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| Surface Carbon Chemical States of Ion Implanted AISI 440C Martensitic Stainless Steel |
| Jie JIN1,2,Feng-bin LIU3,Yun-bo CHEN2,Ke-wei GAO1 |
1. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083,China
2. China Academy of Machinery Science and Technology, Beijing 100120, China
3. College of Mechanical and Electric Engineering, North China University of Technology, Beijing 100144, China |
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Abstract Carbon atoms segregate in the surface region for polished AISI 440C stainless steel. After ion implantation, the surface carbon atoms exist in different forms. To elucidate their existence, surface structures and carbon chemical states of unimplanted, N+ implanted, Ti+ implanted and N+/Ti+ co-implanted samples were analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM) and X-ray photoelectron spectroscopy (XPS). The results indicated that various phases form in the surface or subsurface region after ion implantation, while the surface topography of the samples remains intact. For polished unimplanted sample, besides some Fe3C phase and C-C phase, CrxCy phase dominates its surface region. Little change of carbon chemical states occurs after N+ ion implantation. For Ti+ implanted sample, besides some metal oxycarbide phases, most carbon amorphous phases form in surface region. Concerning N+/Ti+ co-implantation, CrxCy compound as well as Fe3C phase dominates the surface region while no C-C phase is found. In addition, compared with single-ion implantation, N+/Ti+ co-implantation would increase the ion implantation depth significantly. The formed phases of the carbon atoms play an important role in affecting the surface properties of AISI 440C stainless steel.
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Received: 12 February 2014
Published: 05 June 2015
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| Fund:National Nature Science Foundation of China;Funding Project for Academic Human Resources Development in Institutions of Higher Learning under the Jurisdiction of Beijing Municipality;The Importation and Development of High-Caliber Talents Project of Beijing Municipal Institutions |
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2015, Vol. 22 
