Effect of Zr additions on non-metallic inclusions in X11CrNiMo12 steelBurja, Jaka (Avtor) Koležnik, Mitja (Avtor) Šetina, Barbara (Avtor) Medved, Jože (Avtor) clean steelnon-metallic inclusionsZr additioncreep-resistant steelmicrostructureThe production of clean steel is associated with high-quality steel grades for demanding applications. The formation of oxide inclusions mainly depends on the deoxidation practice; it is usually carried out through Al additions, but alumina inclusions can have detrimental effects. An alternative zirconium inclusion modification was used in a creep-resistant steel to improve the cleanliness of laboratory-made steel. The thermodynamics behind the inclusion modification are presented, the reaction products are identified and the steel cleanliness improvement is quantified. The resulting influence of zirconium addition on non-metallic inclusions and mechanical properties is discussed. While the Zr additions drastically reduce the non-metallic inclusion size and area, additions above a certain amount result in the formation of zirconium nitrides that ultimately soften the martensitic steel due to the depletion of nitrogen in solid solution.20202022-01-04 15:42:17Članek v reviji134280UDK: 621:669:67.017ISSN pri članku: 2075-4701DOI: 10.3390/met10091183COBISS_ID: 27175683sl