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采用横流CO2激光器对3Cr2W8V热作模具钢表面进行激光熔凝处理,然后对激光处理后的试样进行QPQ盐浴渗氮复合处理。用电子显微镜观察了复合处理后3Cr2W8V钢试样的金相组织,并通过划痕硬度试验和磨损试验测试了QPQ盐浴渗氮试样和经激光熔凝处理再进行QPQ盐浴渗氮试样的硬度和耐磨性。结果表明,经过激光熔凝处理的试样具有更好的渗氮效果,在渗氮时间相同的条件下,经激光熔凝处理再进行QPQ盐浴渗氮复合处理的试样渗氮层更深,划痕硬度和耐磨性较未采用激光处理直接渗氮的试样都有较大幅度地提高,其中划痕硬度平均提高了15.6%,耐磨性平均提高了47.9%。预先激光熔凝再盐浴渗氮的复合处理工艺可以较大幅度地提高工件表面的耐磨性。
The surface of 3Cr2W8V hot work die steel was fused by cross-flow CO2 laser, and the QPQ salt bath nitriding composite treatment was performed on the laser treated specimens. The microstructure of the 3Cr2W8V steel after the composite treatment was observed with an electron microscope. The QPQ salt bath nitriding sample and the QPQ salt bath nitriding sample were tested by scratch hardness test and wear test. The hardness and wear resistance. The results show that the sample after laser melting has a better nitriding effect. Under the same nitriding time, the nitriding layer of the sample treated by laser melting and QPQ salt bath nitriding is deeper, Scratch hardness and abrasion resistance than the sample without direct nitriding laser treatment have greatly improved, including an average scratch hardness increased by 15.6%, wear resistance increased by an average of 47.9%. The pre-laser cladding re-salt bath nitriding composite treatment process can greatly improve the wear resistance of the workpiece surface.