In the present study, the grinding experiment of second-generation nickel-based single-crystal superalloy DD5 was carried out under different grinding parameters. The grinding force was recorded during the grinding process, and it was found that it decreased with increasing grinding speed and increased with feed speed. The microstructure evolution of ground subsurface was obtained by optical microscope (OM) and scanning electron microscope (SEM), and the elemental distribution of γ/γ' phases was investigated by energy dispersion spectrum (EDS). The results show that there are two layers different from the bulk material beneath the ground surface: (i) a white layer (WL) with no obvious structural features under limited observation scale and (ii) a severe deformed layer (SDL) with the elongated and rotated γ' phase and the narrowed γ channel. Elements segregation behavior exists in both the white layer and severe deformed layer. The grinding parameters have a great influence on the thickness of the white layer, which is due to the elemental diffusion behavior caused by intensive thermo-mechanical load. There is work hardening in the white layer, and the hardening degree aggravates with the increase in cutting speed and feed speed.

在本研究中，在不同的研磨参数下进行了第二代镍基单晶高温合金DD5的研磨实验。在磨削过程中记录了磨削力，发现它随着磨削速度的增加而减小，并随着进给速度的增加而增加。利用光学显微镜（OM）和扫描电子显微镜（SEM）获得了地下亚表面的微观结构演变，并通过能量色散谱（EDS）研究了γ/γ'相的元素分布。结果表明，在地面以下有两层与散装材料不同的层：（i）白色层（WL）在有限的观察范围内没有明显的结构特征；（ii）严重变形的层（SDL）带有细长的并旋转了γ'相和狭窄的γ通道。元素偏析行为同时存在于白色层和严重变形层中。磨削参数对白色层的厚度有很大影响，这是由于强烈的热机械负荷引起的元素扩散行为所致。在白色层中进行加工硬化，并且随着切削速度和进给速度的增加，硬化程度加剧。