Guo Yu, Liu Minghe, Zhang Yiming
School of Mechanical Engineering and Automation, Northeastern University, Shenyang 110819, China.
School of Mechanical Engineering, Shenyang Jianzhu University, Shenyang 110168, China.
Materials (Basel). 2025 Feb 21;18(5):975. doi: 10.3390/ma18050975.
The grind-hardening process is capable of generating a martensitic-based hardened layer on the workpiece surface. The production of a hardened layer can significantly improve the application properties of the workpiece. In fact, theoretical research on the wear process of hardened layers is a powerful key to promoting the grind-hardening process, which is the main focus of the current experimental study. For this purpose, the paper carries out the grind-hardening experiment on AISI 1045 steel first by discovering the formation mechanism of the hardened layer. Then, friction and wear experiments are conducted on hardened workpieces to analyze the influence laws of different conditions on the friction coefficient and wear morphology, as well as its profile. On this basis, combined with the Archard wear model, finite element simulations are carried out on the wear process with different friction conditions. The wear depth is effectively predicted. The results show that the wear depth gradually rises with the increase in friction load and frequency. Additionally, considering different friction conditions, the errors between the predictive and experimental values of the wear depth with both average friction coefficient and variable friction coefficient are 4.36-15.22% and 1.57-10.4%, respectively, which validates theoretical research on the wear resistance of the hardened workpiece.
磨削硬化工艺能够在工件表面生成基于马氏体的硬化层。硬化层的产生可显著改善工件的使用性能。事实上，对硬化层磨损过程的理论研究是推动磨削硬化工艺的有力关键，这也是当前实验研究的主要重点。为此，本文首先通过探究硬化层的形成机理，对AISI 1045钢进行磨削硬化实验。然后，对硬化后的工件进行摩擦磨损实验，以分析不同条件对摩擦系数、磨损形貌及其轮廓的影响规律。在此基础上，结合阿查德磨损模型，对不同摩擦条件下的磨损过程进行有限元模拟。有效预测了磨损深度。结果表明，磨损深度随摩擦载荷和频率的增加而逐渐增大。此外，考虑不同摩擦条件时，平均摩擦系数和变摩擦系数下磨损深度预测值与实验值之间的误差分别为4.36 - 15.22%和1.57 - 10.4%，这验证了对硬化工件耐磨性的理论研究。
