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本文在热作模具钢(H13)表面通过预置超细碳化钨合金层,通过高功率连续CO2宽带激光处理预置表面获得熔覆层。采用光学显微镜和扫描电子显微镜(SEM)观察了熔覆层组织形貌,用X射线衍射仪(XRD)进行熔覆层物相分析,用X射线应力仪进行残余应力分析。测试了处理前后熔覆层显微硬度、耐磨性以及残余应力的变化。结果表明:激光处理后,表面平整光滑,组织细密,熔覆层组织由等轴晶、柱状树枝晶、细小的胞状晶和平面晶的结合带组成,厚度约为0.4mm,表面残余压应力得到显著提高,硬度为基体的1.8倍,耐磨性得到较大的提高。
In this paper, the surface of hot work die steel (H13) by pre-ultrafine tungsten carbide layer, high-power continuous CO2 laser processing of the pre-surface laser cladding. The morphology of the cladding layer was observed by optical microscope and scanning electron microscope (SEM). The phase structure of the cladding layer was analyzed by X-ray diffraction (XRD) and the residual stress was analyzed by X-ray stress meter. The changes of microhardness, wear resistance and residual stress of the coating before and after the treatment were tested. The results show that the surface of laser cladding is smooth and the microstructure is fine. The microstructure of cladding layer consists of equiaxed grains, columnar dendrites, fine cell crystals and planar crystal. The thickness is about 0.4mm and the surface residual compressive stress Significantly improved, the hardness of 1.8 times the substrate, wear resistance has been greatly improved.