In thermal spray, grit blasting is the standard method used to prepare the substrate surface before coating deposition. This study examines the effect of the grit blasting parameters on the residual stresses, roughness and hardness of three metal alloys with widely different mechanical properties: low-carbon steel, Ti-6Al-4V and Inconel 718. It also estimates the density of dislocations using the Williamson–Hall method. The dislocation structures of low-carbon steel grit blasted at different grit impingement angles were observed under a transmission electron microscope. The surface dislocation density was found to increase with the blasting time and angle of impact. Moreover, the depth profile of the dislocation density was in good agreement with that of the hardness profile of the blasted specimen. The residual stress depth profiles of each material at different blasting pressure showed an increase in the value and depth of maximum compressive residual stresses. Both surface residual stresses and roughness were found to increase with the grit blasting pressure, angle and, to some extent, with time and stand-off distance. The mechanisms of material erosion were found to be microcutting and indentation at lower and higher angles of abrasive impingement, respectively. The extent of damage of the materials was explained on the basis of the Johnson–Cook flow strength model.

中文翻译：

---

喷砂参数对不同金属合金表面和近表面性能的影响

在热喷涂中，喷砂是用于在涂层沉积前准备基材表面的标准方法。本研究检验了喷砂参数对具有广泛不同机械性能的三种金属合金的残余应力、粗糙度和硬度的影响：低碳钢、Ti-6Al-4V 和 Inconel 718。它还使用以下方法估计位错密度威廉姆森-霍尔方法。在透射电子显微镜下观察了不同喷砂冲击角度的低碳钢喷砂的位错结构。发现表面位错密度随着爆破时间和冲击角度而增加。此外，位错密度的深度分布与喷砂试样的硬度分布非常吻合。每种材料在不同爆破压力下的残余应力深度分布都显示出最大压缩残余应力的值和深度增加。发现表面残余应力和粗糙度都随着喷砂压力、角度以及在一定程度上随着时间和间隔距离而增加。发现材料侵蚀的机制分别是在较低和较高磨料冲击角度下的微切削和压痕。材料的损坏程度是在 Johnson-Cook 流动强度模型的基础上解释的。随着时间和距离。发现材料侵蚀的机制分别是在较低和较高磨料冲击角度下的微切削和压痕。材料的损坏程度是在 Johnson-Cook 流动强度模型的基础上解释的。随着时间和距离。发现材料侵蚀的机制分别是在较低和较高磨料冲击角度下的微切削和压痕。材料的损坏程度是在 Johnson-Cook 流动强度模型的基础上解释的。