Magazov Nurtoleu, Satbaeva Zarina, Rakhadilov Bauyrzhan, Amanov Auezhan
Department of Mechanical Engineering, Daulet Serikbayev East Kazakhstan Technical University, Ust-Kamenogorsk 070010, Kazakhstan.
Surface Engineering and Tribology Research Center, Sarsen Amanzholov East Kazakhstan University, Ust-Kamenogorsk 070002, Kazakhstan.
Materials (Basel). 2023 Oct 23;16(20):6824. doi: 10.3390/ma16206824.
In this study, a surface hardening of AISI 52100 bearing steel was performed by ultrasonic nanocrystal surface modification (UNSM), and electrolytic-plasma thermo-cyclic surface modification (EPSM), and their effects on the wear resistance were investigated. To evaluate the impact of these treatments on the wear resistance, the friction tests under dry conditions were conducted using a ball-on-disk tribometer in accordance with ASTM G99. The microstructure of the samples before and after treatment was characterized by scanning electron microscopy. The micro-hardness with respect to the depth from the top surface was measured using a Vickers micro-hardness tester. Microstructural observations showed that EPSM treatment led to the formation of residual austenite in the surface layer, while UNSM treatment led to the formation of a surface severe plastic deformation layer on the surface of the samples. The increase in the micro-hardness of the treated layer was confirmed after UNSM at room temperature and after EPSM at different cycles. The highest increase in wear resistance was observed for the specimen treated by UNSM treatment at 700 °C and five cycles of EPSM treatment. In addition, the wear volume, which has correlation with the friction coefficient and hardness, was determined.
在本研究中，通过超声纳米晶表面改性（UNSM）和电解等离子体热循环表面改性（EPSM）对AISI 52100轴承钢进行了表面硬化处理，并研究了它们对耐磨性的影响。为了评估这些处理对耐磨性的影响，根据ASTM G99标准，使用球盘摩擦磨损试验机在干燥条件下进行了摩擦试验。通过扫描电子显微镜对处理前后样品的微观结构进行了表征。使用维氏显微硬度计测量了相对于样品顶面深度的显微硬度。微观结构观察表明，EPSM处理导致表面层形成残余奥氏体，而UNSM处理导致样品表面形成表面严重塑性变形层。在室温下进行UNSM处理后以及在不同循环次数下进行EPSM处理后，均证实了处理层显微硬度的增加。对于在700℃下进行UNSM处理以及进行5次EPSM处理循环的试样，观察到其耐磨性提高最为显著。此外，还测定了与摩擦系数和硬度相关的磨损体积。
