Abstract
The microstructure of steel after quenching consists of martensite and residual austenite. Depending on the tempering temperature and the carbon content in the hardened steel, the following structural changes occur: the transformation of residual austenite into martensite, the decay of martensite into troostite or sorbitol, and with prolonged high—temperature tempering and annealing — into a ferrite-perlite structure. This article describes the kinetics of the decay of martensite during tempering using computer metallography, based on the obtained photos of the microstructure. The article will be useful for a deeper understanding of the process of decomposition of martensite during tempering.
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