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采用BNi-2镍基钎料对304奥氏体不锈钢在950、1050、1150℃温度条件进行氩气保护钎焊,通过金相显微镜、扫描电镜及万能试验机等对钎焊接头显微组织、钎缝元素分布及剪切性能进行了测试。结果表明:钎缝组织由Ni基固溶体和Cr_2B化合物构成,随着温度升高,钎料中B元素向母材扩散愈充分,界面处沿晶析出Ni_3B。在1050℃条件下,钎缝处固溶体相增多,塑性变形能力增强,最大剪切强度值为92 N/mm~2。
BNi-2 Ni-based brazing filler metal was used to braze 304 austenitic stainless steel under the conditions of 950, 1050 and 11500 ℃. The microstructure of the brazed joints was observed by metallographic microscope, scanning electron microscopy and universal testing machine. Brazing seam elemental distribution and shear properties were tested. The results show that the microstructure of the brazing seam is composed of Ni-based solid solution and Cr 2 B compound. With the increase of temperature, the B element in the brazing filler is more diffused into the base metal, and Ni_3B precipitates along the interface. Under the condition of 1050 ℃, the solid solution phase in the brazing seam increases, and the plastic deformation capacity increases with the maximum shear strength of 92 N / mm ~ 2.