Effect of Zr Additions on Non-Metallic Inclusions in X11CrNiMo12 Steel

Metals

Jožef Medved¹  Jaka Burja²  BarbaraŠetina Batič²  Mitja Koležnik³ 

[1] Department of Materials and Metallurgy, Faculty of Natural Sciences and Engineering, University of Ljubljana, Aškerčeva cesta 12, SI-1000 Ljubljana, Slovenia;Institute of Metals and Technology, Lepi pot 11, SI-1000 Ljubljana, Slovenia;Metal Ravne d.o.o., Koroška cesta 14, SI-2390 Ravne na Koroškem, Slovenia;

关键词: clean steel;    non-metallic inclusions;    Zr addition;    creep-resistant steel;    microstructure;   

DOI  :  10.3390/met10091183

来源: DOAJ

【 摘 要 】

The 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.

【 授权许可】

Unknown