T10钢的脉冲爆炸-等离子体表面改性

为了提高T10钢的耐磨性和表面硬度,通过脉冲爆炸-等离子体(PDP)对T10钢进行表面改性,使用光学显微镜(OM)、扫描电镜(SEM)分析PDP处理前后T10钢的组织形貌,使用X射线衍射仪分析PDP处理后的试样的结构变化,使用显微维氏硬度计检测试样PDP处理前后的显微硬度,使用磨损试验机检测PDP处理前后的耐磨性能,使用电化学工作站检测试样PDP处理前后的耐腐蚀性能。结果表明:PDP处理T10钢后,在材料表层形成了外层为柱状区、内层为组织细化区双层结构的改性层,厚度约为70.71μm,显微硬度约为PDP处理前的2倍,磨损质量损失较基体减少,磨痕宽度明显减小; PDP处理前后T10钢自腐蚀电位无明显变化; PDP处理过程中试样快速加热、快速冷却且空气中N₂参与,使改性层有残余奥氏体出现,并生成新相Fe₃N,从而提高了T10钢的硬度和耐磨性; PDP前后试样耐蚀性变化不大。

Surface Modification of T10 Steel by Pulse Detonation-Plasma Technology

In order to improve the hardness and wear resistance,T10 steel was surface modified by pulse detonation-plasma( PDP). The morphology and structure of T10 steel before and after treatment were analyzed by optical microscope( OM) and scanning electron microscope( SEM),and the phase transformation of sample after PDP treatment was studied by X-ray diffraction( XRD). In addition,the microhardness,wear resistance and corrosion resistance before and after treatment were investigated by microhardness tester,wear tester and electrochemical workstation,respectively. Results showed that after the pulse detonation-plasma treatment,a modified layer was formed on the surface of the specimen,which had a double layer structure of an outer layer as a columnar region and an inner layer as a microstructure refinement region,and the thickness was about 70.71 μm. Moreover,compared with the matrix,the microhardness was about 2 times,and the wear quality loss and the wear scar width were also significantly reduced. There was no significant change in the self-corrosion potential of the samples before and after PDP treatment. In the PDP process,the sample was rapidly heated and rapidly cooled,and N2 existed in the air,so that the retained layer had residual austenite and generated new phase Fe3N,thereby improving the hardness and wear resistance of the T10 steel. Furthermore,the corrosion resistance after treatment was basically unchanged.