Abstract

1. Raising the austenitizing temperature of steels 34KhN1M and 35KhN1M2F from 900 to 1280° leads to an increase of the initial bainitic transformation temperature and an associated increase in the quantity of upper bainite after quenching, which is manifest in lower bainitic hardenability. 2. With reheating to 900° of steel 34KhN1M previously quenched from 1280°, the austenite grains are refined, the bainitic transformation temperature decreases, and the bainitic hardenability increases to the level observed after quenching from 900°. 3. With slow heating to 900° of steel 35KhN1M2F previously quenched from 1280° the original coarse grained structure is restored due to the ordered α→γ transformation; the elevated bainitic transformation temperature is retained and the bainitic hardenability is lowered.

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