电子束多道扫描对45钢表面熔凝处理后的影响

The impact of multi-channel Scanning Electron Beam of 45 Steel Surface Melting

对45钢表面采用多道搭接的方法进行电子束表面熔凝处理。利用光学显微镜、扫描电子显微镜、能谱仪分析和研究了电子束表面改性层的显微组织结构、晶粒生长方向和裂纹开裂情况。实验结果表明,经电子束扫描过的表面完全熔凝形成强化层,强化层组织主要为枝晶和柱状晶,且晶粒得到细化,在扫描区产生了微观的和宏观裂纹。

45 steel surface using the method of multi-channel overlapping electron beam surface melting treatment. Us- ing optical microscopy, scanning electron microscopy, energy dispersive spectroscopy analysis and study of the microstructure of electron beam surface modification layer, the grain growth direction and eraek crack the case. The experimental results showed that the electron beam is scanned over the surface of the reinforcing layer is formed completely fused, the reinforcing layer is mainly organized columnar dendrite crystals, and grain refinement in the scanning area to produce micro-and macro-cracks.