45钢表面增压喷丸纳米化及其耐磨性研究  

Study on Surface Nano-crystallization by Adding Pressure Shot Peening and Its Effect on Wear Resistance

作　　者：刘莉莉[1] 揭晓华[1] 于能 麦永津[1] 

机构地区：[1]广东工业大学材料与能源学院,广东广州510006 [2]广东巨轮模具股份有限公司,广东揭阳515500

出　　处：《热加工工艺》2009年第14期124-126,共3页Hot Working Technology

基　　金：广东省教育部产学研结合项目资助(2008B090500084)

摘　　要：采用增压喷丸方式对45钢进行表面处理,在材料表面制得纳米结构表层,利用SEM、TEM、XRD等方法对纳米结构表层进行了观察与分析,采用盘-销式摩擦磨损试验机研究了纳米化前后表面的磨损性能。结果表明:增压喷丸使45刚表面发生严重的塑性变形,变形厚度约30μm,表层纳米晶尺寸约65 nm,硬度比基体提高2倍;在低载油润滑条件下45钢表面纳米化后表现出优异的耐磨性能。The surface treatment of 45 steel by adding-pressure shot peening （APSP） was carried out. The nano-crystalline surface layer on 45 steel was obtained. The microstructure features of the surface layer were characterized using SEM, TEM, XRD observation. The wear behaviors of nano-crystalline surface were examined by pin-on-disc tester and compared with the untreated samples. The results show that： after APSP treatment, severe plastic deformation is observed and the thickness of deformation is about 30 μm. The size. of equiaxed nano-crystallites on the surface layer is approximately 65 nm. The surface hardness raises 2 times compared with untreated samples. Under low load and lubricated sliding conditions, 45 steel has excellent wear resistance.

关 键 词：增压喷丸 表面纳米化 45钢 耐磨性 

分 类 号：TG156.99[金属学及工艺—热处理]