表面合金镀层和合金化提高铸铁机械零件接触疲劳强度研究

Research on Enhancing the Contact Fatigue Strength of Cast Iron Machine Elements with Alloy Coating and Alloying

研究了HT250铸铁材质机械零件表面涂镀N1-P与Ni-CO合金镀层和合金化后的工作性能,采用电子显微镜,光学显微镜等对复合强化后的镀层表面形貌、次表面组织、纵剖面组织,表面粗糙度,镀层及合金化后的硬度、镀层成份、镀层与基体的结合强度等进行了分析。试件的接触疲劳试验结果表明能显著提高接触疲劳寿命。

The working performance of alloy coating and after its alloying of HT250 gray cast iron machine elements surface was studied.Utilizing the electronic microscope(EM) and Optical microscope(OM) an analysis upon surface appearance,structure of sub-surface and longitudinal section,surface roughness,composition of alloy coating and micro hardness,binding strength between alloy coating and matrix metal.Etc,was carried out.Testing result of contacting fatigue shows that the coating could enhance notably the contacting fatigue life.