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通过调整激光重熔工艺参数对球墨铸铁进行表面重熔处理 ,获得了白口铸铁层 ,对熔化层的显微组织、力学性能、熔化层 基体界面特性与工艺参数的关系进行了仔细研究 ,结果表明 :快速加热熔化、快速冷却凝固和部分碳被烧损 ,使熔化表面凝固后获得白口铸铁层 ,构成了球墨铸铁与白口铸铁的复合材料 ;激光重熔处理后的白口铸铁层显微组织很细 ,具有高的强度和硬度 ,随着激光束扫描速度的增大 ,显微组织变细 ,硬度增高 ;熔化层的横截面积与激光束扫描速度之间在一定条件下接近双曲线关系。
By adjusting the laser remelting process parameters of the surface of the ductile iron remelting treatment to obtain a white cast iron layer, the melt layer of the microstructure, mechanical properties, melting layer substrate interface characteristics and process parameters were carefully studied the relationship between the results It shows that the rapid heating and melting, rapid cooling and solidification, and the partial burning of carbon make the molten surface solidified to obtain the white cast iron layer, forming the composite material of ductile iron and white cast iron. The white cast iron layer after laser remelting was obviously Micro-organization is very thin, with high strength and hardness, as the laser beam scanning speed increases, the microstructure becomes thinner, the hardness increases; the cross-sectional area of the melt layer and the laser beam scanning speed under certain conditions, close to double Curve relationship.