Evolution of microstructure and mechanical properties during quenching and tempering of ultrahigh strength 0.3C Si–Mn–Cr–Mo low alloy steel

A strain rate sensitive constitutive model for quenched boron steel with tailored properties

“…The microstructure observed in Fig. 7c is that of ferritic bainite, as reported for similar materials/conditions by Feng et al [32], Tariq et al [33] and Saeglitz et al [34]. The characteristic features of ferritic bainite are a ferrite matrix with dispersed cementite particles [35e37].…”

Enhancement of mechanical properties and failure mechanism of electron beam welded 300M ultrahigh strength steel joints

“…Intergranular segregation can decrease the cohesive strength of grain boundaries and weaken them. Grain boundaries are therefore no longer strong enough to act as barrier to crack propagation and hence intergranular cracking can easily occur [28]. And the segregation of solutes and impurities at grain boundaries will be confirmed by EDS spectrum later.…”

Study on the microstructure and impact fracture behavior of martensitic alloy steels

“…Therefore, the resistance of the tempered specimen to fracture improved. Second, the transition carbides precipitated during the tempering process were coherent with the matrix, therefore hindering the motion of dislocations and, thus, raising the strength of the steel [27]. Additionally, segregation may be an important reason for the low impact toughness of specimens before tempering.…”