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氮离子注入9Cr18Mo不锈钢的表面结构与力学性能
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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


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

    Abstract:

    The polished 9Cr18Mo martensitic stainless steel was implanted with nitrogen ions at a fluence of 2×1017 ion/cm2. To investigate the surface mechanical properties of the 9Cr18Mo 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 9Cr18Mo 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.

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刘峰斌,李景林,金 杰,周 刚,邱维维,卿 涛.氮离子注入9Cr18Mo不锈钢的表面结构与力学性能[J].稀有金属材料与工程,2013,42(9):1838~1843.[Liu Fengbin, Li Jinglin, Jin Jie, Zhou Gang, Qiu Weiwei, Qing Tao. Surface Structures and Mechanical Properties of 9Cr18Mo Stainless Steels Implanted with Nitrogen Ions[J]. Rare Metal Materials and Engineering,2013,42(9):1838~1843.]
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  • 收稿日期:2012-09-20
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