Detail publikace

IMPROVEMENT OF WORK ROLL SERVICE LIFE BY MICROSTRUCTURE SIMULATION

ZAHRADNÍK, R. RAUDENSKÝ, M.

Originální název

IMPROVEMENT OF WORK ROLL SERVICE LIFE BY MICROSTRUCTURE SIMULATION

Typ

článek ve sborníku ve WoS nebo Scopus

Jazyk

angličtina

Originální abstrakt

The work roll surface in hot rolling mills suffers combined heat and mechanical load. The surface degradation leads to the formation of crack networks. The current research describes a thermal fatigue similar to the governing degradation mechanism, which causes the cracks formation perpendicular to surface. This paper describes the additional effect of cyclic thermal loads – the cause of parallel-to-surface cracks formation within long and thin carbides which is prone to forming inside HiCr steel. The cracks formation is investigated by both a thermal and a structure FEA. These analyses are conducted with a special finite element model which has a steel microstructure. The model is exposed to a thermal load at the end of the rolling gap. The result – the heterogeneous thermal field is applied like a BC for the structure analysis. The results are presented by a histogram of relative frequency of the first principal stress value, for each microstructure portion separately. The distribution of the first principal stress within the matrix shows a compressive stress state, which was anticipated. The distribution of the first principal stress within the carbide portion shows a tensile stress state, which was unexpected. This unexpected behavior is explained by a different thermal expansion coefficient of each portion of the microstructure. The matrix with a higher thermal expansion coefficient expands more rapidly than carbides which are pressed from a surrounding matrix which forces them to lengthen, and which, in turn, cause tensile stress within carbides. Based on the comparison with a microstructure typical to HiCr iron, the recommendation for a more durable and resistant microstructure structure are stated and explained.

Klíčová slova

Work rolls, hot rolling, microstructure, crack, formation, thermal fatigue

Autoři

ZAHRADNÍK, R.; RAUDENSKÝ, M.

Rok RIV

2014

Vydáno

21. 5. 2014

Nakladatel

Tanger Ltd.

Místo

Ostrava

ISBN

978-80-87294-54-3

Kniha

METAL 2014, 23rd International Conference on Metallurgy and Materials, Conference Proceedings

Strany od

1

Strany do

6

Strany počet

6

BibTex

@inproceedings{BUT107766,
  author="Radek {Zahradník} and Miroslav {Raudenský}",
  title="IMPROVEMENT OF WORK ROLL SERVICE LIFE BY MICROSTRUCTURE SIMULATION",
  booktitle="METAL 2014, 23rd International Conference on Metallurgy and Materials, Conference Proceedings",
  year="2014",
  pages="1--6",
  publisher="Tanger Ltd.",
  address="Ostrava",
  isbn="978-80-87294-54-3"
}