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采用强流脉冲电子束对TC4钛合金表面进行处理,研究了电子束处理后TC4钛合金的表面形貌、表面粗糙度变化。结果表明,电子束处理对表面粗糙度的影响与预处理试样表面状态有关:当预处理试样表面粗糙度大于0.031μm时,电子束处理后其粗糙度降低,在该条件下表面层的缺陷较多,表面熔化占主导作用;当预处理试样表面粗糙度为0.031μm时,电子束处理后粗糙度增大,此时表面熔坑形成占主导作用。因此电子束处理有增加或减小粗糙度的双重特性,这取决于表面熔化和熔坑形成两种机制的强弱状态。当预处理试样的粗糙度大于0.468μm时,由于电子束处理过程中的热力耦合过程,处理后表层极易形成裂纹。
The surface of TC4 titanium alloy was treated by pulsed electron beam. The surface morphology and surface roughness of TC4 titanium alloy after electron beam treatment were studied. The results show that the influence of electron beam treatment on the surface roughness is related to the surface state of the pretreatment sample: when the surface roughness of the pretreatment sample is more than 0.031μm, the roughness of the surface layer after e-beam treatment decreases. Under the conditions, When the surface roughness of pretreatment sample is 0.031μm, the roughness increases after electron beam treatment, and the formation of surface crater dominates. Therefore, electron beam processing has the dual characteristics of increasing or decreasing roughness, depending on the strength of the two mechanisms of surface melting and crater formation. When the pretreatment sample roughness greater than 0.468μm, due to the electron beam treatment process of thermal coupling process, the surface layer is extremely vulnerable to crack formation.