深度拉伸塑性变形对0.7%碳钢耐磨性的影响

Effect of 0.7%C Steel Deep Drawing on Abrasive Wear Resistance

经过铅浴处理的0.7%碳钢进行冷拉变形,采用扫描电子显微镜观察分析冷拉0.7%碳钢的组织形貌,采用材料拉力试验机和显微硬度计测试0.7%碳钢丝的抗拉强度和显微硬度,采用ML-10型销-盘式磨料磨损试验机考察深度冷拉0.7%碳钢丝在不同磨料磨损工况下的磨损特性,利用扫描电子显微镜观察分析0.7%碳钢磨损表面形貌.结果表明,深度拉伸塑性变形使得0.7%碳钢的组织超细化,大幅提高0.7%碳钢的机械性能.在以氧化铝和石英为磨料工况下,随着0.7%碳钢真应变增加,耐磨性缓慢提高;在以玻璃为磨料工况下,随着0.7%碳钢真应变增加,耐磨性呈现阶段性变化,当变形达到一定程度时,0.7%碳钢的耐磨性大幅提高.在以氧化铝和石英为磨料工况下,其磨损机理以微观切削和犁沟为主;以玻璃为磨料工况下,在低应变阶段,其磨损机理以显微切削为主,在高应变阶段,磨损机理以多次塑性变形和疲劳磨损为主.

0.7% C steel was drawn on ambient temperature after processing in molten lead. Microstructure of cold drawing 0.7% C steel was examined by field emission scanning electron microscopy （FESEM）. Tensile strength and micro-hardness of cold drawing 0.7% C steel was measured. Wear properties of cold drawing 0.7% C steel was evaluated using two body abrasive wear test. The worn surface was examined by SEM. The results show that deep drawing plastic deformation refined microstructure and improved mechanical properties of 0.7% C steel. Wear resistance of 0.7% C steel was improved with increasing true strain amount when alumina and quartz particles were used as abrasives. Using glass particles as abrasives, wear resistance of the steel was greatly improved with increasing strain amount. Grooving wear was a dominant mechanism when alumina and quartz particles were used as abrasives. In case of glass particles, with increasing true strain amount, grooving morphology disappeared and wear mechanism of the steel changed.