Rolling of round bar made of steel 32CrB4 was simulated physically. The interrupted torsion test led to the fi nalmicrostructure with coarser grains, however, thanks to comparatively large dimensions of the sample this type ofexperiment was not so sensitive to the cooling rate of the fi nal cooling as compression test. Too high temperatureof the end of controlled cooling of the samples after compression test led to partial self-quenching of the investigatedmaterial. Decelerated cooling below the temperature of the start of martensitic transformation led in bothapplied types of compression tests to the parameters of the resulting microstructure and hardness closest to theparameters obtained after laboratory rolling.
展开▼
