快速多重旋转碾压方法在45钢表面制备纳米结构  

Surface nanocrystallization of steel 45 induced by fast multiple rotation rolling

作　　者：袁兴栋[1] 许斌[1] 杨晓洁 

机构地区：[1]山东建筑大学材料科学与工程学院,山东济南250101 [2]山东省产品质量检验研究院,山东济南250100

出　　处：《材料热处理学报》2016年第2期204-207,共4页Transactions of Materials and Heat Treatment

基　　金：山东省高等学校科技计划项目(J12LA11)

摘　　要：采用快速多重旋转碾压(FMRR)的方法对45钢表面进行纳米化处理,同时利用扫描电子显微镜(SEM)、透射电子显微镜(TEM)、X射线衍射仪(XRD)以及电子显微硬度计对试样表层的塑性变形和纳米结构进行表征。试验结果表明:FMRR处理后45钢表层发生严重的塑性变形,变形层约为20μm,变形具有方向性;晶粒变得细小,达到纳米量级,呈随机分布,晶粒尺寸约为100 nm,部分晶粒被拉长成条状;没有新相的产生,晶粒的细化致使衍射峰明显宽化;明显提高了材料的表面显微硬度;这种方法为金属材料表面强化提供科学的途径。A nanostructured layer was fabricated by using fast multiple rotation rolling （FMRR） on the surface uf steel 45 sample. The deformation layer and the microstructure of the top surface layer of the sample were characterized by transmission electron microscopy （TEM）, scanning electron mieroscopy（SEM） , X ray diffraction and miero hardness test. Experimental results show that severe plastic deformation is observed in the surface layer with thickness about 20μm. FMRR can cause surface nanocrystallization with grain size of 100 nm in the top surface layer of the sample. The nano-grains are random in crystallographic orientations. No new phase is found in the top surface layer of the sample by FMRR treatment. However, it can be distinctly observed that the diffraction peaks for the FMRR sample is mueh broader than those of the as-received sample. Surface microhardness uf the FMRR sample is enhanced.

关 键 词：45钢 纳米结构 快速多重旋转碾压方法 位错 

分 类 号：TG111.2[金属学及工艺—物理冶金]