Vliv nízkoteplotní cementace u nerezových ocelí na opotřebení v automobilovém průmyslu

Abstract

This master´s thesis deals with a low temperature carburizing applicated on stainless steels AISI 304L and 310 (X2CrNi18-9 and X5CrNi25-20), and its influence on wear and coefficient of friction. Carburizing is used for increasing of surface hardness and improvement of resistance against wear and fatigue of components. The theoretical part is generally focused on friction, wear, carburizing and turbochargers used in automotive industry. The experimental part describes tribological tests, which were conducted at three different temperatures 300°C, 700°C and 850°C that represent the key temperatures inside the turbocharger and based on these temperatures, the suitability of low temperature carburizing usage will be determined for turbocharger components. Three material combinations were selected for the testing. The test results of low temperature carburizing applicated on stainless steels AISI 304L and 310 were compared with the reference material combination of HK30 (MIM) versus SS310 and consequently between themselves as well. The suitability of low temperature carburizing of stainless steels usage was determined. In future, the results might be verified by a component testing and other types of stainless steels with low temperature carburizing might be tested as well.