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将高硬压轮模具预热到450℃,采用专用的镍基碳化钨复合粉末,对硬度高达63 HRC的压轮进行了激光熔覆修复。利用光学显微镜、X-射线衍射仪与MM-200磨损试验机对激光熔覆Ni基WC涂层的显微组织与耐磨性能进行了研究。结果表明,激光熔覆Ni基WC涂层表面较平整、光滑,无气孔与裂纹,与高硬压轮模具呈冶金结合,碳化钨颗粒在涂层内分布较均匀,发生溶解扩散式烧损后,析出形貌复杂的碳化物,如M6C、M12C与M23C6,耐磨性能相对于高硬压轮模具提高了约1.5倍。
The high pressure roller die preheated to 450 ℃, the use of special nickel-based tungsten carbide powder composite, the hardness of up to 63 HRC pressure roller laser cladding repair. The microstructure and wear resistance of laser cladding Ni-based WC coating were studied by optical microscope, X-ray diffraction and MM-200 wear tester. The results show that the surface of laser cladding Ni-based WC coating is smooth, smooth and free of pores and cracks. It is metallurgically bonded to the die of high hardness and pressure die. The tungsten carbide particles are distributed uniformly in the coating and dissolved and diffused , Precipitated complex morphology carbides, such as M6C, M12C and M23C6, wear resistance relative to the high pressure roller die increased about 1.5 times.