Mironov Sergey, Ozerov Maxim, Kalinenko Alexander, Zuiko Ivan, Stepanov Nikita, Plekhov Oleg, Salishchev Gennady, Semiatin Lee, Zherebtsov Sergey
Institute of Materials Science and Innovative Technologies, Belgorod National Research University, 308015 Belgorod, Russia.
World-Class Research Center "Advanced Digital Technologies", State Marine Technical University, 198095 Saint Petersburg, Russia.
Materials (Basel). 2023 Jul 30;16(15):5365. doi: 10.3390/ma16155365.
Laser shock peening (LSP) is an innovative technique that is used to enhance the fatigue strength of structural materials via the generation of significant residual stress. The present work was undertaken to evaluate the degree of plastic strain introduced during LSP and thus improve the fundamental understanding of the LSP process. To this end, electron backscatter diffraction (EBSD) and nano-hardness measurements were performed to examine the microstructural response of laser-shock-peened Ti-6Al-4V alloy. Only minor changes in both the shape of α grains/particles and hardness were found. Accordingly, it was concluded that the laser-shock-peened material only experienced a small plastic strain. This surprising result was attributed to a relatively high rate of strain hardening of Ti-6Al-4V during LSP.
激光冲击强化（LSP）是一种创新技术，通过产生显著的残余应力来提高结构材料的疲劳强度。目前的工作旨在评估激光冲击强化过程中引入的塑性应变程度，从而增进对激光冲击强化过程的基本理解。为此，进行了电子背散射衍射（EBSD）和纳米硬度测量，以研究激光冲击强化后的Ti-6Al-4V合金的微观结构响应。结果发现，α晶粒/颗粒的形状和硬度仅有微小变化。因此，得出的结论是，激光冲击强化后的材料仅经历了较小的塑性应变。这一令人惊讶的结果归因于Ti-6Al-4V在激光冲击强化过程中相对较高的应变硬化速率。
