Abstract
The combined effects of cementite particles, grain boundaries, and subgrain boundaries on the room temperature yielding behavior of spheroidized, plain carbon steels were investigated. Spheroidization by austenitizing and quenching, followed by annealing at temperatures just under theA 1 temperature, produced a subgrain-connected cementite particle distribution. The subgrain size, λl,p, stabilized by the particles governs the yield stress via the relationσ y = 9.5 + 1.33 λl,p -1/2, kgf/mm2 In contrast, austenitizing and quenching, followed by thermal cycling about theA 1 temperature, produced microstructures with a large fraction of intraboundary, subgrain-free cementite particles. The lower yield stress of these steels could not be accounted for by either the Orowan or the Ansell-Lenel theory. The yield stress is predominantly controlled by the ferrite grain size, λg, via the relationσ y = 12.4 + 1.87 λg -1/2, kgf/mm2 The intraboundary particles contribute only a small strain-hardening term which increases the value of the friction stress (12.4 kgf/mm2) over that associated with grain boundary strengthening alone (8.8 ± 0.8 kgf/mm2).
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