氮离子注入9Cr18Mo不锈钢的表面结构与力学性能  

Surface Structures and Mechanical Properties of 9Cr18Mo Stainless Steels Implanted with Nitrogen Ions

作　　者：刘峰斌[1] 李景林[2] 金杰[3] 周刚[4] 邱维维[3] 卿涛[4] 

机构地区：[1]北方工业大学,北京100144 [2]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [3]北京机械工业自动化研究所,北京100120 [4]北京控制工程研究所,北京100080

出　　处：《稀有金属材料与工程》2013年第9期1838-1843,共6页Rare Metal Materials and Engineering

基　　金：国家自然科学基金(51075004;50975004);北京市属市管高等学校人才强教计划(PHR201107109);北京市属高等学校高层次人才引进与培养计划项目

摘　　要：针对9Cr18Mo马氏体不锈钢,检测了氮离子注入前后表面纳米硬度和摩擦磨损性能,分析了注入后9Cr18Mo钢的表面组织结构和化学组成。结果显示,氮离子注入有效提高了材料的表面硬度,降低了摩擦系数和磨损的同时,没有改变材料表面形貌和粗糙度。表面氮注入层分为两层:表面20 nm深度内除金属氮化物及氮过饱和固溶体强化相外,还富集大量碳原子,其主要存在方式为Crx Cy相;次表面层主要为金属氮化物。氮离子注入后9Cr18Mo不锈钢表面形成的新的组织结构是其具有良好力学性能的根本原因。The polished 9Crl8Mo martensitic stainless steel was implanted with nitrogen ions at a fluence of 2x1017 ion/cm2. To investigate the surface mechanical properties of the 9Crl 8Mo steel samples after nitrogen ion implantation, the surface nanohardness and tribology properties of the original and nitrogen ion implanted steel samples were investigated. At the same time, their surface morphologies were also examined. The results show that nitrogen ion implantation would improve the surface hardness and lower the friction coefficient and wear rates of 9Crl8Mo steel samples significantly, while it does not change their surface morphology and surface roughness. To elucidate the strengthening mechanism of nitrogen ion implantation, the surface structures and components were studied by X-ray diffractometer and X-ray photoelectron spectroscopy. The results indicate that nitrogen ion implantation region can be divided into two layers. One is a surface layer of around 20 nm thickness, which is composed of metal nitrides and solid solution phases besides plenty of carbon atoms and the carbon atoms accumulate at the surface in a form of CrxCy phases. The other is the subsurface layer below 20 nm depth, which is mainly composed of metal nitrides. The surface components and structures have significant contributions to the improved mechanical properties.

关 键 词：9Cr18Mo 离子注入 强化相 

分 类 号：TG142.71[一般工业技术—材料科学与工程]