Abstract
In this study, a combined process of hot isostatic pressing and hot rolling (HIP-rolling) is developed to prepare high-performance powder metallurgical (PM) low alloy ultrahigh strength steel. The HIP-rolled 30CrMnSiNi2A steel achieves ultrahigh ultimate tensile strength of 1823.6 MPa, high elongation of 17.6% and superior impact energy of 29.4 J. The formation of lower bainite/martensite duplex structure, the refinement of prior austenite grains and blocks, and the disruption of prior particle boundaries are the critical factors to achieve the excellent strength-toughness balance. This study provides a novel insight for the development and application of PM low alloy ultrahigh strength steel.
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