【摘要】 采用正交试验法在磨料磨损试验机上考察了不同粒度苜蓿草粉对45#钢和HT200灰铸铁磨损性能的影响,研究了不同载荷和转速等条件下的磨料磨损行为,采用扫描电子显微镜对其磨损表面形貌进行观察.结果表明:影响材料磨损性能的因素由大到小依次为转速、磨粒粒度和载荷;苜蓿草粉磨粒对金属材料表面的磨损为硬、软磨粒共同作用的结果;45#钢在硬磨料磨损条件下以显微切削为主要磨损机制,在软磨粒磨损条件下以多次塑性变形和低周期疲劳为主要磨损机制;HT200灰铸铁以塑性变形而产生的脆化剥落为主要磨损机制.更多还原

【Abstract】 Abrasive wear caused by the alfalfa powder is the main reason for the failing of the key parts of the feed circular mould pellet machine.The influence of the load,rotation speed and granularity on the tribological properties of 45~# steel and HT200 gray cast iron sliding against alfalfa powder were investigated on an ML-100 test rig by using orthogonal design. The worn surface morphology of the metals was observed on a scanning electron microscope(SEM).The results showed that the influence factors of the wear properties are rotation speed,granularity and load in the order of importance,and the wear of the metals was caused by the hard and soft abrasive formed by alfalfa powder.When running against hard abrasive,the worn surface of the 45~# steel was characterized by the micro-cutting wear,while it was dominated by plastic deformation and fatigue wear in the case of soft abrasive.For the HT200 gray cast iron,the wear was caused mainly by the brittle flake.更多还原