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为了研究焊接接头的渗硼层组织形态与力学性能,本文对焊缝区和热影响区的渗硼层做了金相与电子金相分析,也做了静动载荷力学性能试验。结果发现,在焊缝的熔池边缘区域,由于渗硼层被加热熔化后,冷却结晶而形成的共晶化组织。试验结果证明,焊缝热影响区的层硼层组织形态不变,半熔化区渗硼层的针形体,部份保留下来,研究认为其共晶化组织为Fe—B共晶系,其中共晶组织具有复杂规则的形态,並带有定向凝固的特性。试验结果也表明,渗硼的零件具有可焊性,焊缝热影响区仍具有渗硼层很高的硬度和耐磨性。
In order to study the microstructure and mechanical properties of boronizing layer in welded joints, metallographic and electronic metallographic analysis of the boronizing layer in the weld zone and the heat affected zone was done. The static and dynamic mechanical properties tests were also done. As a result, it has been found that in the edge region of the weld pool, the eutectic structure is formed by cooling and crystallizing the boronizing layer after being heated and melted. The experimental results show that the morphology of the boron layer in the HAZ of the weld is constant, and the needle-shaped body of the boronized layer in the semi-molten zone remains partially. The eutectic structure of the weld is considered to be Fe-B eutectic. Crystallography has a complex and regular morphology with directional solidification properties. The test results also show that the boronized parts are solderable and the HAZ of the weld seam still has a high hardness and wear resistance of the boronizing layer.