Use of grazing incidence X-ray diffraction for the study of nitrogen implanted stainless steels |
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| Institution: | 1. Departamento de Física, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Av. Blanco Encalada 2008, Santiago, Chile;2. Departamento de Física, Universidad Técnica Federico Santa María, Av. España 1680, Valparaiso 2390123, Chile;1. Electronic Materials & Component Center, Korea Institute of Ceramic Engineering and Technology, Jinju 52851, South Korea;2. Department of Materials Engineering, Kyonggi University, Suwon 16227, South Korea;1. PetroChina Research Institute of Petroleum Exploration and Development, Beijing 100083, China;2. Dept. of Petroleum Engineering, Texas A&M University, College Station, TX 77843, China;3. International Exploration and Production Corporation of SINOPEC, Beijing 100029, China |
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| Abstract: | The identification of Fe, Ni and Cr nitrides formed by nitrogen-ion implantation (4×1017 N+ cm-2, 50 keV) in austenitic steels is performed by X-ray diffraction under very low glancing angles (0.00 ⩽ i ⩽ 1.5°). Spectra obtained with increasing angles i permit the investigation of layers with depths varying from 20 to more than 1000 Å. This non-destructive technique allows the surface to be controlled at each step of the treatments. Spectra were recorded on polished steel prior to and after implantation, with or without electrochemical attack. A 100 Å martensitic layer formed during the mechanical polishing is observed on the austenitic substrate. This layer is destroyed by an anodic attack before implantation of the samples. After implantation a CrN or carbonitride overlayer of a few tens of Å in thickness, may be observed. In the subjacent layers several iron and nickel nitrides are present, mainly ϵ-Fe2N-Fe3N, ς-Fe2N and Ni3N. |
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