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。
Influence of high current pulsed electron beam treatment （HCPEB） on surface morphology and roughness of TC4 titanium alloy was investigated. The results demonstrate that the surface roughness of the alloy after HCPEB treatment depends on the surface condition of as-received sample. When surface roughness of the original sample is greater than 0. 031 p,m, surface melting is dominant, so the surface roughness is reduced after HCPEB treatment. When surface roughness of the original sample is 0.031 ~m, crater formation is dominated, so the surface roughness increases after HCPEB treatment. In conclusion, HCPEB treatment can increase or reduce surface roughness depending on surface melting or crater formation. During the HCPEB treatment process, crack carl easily initiate in high surface roughness sample, which is due to the thermal-mechanical coupled process of HCPEB treatment.
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