摘要
采用表面机械研磨技术在低碳钢上制备出纳米结构表层，利用Ｘ射线衍射和电子显微分析研究表层的结构特征，并对硬度沿厚度方向的变化进行分析． 结果表明：经过表面机械研磨处理后，样品表层的晶粒可细化至纳米量级． 表面纳米晶层的厚度约为 ４０ μｍ，平均晶粒尺寸由 １０ ｎｍ逐渐增加到 １００ ｎｍ；在距表面约 ４０—８０ μｍ的深度为亚微晶层，平均晶粒尺寸进一步增至 １０００ ｎｍ．与样品的心部相比，表层的硬度显著提高。
A nanostructured surface layer was fabricated on a low carbon steel plate by using a surface mechanical attrition (SMA) treatment. The refined microstructure in the surface layer was characterized by means of X-ray diffraction and electron microscopy, and the hardness variation along the depth of the treated sample was examined. Experimental evidences show that after the SMA treatment the microstructure of the surface layer may be refined into the nanoscale. The thickness of the nanocrystalline layer is approximately 40 μm and the average grain size increases from 10 nm in the top surface layer gradually to 100 nm at a depth of 40 μm. In the region of 40-80 μm deep from the top surface, there exists a ultrafine grained layer, in which the average grain size Increases from 100 nm to about 1000 nm. The hardness of nanostructured surface layer is enhanced significantly after the SMA treatment compared with that of the original sample.
出处
《金属学报》
SCIE
EI
CAS
CSCD
北大核心
2002年第2期157-160,共4页
Acta Metallurgica Sinica
基金
中国科学院知识创新基金
国家自然科学基金50071061
Conseil Regional de Champagne Arde
关键词
低碳钢
表面机械研磨
表面纳米化
微观结构
力学性能
low carbon steel, surface mechanical attrition, surface nanocrystallization, mi-crostructure, mechanical property
