具有纳米结构表层的纯铁和38CrMoAl钢的渗氮(英文)  

Nitriding Iron and 38CrMoAl Steel with a Nanostructured Surface Layer

作　　者：佟伟平[1,2] 陶乃垅 王镇波[1] 吕坚 卢柯[1] 

机构地区：[1]中国科学院金属研究所沈阳材料科学国家(联合)实验室 [2]东北大学材料电磁过程研究教育部重点实验室,沈阳110004 [3]法国特鲁瓦工业大学

出　　处：《中国科学院研究生院学报》2005年第2期230-238,共9页Journal of the Graduate School of the Chinese Academy of Sciences

基　　金：supportedbyNNSFofChina (5 0 0 2 110 1) ;MinistryofScienceandTechnologyofChina (G19990 64 5 0 5 )

摘　　要：通过表面机械研磨技术 (SMAT) ,在纯铁和 38CrMoAl钢样品表面产生大量的塑性应变 ,致使其表层晶粒细化至纳米量级 .随后的气体渗氮实验表明 ,纳米纯铁和 38CrMoAl钢发生渗氮反应的温度大大低于传统粗晶材料 ( >5 0 0℃ ) ,分别降至约 30 0℃和 40 0℃ .这种低温渗氮过程不仅有利于降低渗氮工件的变形和能耗 ,也为选择性渗氮技术的实现提供了新途径 .The microstructure of the surface layer on a pure iron and a 38CrMoAl steel samples was refined into the nanometer scale by means of the surface mecha nical attrition treatment (SMAT) that generates repetitive severe plastic deform ation in the surface layer. The subsequent nitriding kinetics of the SMAT sample s with a nanostructured surface layer is greatly enhanced so that the nitriding temperatures can be reduced to 300℃ for iron and about 400℃ for 38CrMoAl ste el, respectively, which are much lower than the conventional nitriding temperatu res (above 500℃). The novel nitriding process not only facilitates reduction o f torsion of the treated samples, but also provides a new approach for selective surface reactions of solids.

关 键 词：纳米材料 38CRMOAL钢 铁 渗氮 表面机械研磨 

分 类 号：TG14[一般工业技术—材料科学与工程]