Abstract
1. After small plastic deformation (0.2\2-1.2%) and aging, steel 38Kh5MSFA is susceptible to strain aging, which is manifest in an increase of the ultimate strength and yield strength and decrease of elongation. The yield strength increases more than the ultimate strength. At a deformation of 0.6% and higher, followed by aging, σ0.1/σb is close to unity. The effect of strain aging on the mechanical properties is manifest in the different original conditions after low- and high-temperature tempering. However, the effect is stronger after low-temperature tempering. 2. Strain aging occurs at room temperature but is more evident at higher aging temperatures up to 300\dgC. 3. Strain aging raises the cold-brittleness threshold but has little effect on the work of crack propagation.
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