HIGH-CURRENT PULSED ELECTRON BEAM: RAPID SURFACE ALLOYING AND WEAR RESISTANCE IMPROVEMENT
来源期刊：Acta Metallurgica Sinica2003年第4期
论文作者：C.Dong A.M.Zhang S.Z.Hao A.M.Wu T.Xu Z.R.Zhou H.W.Liu J.Xu
Key words：high-current pulsed electron beam; surface alloying; tribology; fretting wear;
Abstract: The present paper reports the rapid surface alloying induced by the bombardment of high-current pulsed electron beam. Two kinds of substrate materials were examined to show this effect. The first sample was a pure Al metal pre-coated with fine carbon powders prior to the bombardment, and the second alloy is the D2-Cr12Mo1 V1 mould steel pre-coated with Cr, Ti, and TiN powders. The surface elements diffuse about several micrometers into the substrate materials only after several bombardments.Tribological behaviors of these samples were characterized and significant improvement in wear resistance was found. Finally, a TEM analysis reveals the presence of stress waves generated by coupled thermal and stress fields, which was considered as the main cause of the enhanced properties.
C.Dong1，A.M.Zhang2，S.Z.Hao1，A.M.Wu1，T.Xu2，Z.R.Zhou3，H.W.Liu3，J.Xu3
(1.State Key Lab. for Materials Modification by Laser, Ion and Electron Beams, Dalian University of Technology, Dalian 116024, China;
2.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, The Chinese Academy of Sciences, Lanzhou 730000, China;
3.Tribology Research Institute, Southwest Jiaotong University, Chengdu 610031, China)
Abstract:The present paper reports the rapid surface alloying induced by the bombardment of high-current pulsed electron beam. Two kinds of substrate materials were examined to show this effect. The first sample was a pure Al metal pre-coated with fine carbon powders prior to the bombardment, and the second alloy is the D2-Cr12Mo1 V1 mould steel pre-coated with Cr, Ti, and TiN powders. The surface elements diffuse about several micrometers into the substrate materials only after several bombardments.Tribological behaviors of these samples were characterized and significant improvement in wear resistance was found. Finally, a TEM analysis reveals the presence of stress waves generated by coupled thermal and stress fields, which was considered as the main cause of the enhanced properties.
Key words:high-current pulsed electron beam; surface alloying; tribology; fretting wear;
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