超音速微粒轰击表面纳米化及其对耐磨性的影响

采用超音速微粒轰击技术对20钢进行表面纳米化处理。研究了表面纳米化工艺对材料流失与形貌变化的影响，并采用往复磨损试验机研究了纳米化表面的磨损性能。结果表明：超音速微粒轰击在表面形成纳米层过程中使材料发生流失和表面粗糙度增大。在干摩擦和油润滑条件下，微粒轰击样品的磨损率分别是未轰击样品的2．77和1．83倍，轰击抛光样品的磨损率则比未轰击样品分别降低了26％和42％。对其影响耐磨性的原因作了初步讨论。

Surface Nanocrystallization Using Supersonic Fine Particles Bombarding and its Effect on the Wear Behaviors

Surface nanocrystallization of 1020 steel was conducted by supersonic fine particles bombarding(SFPB).The effect of surface nanocrystallization on the variation of surface was studied and the wear behaviors of nanocrystalline surface were examined by reciprocating wear tester as well,and compared with the untreated samples.Experimental results showed that SFPB treatment can prepare a nanocrystalline layer with the removal of material and increase of surface roughness.In dry and lubricated sliding conditions,the wear rate of SFPB sample was about thrice and twice as big as that of untreated one respectively,while after surface polishing the wear rate of SFPB sample was reduced by 26% and 42% in volume of untreated one.The wear mechanism was discussed preliminarily.