30CrMnSiNi2A钢干滑动摩擦磨损特性研究

利用销盘高速干滑动摩擦磨损试验机,对30Cr Mn Si Ni2A低合金超高强度钢的摩擦磨损性能进行了研究,应用JSM-6390A型扫描电子显微镜和X-衍射方法对摩擦磨损表面进行观察,表征其摩擦表面的微观形貌、摩擦磨损产生的磨屑以及由于摩擦产热而引起的氧化物,进而推断出磨损机制.结果表明:摩擦系数随速度和载荷的增大而减少,其速度是影响摩擦系数的主要因素;在摩擦初期当摩擦系数快速下降时,摩擦表面温度急剧增加,当达到一定数值后二者都形成一个动态的平衡;随着速度和载荷增大,磨损机理主要由氧化磨损转变为剥落、塑性变形、犁沟以及黏着磨损,且磨损表层的氧化物由Fe O转变为Fe_3O_4和Fe_2O_3,当出现Fe_2O_3氧化物时,磨损率急剧升高.

Friction and Wear Characteristics of 30CrMnSiNi2A Steel at Dry Sliding Condition

By using a high speed tribo-tester, tribological behaviors of 30CrMnSiNi2A steel were investigated under high speed dry sliding conditions. Morphology of the worn surfaces and the debris were analyzed by scanning electron microscope and the oxides of worn surfaces by friction heat were detected by X-ray diffraction. The results show that friction coefficient declined with increasing load and sliding speed. The sliding speed was the main factor affecting the friction coefficient. At the beginning of friction, the friction coefficient decreased rapidly while the surface temperature of pin dramatically increased. After that, friction coefficient and surface temperature reached a steady value. As the sliding speed and load increased, the wear mechanism tranformed from oxidation wear to delamination, plastic deformation, groove and adhesive wear, and oxides on worn pin surface were FeO at lower slidinng speed and load and Fe₃O₄ and Fe₂O₃ at higher sliding speed and load.