Evaluation of the quality of materials used for hot rolling mill rolls, by their heat-resistance

N. V. Polyakova

Abstract


Purpose. High-chromium cast iron and high speed steel are used for rolling mill rolls production. In hot rolling processes tool’s failure can be result from the combination of thermo-mechanical and chemical damage. A better knowledge of thermal fatigue destruction mechanisms in this material could be useful for a better appreciation of its service behaviour and lifetime. Methodology. The experimental spesimens of high-chromium cast iron and high speed steel were tested by mode : 200 cycles the heating to 600 °C and cooling to 20 °C. The changes in the microstructure and microhardness of structural components after tests are evaluate. Findings. The results of studies of materials used for rolling mill rolls production tendency to the destruction caused by thermal fatigue are presented. The influence thermal cycling  on structure and properties high chromium cast iron and high speed steel was investigated. The tendency of white cast iron to thermal fatigue damage was shown. Peculiarities of thermal cracks nucleation and growth were studied. Microhardness of structural components after the tests was measured. The structural changes that occur during thermal cycling were analyzed. Practical value. It may be recommended to take into account thermal stability of materials hot rolling mill rolls as an additional criterion of quality.


Keywords


high chrome cast iron; high speed steel; rolling mill rolls; thermal fatigue; thermal cycling

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