利用扫描电镜(SEM),表面粗糙度测试仪,电化学工作站等仪器,分析了机械研磨对316L不锈钢件表面及其低温渗铝层性能的影响.结果表明:机械研磨过程中,材料表面在研磨球撞击、旋压等多种作用下产生大塑性变形,形成大量组织结构缺陷并细化表层晶粒,导致试样表面粗糙度变大,硬度提高,直接影响到热处理过程及其渗层性能;机械研磨处理的316L不锈钢试样经低温渗铝后,与对比试样相比,渗铝层硬度可提高2倍以上,抗高温氧化性及耐腐蚀性能均有显著提高,同时进行了相关机理的分析探讨.
Effect of surface mechanical attrition(SMA) on properties of aluminized layer of a 316L stainless steel was analyzed by means of scanning electron microscopy (SEM),surface roughness test and corrosion resistance test on an electrochemical workstation.The results indicate that the surface roughness and hardness increase due to the SMA treating.In the SMA process,with the impacting and spinning action of the grinding balls on the material surface,severe plastic deformation,a large number of defects like dislocation,subgrain boundary and grain refining occur.After SMA and aluminizing at low temperature,the properties of the aluminized layer of the 316L stainless steel are improved:hardness of the layer is three times than that of the substrate,high temperature oxidation and corrosion resistance increase significantly.Furthermore,the influence mechanism of the SMA on the properties of the aluminized layer is also explored.
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