Abstract
1. The first stage of martensite decomposition is two-phase in rhenium steels with 0.3–1.4% C and 10–20% Re, and three-phase in steels with 1.6–1.7% C and 3–6% Re. 2. Increasing the carbon and rhenium concentrations of the steel lowers the rate of the first stage of decomposition. 3. With increasing concentrations of carbon in the steel the tetragonality of the ϰ martensite lattice increases, as a result of the larger elastic deformation of the lattice resulting from coherence with the lattice of precipitates rich in carbon.
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