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Joint strength and microstructures of brazed joints of stainless steel with Fe-based filler

机译：不锈钢与铁基钎料钎焊接头的接头强度和组织

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For thermal conversion parts of electrical equipment which are required high corrosion resistance, stainless steel is often used. The joining of such materials is generally conducted with brazing with Ni-based filler. Since Ni is a rare and high-cost material, the substitute filler material which is low-Ni or Ni-free is expected to be developed. Fe-based filler has been developed as one candidate. In this study, joint strength and the microstructure of stainless steel type 304 brazed joint with Fe-based filler were investigated. As the results, it was clarified that shear strength of the joint with Fe-based filler is the almost same level as that with conventional Ni-based filler. Moreover, the effect of joint clearance on the joint strength and the microstructure was also investigated. When joint clearance is more than 50 μm, the final solidified area which consists of Fe-Cr-Ni-Si phases and P-rich phases forms in the center of the brazed joint. The formation of P-rich phases causes the joint strength reduction.
机译：对于要求高耐腐蚀性的电气设备的热转换部件，通常使用不锈钢。这种材料的连接通常是通过与镍基填料的钎焊进行的。由于Ni是稀有且成本高的材料，因此有望开发出低Ni或无Ni的替代填充材料。铁基填料已被开发为一种候选材料。在这项研究中，研究了具有铁基填料的304不锈钢钎焊接头的接头强度和显微组织。结果表明，与铁基填料的接缝的剪切强度几乎与常规镍基填料的接缝强度相同。此外，还研究了接头间隙对接头强度和显微组织的影响。当接头间隙大于50μm时，在钎焊接头的中心形成由Fe-Cr-Ni-Si相和富P相组成的最终凝固区域。富P相的形成导致接头强度降低。

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