Ti–6Al–4V components fabricated by laser powder bed fusion (LPBF) suffer from high brittleness and poor toughness issues, which are largely attributed to the \({\alpha }^{^{\prime}}\)-martensite phase of LPBF products. Post-heat treatment is often carried out to improve the toughness of LPBF products, which, however, has been reported to result in a decrease in strength, abrasion resistance, and corrosion resistance. In this study, laser shock peening (LSP) is applied to post-heat-treated Ti–6Al–4V LPBF products as a solution to achieve enhanced surface properties as well as improved toughness. By post-heat treatment only the impact toughness of the LPBF-fabricated Ti–6Al–4V could be increased by 150%, that too at a significant degradation of surface hardness, wear, and corrosion resistance. When LSP is applied to the post-heat-treated Ti–6Al–4V, impact toughness remains nearly the same, whereas surface hardness and wear resistance are recovered to approximately 92% and almost full values prior to heat treatment, respectively. LSP also decreased the corrosion rate by 64% from that of the heat-treated sample. The results showed that LSP combined with post-heat treatment is a plausible approach to achieve both high impact toughness and enhanced surface properties in LPBF-fabricated Ti–6Al–4V products.

通过激光粉末床熔合（LPBF）制备的Ti-6Al-4V组件存在高脆性和韧性差的问题，这在很大程度上归因于\（{\ alpha} ^ {^ {\ prime}} \）-LPBF产品的马氏体相。通常进行后热处理以提高LPBF产品的韧性，但是据报道，这会导致强度，耐磨性和耐腐蚀性下降。在本研究中，将激光冲击喷丸（LSP）应用于经过后处理的Ti-6Al-4V LPBF产品，以实现增强的表面性能和韧性的解决方案。通过后热处理，只能将LPBF制造的Ti-6Al-4V的冲击韧性提高150％，在表面硬度，耐磨性和耐蚀性显着降低的情况下也可以提高。当将LSP应用于热处理后的Ti-6Al-4V时，冲击韧性几乎保持不变，而在热处理之前，表面硬度和耐磨性分别恢复到大约92％和几乎全值。LSP还使热处理后的样品的腐蚀速率降低了64％。结果表明，在LPBF加工的Ti-6Al-4V产品中，LSP与后热处理相结合是实现高冲击韧性和增强表面性能的可行方法。