1. Effect of nitrogen on the plasma (ion)-carburized layer of high nitrogen austenitic stainless steel
- Author
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Ueda, Y., Kanayama, N., Ichii, K., Oishi, T., and Miyake, H.
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STAINLESS steel , *NITROGEN , *ALLOYS , *CORROSION resistant materials , *STEEL alloys - Abstract
Abstract: Austenitic stainless steel or high nitrogen austenitic steel are used extensively as structural non-magnetic materials. The former, because of their low surface hardness, have low wear resistance. Recently developed plasma (ion)-carburizing improves the surface of austenitic stainless steel by removing the oxide scale. In contrast, high nitrogen austenitic stainless steel are expected as wear-resistance material because the hardness is higher than that of conventional austenitic stainless steel. In this study, two kinds of austenitic stainless steel were plasma (ion)-carburized in an atmosphere of CH4 +H2 plasma at 1303 K for 14.4 ks. The metallurgical characteristics were then investigated using XRD (X-ray diffraction method), OM (optical microscopy), hardness testing, glow discharge optical emission spectroscopy (GDOES) and a scanning electron microscopy (SEM). The results show that the plasma (ion)-carburized low nitrogen austenitic stainless steel had the layer with structure similar to the common austenitic stainless steel. The plasma (ion)-carburized high nitrogen austenitic stainless steel had the carbide layer at the top surface, carbide dispersed layer in the matrix, and then lamellar structure of carbides toward the inner layer. [Copyright &y& Elsevier]
- Published
- 2005
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