Warm laser shock peening (WLSP) is a novel surface modification technology involving a combination of laser shock peening (LSP) and dynamic strain aging (DSA) technologies. Nickel-based single-crystal superalloy is one of the leading materials for aeroengine turbine blades. Hence, studying the surface modification effect of WLSP on [001]-oriented DD6 nickel-based single-crystal superalloy has a real significance in the aerospace field. Three experimental heating temperatures, 260 °C, 280 °C, and 300 °C, were selected in the vicinity of DD6 DSA temperature, and WLSP treatment was carried out on [001]-oriented DD6 specimens. Microstructure, FEM simulation of laser-induced compressive residual stress field, microhardness, and microstructural changes after the heat treatment of specimens were studied. The test results show that WLSP could generate plenty of stable dislocation structures in the impacted regions, and the effect of WLSP is positively correlated with the experimental temperature. Besides, both the WLSP-induced compressive residual stress and the microhardness in the impacted region tend to increase with the increase in WLSP temperature. The microstructure of a WLSP specimen varies at different annealing temperatures.

暖激光冲击喷丸（WLSP）是一种新颖的表面改性技术，涉及激光冲击喷丸（LSP）和动态应变时效（DSA）技术的结合。镍基单晶高温合金是航空发动机涡轮叶片的主要材料之一。因此，研究WLSP对[001]取向的DD6镍基单晶高温合金的表面改性作用在航空航天领域具有现实意义。在DD6 DSA温度附近选择了三个实验加热温度260°C，280°C和300°C，并对[001]取向DD6样品进行了WLSP处理。研究了试样热处理后的激光显微组织，激光压缩残余应力场的有限元模拟，显微硬度和显微组织的变化。试验结果表明，WLSP可以在受冲击区域产生大量稳定的位错结构，且WLSP的作用与实验温度呈正相关。此外，随着WLSP温度的升高，WLSP引起的压缩残余应力和受冲击区域的显微硬度均趋于增加。WLSP试样的微观结构在不同的退火温度下会发生变化。