表面纳米化预处理对1Cr18Ni9Ti不锈钢渗硫层摩擦学性能的影响  

Effect of Surface Nanocrystallization Pretreatment on the Tribological Properties of Sulfide Layers of 1Cr18Ni9Ti Stainless Steel

作　　者：马国政[1] 徐滨士[1] 王海斗[1] 司洪娟[1] 

机构地区：[1]装甲兵工程学院装备再制造技术国防科技重点实验室,北京100072

出　　处：《机械工程学报》2011年第11期75-81,共7页Journal of Mechanical Engineering

基　　金：国家重点基础研究发展计划(973计划;2007CB607601);国家自然科学基金(50975285)资助项目

摘　　要：用超声速微粒轰击表面纳米化技术在1Cr18Ni9Ti不锈钢表面制备了晶粒尺寸约为30 nm的具有随机取向的等轴状纳米晶表层,后用低温离子渗硫技术在部分纳米化样品和原始样品表面分别制备了硫化物层。在УТИ-1000型球盘式摩擦磨损试验机上对比研究了干摩擦条件下纳米化处理前后的1Cr18Ni9Ti不锈钢及两种渗硫试样的摩擦学性能。结果表明,纳米化处理明显提高了1Cr18Ni9Ti钢的摩擦学性能和低温离子渗硫的效果,纳米化表面的摩擦因数由0.65降低到0.45,而纳米化预处理后渗硫层厚度由1μm增加到3.5μm。分析认为,这些性能的提升主要与纳米晶表面层具有较高的硬度、强度和化学活性有关。原始1Cr18Ni9Ti钢的主要磨损机制为磨料磨损和粘着磨损,而表面纳米化处理后转变为以疲劳磨损为主。A nanocrystalline layer is prepared on the 1Cr18Ni9Ti stainless steel by using supersonic fine particles bombarding（SFPB） surface nanocrystallization technique.And the grain size of the randomly oriented equiaxial nanograins is about 30 nm.Then,some of the original and SFPB treated（SFPBed） 1Cr18Ni9Ti samples are sulfurized by low-temperature ion sulfurization process and obtained sulfide layers,respectively.The tribological properties of the 1Cr18Ni9Ti before and after SFPB treatment and the corresponding two kinds of sulfide layers are investigated using a УТИ-1000 type ball-on-disk tribometer under dry friction.The results show that the tribological properties of 1Cr18Ni9Ti steel and the effectiveness of sulfurization are enhanced remarkably by surface nanocrystallization treatment.The friction coefficient of the SFPBed 1Cr18Ni9Ti steel with nanocrystalline surface layer descend from 0.65 to 0.45,while the thickness of the sulfide layer on the SFPB pretreated sample increased from 1 μm to 3.5 μm.These modifications can be mainly attributed to the high hardness,strength and chemistry activity of the nanocrystalline surface layer.The predominant wear mechanisms of the original 1Cr18Ni9Ti steel are abrasive wear and adhesive wear,and they transform to fatigue wear after surface nanocrystallization treatment.

关 键 词：表面纳米化 低温离子渗硫 摩擦学性能 1CR18NI9TI 钢 

分 类 号：TH117.3[机械工程—机械设计及理论]