纳米化处理超声金属表面  

Metal Surface Nanocrystallization by Ultrasonic Processing

作　　者：王东坡[1] 宋宁霞[1] 王婷[1] 霍立兴[1] 

机构地区：[1]天津大学材料科学与工程学院,天津300072

出　　处：《天津大学学报》2007年第2期228-233,共6页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(50405019)

摘　　要：采用超声表面加工处理方法在45钢上制备出纳米结构表层.TEM(透射电子显微镜)、XRD(X射线衍射)、粗糙度和显微硬度试验结果表明:经超声处理后,样品表层的晶粒可细化至纳米量级,平均晶粒尺寸为50 nm,且在某些区域出现纳米晶与非晶嵌套结构,表面形成残余压应力,表面粗糙度值降为原始样品的1/100,与样品心部相比,表层硬度显著提高.A nanostructured surface layer was fabricated on 45 steel by using ultrasonic surface processing. Resuits of TEM（ transmission electron microscope）, XRD（ X-ray diffractometer）, surface roughness and microhardness tests indicated that the process induced nanocrystallization and partial amorphization, the average grain size is 50 nm, residual compression stress forms on the surface, the roughness of the processed specimen is highly decreased and the hardness is improved compared with the center of the specimen.

关 键 词：45钢 微观结构 超声处理 表面纳米化 

分 类 号：TG132.2[一般工业技术—材料科学与工程] TG113.22[金属学及工艺—合金]