渗碳辅助磨削强化表面创成机制研究

目的 探究渗碳辅助磨削表面材料动态强化去除机制。方法 以20CrMnTi为研究对象，首先进行渗碳辅助磨削的探索性试验，分析磨削微渗碳的可行性。其次，基于磨粒与工件材料间的相互作用，提出一种动态表面创成模型，分析增碳表面的渗碳效果。最后，结合磨削渗碳强化试验验证增碳表面性形协同提升效果。结果 磨削接触区的微渗碳效应增大了表面的碳含量，使得表面在冷却阶段更易析出强化相。该方法可有效提高加工表面的硬度（最大提升了60%）。微渗碳效应使得表面材料硬化，同时抑制了脊状突起的形成，使切屑更易形成，从而提高表面精度（粗糙度Ra降低了0.3μm）。结论 针对低碳钢表面的高性能制备，提出了一种新的渗碳辅助磨削强化方法，该方法可实现表面材料的微渗碳。在强参数磨削热作用下表面材料会发生奥氏体–马氏体转变，显著提高了硬度。同时，微渗碳作用可削弱表面材料的塑性及犁削作用，提高表面加工质量。

Strengthening Surface Generation Mechanism of Carburization-assisted Grinding

The grinding surface with high machining quality and superior physical properties is in urgent demand, but most existing manufacturing methods have limitations in manufacturing cost and efficiency. Therefore, a carburization-assisted grinding method is proposed. It is an advanced surface modification technology, which can significantly improve surface properties, such as wear resistance, hardness, and roughness. Based on experiment and theoretical analysis, the dynamic strengthening and removal mechanism of surface materials in carburization-assisted grinding were explored.