以TiN,AlN,TiC,MgAl2O4和细小棒状的Al3Ti等为增强相的焊缝.焊缝组织致密结合良好,其最大抗拉强度为267 MPa.
Abstract:
The influences of Ti-Al-Si-Mg and its oxides on microstructures and mechanical properties of SiCp/Al MMCs joints welded by plasma arc in-suit welding were investigated,in which argon-nitrogen mixture was used as plasma gases and Ti-Al-Si-Mg flux-cored wire as filled composites.The results show that the formation of needle-like harmful phases Al4C3 is effectively inhibited by adding Ti-Al-Si-Mg flux-cored wire as filler.The fluidity and wettability of molten pool is improved and the stable molten pool is obtained.The mechanical properties of welded joint are effectively enhanced by the compact-grain structure and the new reinforced composites such as TiN,AlN,TiC,MgAl2O4 and fine grain Al3Ti.The test results of mechanical properties show that the maximum tensile strength of welded joint with Ti-Al-Si-Mg flux-cored wire as filled composite reach up to 267 MPa.
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