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University of Zenica , Zenica , Bosnia and Herzegovina
University of Zenica , Zenica , Bosnia and Herzegovina
The basic characteristics of the chemical composition of steel with improved machinability (X8CrNiS18-9) are the increased content of sulphur (0.15-0.45%), phosphorus (0.07-0.11%) and manganese (0.5-1.5%). Sulphur by creating sulphide inclusions reduces friction and cutting resistance, and increases the brittleness of the chip.Considering its harmful effect in steel, as well as the fact that non-metallic inclusions have been insufficiently tested for this type of high-alloyed steel, the aim of this research is to determine by microalloying the possibility of modification of non-metallic inclusions. Modification with boron and zirconium favorably affects the ductile properties of steel, and a step forward in this study is a modification of inclusions with tellurium. It is of particular importance to determine the behavior of non-metallic inclusions in the process of production of the structural part and in subsequent exploitation. Therefore, plastic processing of austenitic stainless steel was also carried out, forging and rolling with two different level of processing.
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