Journal of Mining and Metallurgy, Section B: Metallurgy - vol. 54 (1) B - 2018

U. Klančnik, B. Košec, P. Mrvar, J. Medved

Nonequilibrium solidification and microsegregation in centrifugally cast high speed steel for rolls

J. Min. Metall. Sect. B-Metall. 54 (1) B (2018) 59-66. DOI:10.2298/JMMB170109031K
Full text (pdf)
Export manuscript information:
RIS Format (EndNote, Reference Manager), BibTeX

Abstract

When regarding as-cast microstructures of highly alloyed metals, microsegregation of alloying elements is a common feature resulting from non-equilibrium conditions during solidification. The aim of this work is to predict the occurrence and severity of microsegregation in highly alloyed, centrifugally cast high speed steel used for rolls. The prediction was performed using thermodynamic Scheil-Gulliver modelling with Thermo-Calc software. The modelled predictions were then compared with differential scanning calorimetry, X-ray diffraction, light and electron microscopy with energy dispersive spectroscopy, all performed on an as-cast roll shell. Results show that chromium, molybdenum and vanadium have the highest tendency to microsegregation. Vanadium tends to form negative microsegregation, while molybdenum and chromium form positive microsegregation. Scanning electron microscopy revealed the presence of complex eutectic carbides, confirming the Scheil-Gulliver non-equilibrium solidification path via two main successive eutectic reactions.
Keywords: Microsegregation; High speed steel; Differential scanning calorimetry
Correspondence Address:
U. Klančnik, Valji, d.o.o.,
Štore, Slovenia
email: This email address is being protected from spambots. You need JavaScript enabled to view it.
Creative Commons License
This work is licensed under a
Creative Commons Attribution-
ShareAlike 4.0 International License