高速钢多元共渗强化层的性能研究

Study on Performance of Multi-component Permeation Layer on High Speed Steel

对W9Mo3Cr4V钢进行多元共渗化学热处理,采用显微硬度计和光学显微镜测量强化层的硬度和厚度,采用扫描电子显微镜观察强化层的表面形貌,采用X射线衍射仪分析强化层的相结构,采用高温摩擦磨损试验仪对强化层的磨损性能进行研究。结果表明,经多元共渗处理后,W9Mo3Cr4V钢的表面强化层厚约100μm,显微硬度大于1175HV。强化层主要以氧化物、硫化物和氮化物、硼化物为主,由表面氧化疏松层、次表面致密化合物层和扩散过渡层组成。相对于原始材料,强化层硬度显著提高,从而提高了材料干摩擦条件下的耐磨性。

The gas multi-component permeation of high-speed steel （W9Wo3Cr4V） was carried out. The microhardness and thickness of the layer were measured using Vickers hardness tester and OM. The surface morphologies of hardened layer were analyzed using SEM. And the phase structure of hardened layer was determined using XRD. Then the wear behavior of hardened layer under dry sliding was investigated on a friction and wear test machine. The results show that the hardened layer, with an approximately 100μm thickness and 1175 HV maximum hardness, consists of surface loose oxidized layer, sub-surface compact compound layer and transitional diffused layer. Compared with the original material, the hardened layer possesses a better anti-wear property during dry sliding due to the increase of hardness.