表面具有焊层的45#钢冲击磨损的实验研究

摘要

使用杠杆原理式冲击磨损实验台及表面形貌仪等研究冲击载荷作用下表面具有不锈钢焊层的45#钢的表面损伤行为.实验工况分干接触及2种不同黏度的润滑油润滑3种接触方式,研究在不同冲击次数条件下,材料表面的损伤情况,并探讨不同黏度润滑油对冲击磨损机制的影响.结果表明:不锈钢焊层对45钢基体起到了良好的保护作用,润滑油的存在会在一定程度上抑制冲击所造成的塑性变形,使冲击凹坑呈现出与干接触时不同的表面形貌；随冲击次数的不同,材料的损伤机制主要是黏着磨损、疲劳破碎及疲劳剥落；在材料损伤的各个阶段均伴有塑性变形的出现.%Using the Lever-type impact test rig and surface morphology the damage behavior of 45 steel with stainless steel welding layer was studied, Three contact conditions were adopted , one dry contact and two lubricated with oik of different viscosity. Surface damage was studied under different impact times and the influence of oil viscosity on the impact wear mechanism was investigated. The results indicate that the stainless steel welding layer plays a good protection role. The existence of oil can restrain the plastic deformation effectively, making the pits different from the dry-contact pits. With the different impact times, the material damage mechanism is mainly adhesion wear, fatigue fracture and fatigue spalling. Plastic deformation emerges in the different stages of the material damage.