Characterization of Carbide Precipitation during Tempering for Quenched Dievar Steel

Carbide precipitation and coarsening are investigated for quenched Dievar steel during tempering. Lath/lenticular martensite, retained austenite, lower bainite, auto-tempered, and larger spherical carbides are all observed in the as-quenched condition. The carbide precipitation sequence on tempering is ascertained to be: M(8)C(7) + cementite → M(8)C(7) + M(2)C + M(7)C(3) → M(8)C(7) + M(7)C(3) + M(23)C(6) → M(8)C(7) + M(7)C(3) + M(23)C(6) + M(6)C; carbides become coarser on tempering, and the sizes for inter-lath carbides increase noticeably with increasing tempering temperatures due to the faster grain boundary diffusion, whereas the sizes for intra-lath carbides remain nearly constant. The rate of coarsening for carbides by tempering at 650 °C is much higher than those by tempering at 550 °C and 600 °C, due to the faster diffusion of alloying elements at higher temperatures.