Taking the alfalfa grass powder as the typical plant abrasive,the effect of laser quenching power on wear behavior of 45# steel against plant abrasive is studied systematically.The result shows that under the laboratory conditions,the maximum hardness of the material reaches 679HV,and the maximum hardness is located in 0.2-0.4mm beneath the surface of the material.Wear properties of the 45# steel after laser quenching against the plant abrasive outclass the sample of non-laser quenching.There is no consistent impact tendency of laser power between the hardness and wear resistance,and the sample which has the best wear resistance doesn't have the best hardness.Wear mechanism of 45# steel after laser quenching against plant abrasive is mainly micro-cutting.Compared with the sample of non-laser quenching,the surface plough depth of the laser quenched sample is shallower and narrower.When the laser power is decreased to 1750W,fatigue of plastic deformation and spalling of carbides of the quenched material are increased significantly.The research can provide a theoretical basis for the durability design of agricultural machinery materials.%本文以苜蓿草粉为典型植物磨料,系统研究了激光淬火功率对45 #钢抗植物磨料磨损性能的影响.试验结果表明:在实验条件下,材料表面硬度最大值可达679HV,材料硬度最大值在距表面0.2～0.4mm之间;激光淬火后的45 #钢抗植物磨料磨损性能远高于未经激光处理的试件.激光功率对材料硬度和耐磨性的影响趋势并不完全一致,耐磨性最好的试件硬度并非最高;植物磨料对激光淬火后的45#钢的磨损机理主要为显微切削,与未经激光淬火的试件相比,激光淬火后的45 #钢表面犁削深度明显浅而窄,但当激光功率降至1750W时,塑变疲劳和碳化物剥落明显增加.研究结论可为农业机械金属材料的耐磨性设计提供依据.
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