Moneta Marcin, Stodolny Jerzy, Michalkiewicz Beata, Wróbel Rafał Jan
Department of Chemical Technology and Engineering, West Pomeranian University of Technology, Szczecin, ul. Pułaskiego 10, 70-322 Szczecin, Poland.
Elterma S.A. S.K.A., ul. Poznańska 58, 66-200 Świebodzin, Poland.
Materials (Basel). 2023 Jun 21;16(13):4496. doi: 10.3390/ma16134496.
A crucial factor of a nitriding process of treated parts is surface roughness. Eight samples of 42CrMo4 steel were used to investigate the parameter represented by Ra. In the study, the innovative combined microhardness profiles were used to present results within the compound zone and diffusion layer. Therefore, two loads were applied in the compound zone, 5 gf, and diffusion layer, 500 gf. Observation with SEM and chemical analysis of the investigated samples showed a correlation between microstructure, nitrogen concentration and microhardness of the compound zone. XRD diffraction was used to identify the phase composition. Moreover, the X-ray photoelectron spectroscopy technique was also applied in the study. No distinct correlations between compound zone morphology and the Ra parameter were observed. The thickness value of the structure was constant and fluctuated around 20 µm in the vast majority of the examined cases. However, analysis of the results revealed a dependence between the Ra parameter and diffusion layer thickness. The values of this parameter varied in the range of 356-394 µm depending on the Ra parameter. A distinct nitrided layer was observed on the polished sample.
处理零件氮化过程的一个关键因素是表面粗糙度。使用8个42CrMo4钢样本研究以Ra表示的参数。在该研究中，采用创新的组合显微硬度剖面图来呈现化合物层和扩散层内的结果。因此，在化合物层施加5 gf的载荷，在扩散层施加500 gf的载荷。对研究样本进行扫描电子显微镜观察和化学分析，结果表明化合物层的微观结构、氮浓度和显微硬度之间存在相关性。利用X射线衍射确定相组成。此外，该研究还应用了X射线光电子能谱技术。未观察到化合物层形态与Ra参数之间存在明显相关性。在绝大多数检测案例中，结构的厚度值恒定，在20 µm左右波动。然而，结果分析表明Ra参数与扩散层厚度之间存在相关性。该参数的值根据Ra参数在356 - 394 µm范围内变化。在抛光样本上观察到明显的氮化层。
