SURFACE MODIFICATION OF 316L STAINLESS STEEL BY HIGH CURRENT PULSED ELECTRON BEAM Part I Selective surface purification and its mechanism
316L不锈钢强流脉冲电子束表面改性研究Ⅰ.表面选择净化及机理

In this paper, the processing and corresponding mechanisms of the surface modification of 316L stainless steel by high current pulsed electron beam were studied in detail. The results showed that MnS inclusions in the 316LSS served as the nucleation sites for craters formed during the bombardment. The overheating of these inclusions or their interfaces and following eruptions are believed to be the reason for the crater formations. As a result, MnS inclusions in the surface layer decreased with the increasing number of pulses, leading to a selective surface purification of the material. On the other hand, the physical damages induced by the electron beam bombardment are repaired after repeated pulses, that is, the crater density decreases with the increasing number of bombardments, meanwhile the holes in the crater centers are removed gradually.