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I. A. Neacșu, B. Scheichl, H. Rojacz, G. Vorlaufer, M. Varga, H. Schmid, J. Heiss:
"Transient thermal-stress analysis of steel slag pots: impact of the solidifying-slag layer on heat transfer and wear";
Steel Research International, 87 (2015), 6; 720 - 732.

The containers used for steel slag transportation to the recycling depot undergo high temperature gradients and often deform plastically. Also, parts of the thereby solidified slag adhere to the pot walls, causing demoulding problems and wear. A thorough finite-element analysis of the heat transfer, initiated by filling the pots and essentially driven by radiation, and the thermal stresses is performed. Due to periodic fill-in and discharge, these are assumed to admit a quasi-stationary state referring to the pot temperature before their emptying. The so obtained results aid optimising the pot shape and the transport process in terms of minimising maintenance and anti-adhesive cladding. A layer of solidified slag is found to exist throughout the transport process. Although the phase change occurs almost instantaneously at a liquid-solid interface, the "mushy" zone is considered in the accompanying analytical study of the associated Stefan-type problem. Good correlations of the predicted temperatures to the measured ones and the resultant surface damaging are obtained.

cast steel, finite-element modelling, solidification, Stefan problem, thermal-stress management

http://dx.doi.org/10.1002/srin.201500203

http://publik.tuwien.ac.at/files/PubDat_240536.pdf