40Cr钢表面纳米化的研究  

Research on Surface Nanocrystallization of 40Cr Steel

作　　者：路彩虹[1,2] 井晓天[1] 葛利玲[1] 卢正欣[1] 刘忠良[1] 

机构地区：[1]西安理工大学材料科学与工程学院,陕西西安710048 [2]中国石油天然气集团公司管材研究所,陕西西安710065

出　　处：《西安理工大学学报》2008年第4期480-483,共4页Journal of Xi'an University of Technology

基　　金：陕西省自然科学基金资助项目(2005E101)

摘　　要：采用超音速微粒轰击技术(SFPB)对40Cr调质钢进行表面纳米晶结构制备,并利用TEM、XRD、GX-71型金相显微镜和TUKON2100显微/维氏硬度计等对表面纳米层的组织结构和显微硬度进行了分析研究。结果表明,经过SFPB表面处理后,在40Cr调质钢表面晶粒细化,形成了随机取向的铁素体和渗碳体纳米晶粒,晶粒尺寸达到10 nm,纳米层厚度为40μm;纳米晶粒尺寸随着距表面距离增加而增大,纳米化主要是位错运动的结果;经SFPB处理后表层的显微硬度提高到526HV,且随着深度的增加硬度迅速降低。By means of Supersonic Fine Particles Bombarding （ SFPB）, nanostructured surface layer was fabricated on 40Cr steel plate. The organic structure and micro-hardness of the nanostructured surface layer are studied and analyzed by means of TEM, XRD, GX-71 type of metal-phase microscope and TUKON2100 microscope/vicker＇ s hardometer. The results indicate that after SFPB surface treatment, the nanocrystal grains of ferrite and cementite phases with random direction are formed on 40Cr steel surface crystal grain fineness with the size of crystal grain reaching 10 nm, and the thickness of nanolayer being 40 μm. The nanograin size increases with an increase in surfaee distance, and the grain refinement is mainly due to the dislocation movement. After the SFPB treatment, the surface mierohardness can increase to 526HV, but hardness is fast reduced with an increase in the depth.

关 键 词：超音速微粒轰击技术 40CR钢 纳米结构表面层 显微硬度 

分 类 号：TG178[金属学及工艺—金属表面处理]