Examination on surface films of plasma nitrided and post-stream oxidised H13 steel Online publication date: Mon, 16-Jun-2008
by Yongan Min, Xiaochun Wu, Luoping Xu
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 3, No. 2/3, 2008
Abstract: Different surface structures have been obtained on H13 steel by plasma nitriding under a mix current of ammonia and argon at 520°C, and a simple current of ammonia at 550°C. Post-stream oxidation gives the H13 samples a compact oxide film. The surface films and structures of these samples have been investigated with optical microscopy, X-ray diffraction, scanning electron microscopy and high distinguishability energy diffraction spectrometry. Only a single nitrogen diffusion layer is obtained on the 520°C-nitrided H13 samples, while a white Fe2-3N nitride film and a deeper diffusion layer with needle-like nitride is obtained on the 550°C-nitrided samples. These two type samples are covered by the films of Me3O4 mainly as well as Fe2O3 after post-oxidation. It is also discussed on the application chances of the duplex treatment, which is cleaner and more environment friendly than conventional salt bath or gaseous techniques.
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