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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。
The effect of ion nitriding at 420 ℃ on the surface of H13 steel was investigated by scanning electron microscopy, transmission electron microscopy, optical microscopy, microhardness tester and XRD. The results show that after mechanical grinding, the surface of H13 steel forms a plastic deformation layer with a thickness of about 10μm. After 4 h plasma nitriding at 420 ℃, the total nitriding layer thickness of the polished and SMAT-treated samples were 90μm and 120μm, respectively, indicating that SMAT treatment can promote the nitriding of H13 steel to a certain degree. SMAT The hardness of the sample surface is about 1102.5 HV0.1; thermal fatigue test results show that the SMAT sample showed better thermal fatigue resistance.