Process And Its Basic Allpication Of Surface Hardening Of Austenitic Stainless Steel At Low Temperature

Low-temperature plasma surface hardening treatment technology can improve the surface hardness and wear resistance not reduce the corrosion resistance of austenitic stainless steel . In this paper, process of plasma carburizing of austenitic stainless steel at low temperature, and its technology, theory has been researched. The microstructure, surface hardness, phase composition, corrosion property and Carbon content of the hardened layer were analyzed by optical microscope, vickers hardness tester, X-ray diffraction (XRD), polarization testing technique, blasting Test and vibration pulse test.First tested by orthogonal of plasma carburizing of austenitic stainless steel at low temperature, carburizing time, the propane gas flow rate and other factors on the impact of carburized layer, optimized low-temperature plasma carburized austenitic stainless steel processing parameters, and forecast optimization of process parameters was validated. Using Fick second law of diffusion treatment on the optimal process of diffusion of carbon austenitic stainless steel surface, the numerical simulation of the pattern, and with the measured carbon concentration carburizing stainless steel surface were compared to verify the feasibility of the optimization process .Based on the process optimization, the low-temperature plasma surface hardening of austenitic stainless steel processing technology has been used for ferrule of the surface hardening treatment, the treated stainless steel in line with the national standard (GB/T 3765-2008), has been available in volume industrial production.This paper also studied the use of active screen technology for surface hardening of austenitic stainless steel and this is a new technology. The results show that The results show that low temperature active screen plasma carburizing under≤550℃, whether it is the hardness of carburized layer, the hardness gradient, thickness and corrosion resistance of plasma carbon same as DC plasma carburizing. At the same time active screen plasma carburizing also solves some problems associated with the conventional DC plasma carburizing.