Effect of plasma nitriding on the microstructure, hardness and tensile properties of AISI 316L austenitic stainless steel
Message:
Abstract:
The aim of this study is investigating the effects of plasma nitriding on the bulk mechanical properties, including tensile properties of AISI 316L austenitic stainless steel (in adition to surface properties). In order to reach this goal, the tensile properties of 316L stainless steel have been studied before and after plasma nitriding process. Plasma nitriding process carried out at two constant temperatures of 450 and 500 ºC with gas composition of 75vol.%H2-25vol.%N2 for 5 hours. To evaluate the effect of plasma nitriding process on the tensile properties, a simple tension test was carried out at speed of 5 mm/min. To evaluate the surface hardness, the Vickers microhardness test was used with the indentation loads of 50, 100, 300 and 500 g.f. The microstructural study of the cross section and phase analysis were performed by scanning electron microscope and X-ray diffraction, respectively. Changes in nitrogen concentration in cross section were evaluated by energy dispersive spectroscopy. Results showed that the plasma nitriding process at 450 ºC increased the yield strength from 320 to 340 MPa and tensile strength from 570 to 595 MPa. Moreover, by increasing the temperature from 450 to 500 ºC, yield and tensile strengths were increased to 355 and 610 MPa respectively. The surface hardness enhanced from 230 to almost 1000 HV by plasma nitriding at 450 ºC. By elevating the process temperature from 450 to 500 ºC, hardness was increased to nearly 1250 HV. In overall, plasma nitriding not only improved surface properties but also enhanced bulk properties of AISI316L stainless steel significantly.
Language:
Persian
Published:
Iranian Journal of Surface Science and Engineering, Volume:11 Issue: 23, 2015
Pages:
25 to 37
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