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首页> 外文期刊>Applied Surface Science >The surface modified composite layer formation with boron carbide particles on magnesium alloy surfaces through pulse gas tungsten arc treatment
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The surface modified composite layer formation with boron carbide particles on magnesium alloy surfaces through pulse gas tungsten arc treatment

机译：脉冲钨极电弧处理在镁合金表面形成碳化硼颗粒的表面改性复合层。

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摘要

A novel fabrication process of surface modified composite layer by pulse current gas tungsten arc (GTA) surface modification process was used to deposit B_4C particles on the surface of magnesium alloy AZ31. This method is an effective technique in producing a high performance surface modified composite layer. During the pulse current GTA surface modification process, considerable convection can exist in the molten pool due to various driving forces and the pulse current could cause violent stirring in the molten pool, and the large temperature gradient across the boundary between the GTA modified surface and matrix metal resulted in rapid resolidification with high cooling rates in the molten pool, so that the process result notable grain refinement in the GTA surface modified composite layer. The hardness and wear resistance of the GTA surface modified composite layer are superior to that of as-received magnesium alloy AZ31. The hardness values and wear resistance of GTA surface modified composite layer depend on the GTA process parameters and the B_4C particles powder concentration and distribution. The optimum processing parameters for the formation of a homogeneous crack/defect-free and grain refinement microstructure were established.
机译：采用脉冲电流气体钨极电弧（GTA）表面改性工艺制备表面改性复合层的新工艺，将B_4C颗粒沉积在镁合金AZ31的表面。该方法是生产高性能表面改性复合层的有效技术。在脉冲电流GTA表面改性过程中，由于各种驱动力，熔池中可能存在相当大的对流，并且脉冲电流可能会在熔池中引起剧烈搅拌，并且在GTA改性表面和基体之间的边界处会出现较大的温度梯度金属会在熔池中以高冷却速率快速重新凝固，因此该工艺可在GTA表面改性的复合层中显着改善晶粒。 GTA表面改性的复合层的硬度和耐磨性优于刚收到的镁合金AZ31。 GTA表面改性复合层的硬度值和耐磨性取决于GTA工艺参数以及B_4C颗粒粉末的浓度和分布。建立了形成均匀无裂纹/无缺陷和细化晶粒的最佳工艺参数。

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