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在Q235A基体上采用药芯焊丝埋弧焊和自保护明弧焊方式,依次堆焊包含“20Cr2Mn12Ni Mo N韧性过渡层+Cr12W3Mn塑性缓冲层+Cr20Ti Mn Si高铬耐磨层”结构的堆焊合金。借助光学显微镜、扫描电镜、X线衍射仪和显微硬度计等研究堆焊合金层的界面组织特征及性能。结果表明,增加韧性过渡层和塑性缓冲层形成了梯度硬度结构的堆焊合金层,不仅可减小残余应力,而且抑制母材成分的稀释影响,规避网状碳化物和共晶等脆性组织形成。
In the Q235A matrix using flux-cored wire submerged arc welding and self-protection Ming arc welding, followed by surfacing welding containing “20Cr2Mn12Ni Mo N toughness transition layer Cr12W3Mn plastic buffer + Cr20Ti Mn Si high chromium wear-resistant layer ” structure of the pile Welding alloy. With the help of optical microscope, scanning electron microscope, X-ray diffractometer and microhardness tester, the interface microstructure and properties of surfacing alloy layer were studied. The results show that the addition of ductile transitional layer and plastic buffer layer to form a hardfacing alloy layer with gradient hardness structure can not only reduce the residual stress but also inhibit the dilution effect of base metal components and avoid the formation of brittle microstructure such as network carbides and eutectic .