Li Jinquan, Laptev Roman, Bordulev Iurii, Siemek Krzysztof, Horodek Pawel, Shen Haolun, Lomygin Anton, Cui Jian
School of Mechanical Engineering, Shenyang Ligong University, No.6 Nanping Center Road, Hunnan New District, Shenyang 110159, China.
Division for Experimental Physics, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia.
Materials (Basel). 2022 Jan 28;15(3):1017. doi: 10.3390/ma15031017.
During high-speed cutting, a white layer is often produced on the machined surfaces after mechanical machining, seriously affecting the mechanical properties. These properties are related to the material structure and the defects induced by cutting. However, there is a lack of research on the atomic-scale defects of the white layer. This paper studied the influence of cutting parameters, namely the feed rate, cutting speed and cutting depth, on atomic-scale defects induced by high-speed cutting in GCr15 steel. Positron annihilation studies showed typical plastically deformed or tempered carbon steel defects with additional vacancy cluster components. The quantity of these clusters changed with cutting parameters. Furthermore, significant changes were observed in the subsurface region up to 1 µm, occurring as a result of simultaneous phase transformations, deformation and thermal impacts. The predominant accumulation of only one type of atomic-scale defect was not observed.
在高速切削过程中，机械加工后加工表面常常会产生一层白层，严重影响机械性能。这些性能与材料结构以及切削引起的缺陷有关。然而，目前缺乏对白层原子尺度缺陷的研究。本文研究了切削参数，即进给速度、切削速度和切削深度，对GCr15钢高速切削引起的原子尺度缺陷的影响。正电子湮没研究表明，典型的塑性变形或回火碳钢缺陷伴有额外的空位团簇成分。这些团簇的数量随切削参数而变化。此外，在高达1 µm的亚表面区域观察到显著变化，这是同时发生的相变、变形和热冲击的结果。未观察到仅一种类型的原子尺度缺陷的主要聚集情况。
