3Cr2W8V模具钢激光表面相变硬化层性能的研究

Study on properties of laser surface transformation hardened layer of 3Cr2W8V die steel

采用优化的工艺参数,对3Cr2W8V模具钢表面进行激光相变淬火硬化.通过对淬火层显微组织分析及X射线衍射分析发现,淬火层横截面显微组织为淬火马氏体及少量残余奥氏体,并且呈极细的针状.对淬火层进行维氏显微硬度测试,结果表明,淬硬层有均匀硬化的特征.通过激光淬火层与普通淬火层磨损失重的对比发现,激光淬火层的耐磨性较普通淬火层的耐磨性提高近一倍.

Optimized process parameters were used for the laser transformation hardening on the surface of 3Cr2WSV die steel. Through microstructure analysis and X-ray diffraction analysis of the quenched layer, it was found that the microstructure of the layer was composed of ultrafine needle-like martensite and a small amount of residual austenite. The results of Vickers microhardness tests on hardened layer showed that the layer was uniformly hardened. By comparing wear weight loss between laser hardened layer and ordinary hardened layer, it turned out that the wear resistance of laser hardened layer increased about one time than that of the ordinary quenching layer.