H13钢低温等离子渗氮层的热疲劳性能

采用扫描电子显微镜、透射电子显微镜、光学显微镜、显微硬度计、XRD等研究了H13钢表面经过机械研磨处理(SMAT)后420℃的离子渗氮效果。结果表明,经过机械研磨处理后,H13钢表层形成一层厚度约10μm的塑性变形层。经420℃离子渗氮4 h后,普通抛光试样和经SMAT处理后试样的渗氮层总厚度分别为90μm和120μm,表明SMAT处理对H13钢离子渗氮具有一定的促渗作用,SMAT试样表层的硬度约为1102.5 HV0.1;热疲劳试验结果表明SMAT试样表现出更好的抗热疲劳性能。

Thermal fatigue property of H13 steel after plasma nitriding at low temperature

SEM,TEM,optical micrograph,microhardness testing machine,XRD were used to study the effect of the surface mechanical attrition treated(SMAT) H13 steel after plasama nitriding at 420 ℃.The results show that after surface mechanical attrition treatment,a plastic deformation layer with a thickness about 10 μm is formed on the surface of H13 steel.After plasama nitriding at 420 ℃ for 4 h,the total nitriding depth of the polish sample and the SMAT sample is 90 μm and 120 μm,respectively.It is proved that SMAT has a certain effect to promote plasma nitriding of H13 steel.The microhardness of the surface layer on SMAT sample is about 1102.5 HV0.1 after plasama nitriding.Thermal fatigue test results show that the SMAT sample has better thermal fatigue resistance.