CARMEN PENELOPI PAPADATU, ANDREI VICTOR SANDU, MARIAN BORDEI, IOAN GABRIEL SANDU STRUCTURAL CHANGES IN THE SUPERFICIAL LAYERS OF A NON-CONVENTIONAL TREATED STEEL SUBJECTED TO A WEAR PROCESS It was considered a non - conventional treatment in magnetic field applied before the thermo-chemical treatment (nitro-carburizing in plasma), for one alloyed steel which is used in Machinery building industry. These researches have been made in order to improve the mechanical properties of Chromium-Molybdenum alloyed steel non-conventionally treated in a magnetic field. Through the thermo-magnetic treatment, applied before the plasma nitro-carburizing, the mechanical properties of this material have been improved, especially in this case of the steel with a considered content of Chromium (1.38%). These researches, through X-Ray diffractometry of the behavior of the superficial layers during the dry wear process, completed this work. The diffractometric characteristics of the superficial layers which have been obtained after a complex system of thermo-magnetic treatments followed by a thermo-chemical treatment, the superficial layers content and the behavior of the steel at the wear through dry friction tests were used as criterion. The paper is a review of the researches from the last few years.
Keywords: magnetic field, thermo-magnetic treatments, nitro-carburized layer, diffractometric characteristics