Open AccessNon-Metallic Inclusions and Hot-Working Behaviour of Advanced High-Strength Medium-Mn Steels
Author(s) -
A. Grajcar,
Dariusz Woźniak,
Aleksandra Kozłowska
Publication year - 2016
Publication title -
archives of metallurgy and materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.258
H-Index - 29
eISSN - 2300-1909
pISSN - 1733-3490
DOI - 10.1515/amm-2016-0137
Subject(s) - materials science , microstructure , metallurgy , hot working , isothermal process , non metallic inclusions , scanning electron microscope , inclusion (mineral) , optical microscope , rare earth , composite material , mineralogy , thermodynamics , physics , chemistry
The work addresses the production of medium-Mn steels with an increased Al content. The special attention is focused on the identification of non-metallic inclusions and their modification using rare earth elements. The conditions of the thermomechanical treatment using the metallurgical Gleeble simulator and the semi-industrial hot rolling line were designed for steels containing 3 and 5% Mn. Hot-working conditions and controlled cooling strategies with the isothermal holding of steel at 400°C were selected. The effect of Mn content on the hot-working behaviour and microstructure of steel was addressed. The force-energetic parameters of hot rolling were determined. The identification of structural constituents was performed using light microscopy and scanning electron microscopy methods. The addition of rare earth elements led to the total modification of non-metallic inclusions, i.e., they replaced Mn and Al forming complex oxysulphides. The Mn content in a range between 3 and 5% does not affect the inclusion type and the hot-working behaviour. In contrast, it was found that Mn has a significant effect on a microstructure.