Surface Modification and Alloying of Metallic Materials with Low-Energy, High Current Electron Beams
The results of investigations of the surface modification and alloying of metallic materials with the low-energy (up to 40 keV), high-current (up to 40 J/cm2) electron beams (LEHCEB’s) of microsecond duration are presented. The results of simulation of non-stationary temperature fields induced in the LEHCEB’s affected zone are given. The particularities of the structure – phase transformations into the surface layers of irradiated materials are considered. It is shown that the irradiation in the surface melting and initial evaporation modes allows to decrease noticeably the surface roughness and to clean it of harmful impurities. In the near-surface layers quenched from the melt the metastable structure – phase states are formed. These states in the aggregate with the surface smoothing and cleaning provide the enhancement of some surface-sensitive properties, such as, electric strength of vacuum gaps with electrodes made of austenitic stainless steel, fatigue properties of titanium alloys, wear resistance of high-speed steel and hard metals. It is shown that pulsed melting of the film-substrate systems allows to realize the efficient surface alloying
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Issue: 6, 2006
Series of issue: Sciences
Rubric: Physics
Pages: 11 — 19
Downloads: 867