Abstract
The aim of this work was to develop a new heat treatment technology, which allowed an ultrafine-grained multiphase microstructure in 35CrSiMn5-5-4 structural steel to be obtained. This microstructure was produced by the heat treatment, usually applied to TRIP steels, but with an additional pre-heat treatment step. It was shown that the additional pre-heat treatment resulted in a radical change of the microstructure which became more homogenous and much more fine-grained in comparison with the conventional TRIP steel microstructure. TEM observations revealed the microstructure composed of a mixture of ultra-fined grains of ferrite, bainite and retained austenite. Owing to the pre-heat treatment, 35CrSiMn5-5-4 steel gains higher strength and plasticity parameters in comparison to the steel after the treatment without the preliminary heat treatment.
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