Abstract
A feasible method of enhancing the impact toughness (−20 °C) of high-temperature hot-rolled HSLA steels was proposed. The results show that the toughness of the improved hot-rolled steel containing TiOx-CaO-ZrO2 oxide particles was significantly enhanced by ∼132 J compared with conventional steel containing Al-Ca oxide particles. The fine (Ti, Ca, Zr) Ox particles with high-density of ∼937 counts/mm2 significantly promotes anti-cracking acicular ferrite (AF) nucleation. Moreover, the fractional volume of AF increased from ∼79 % to ∼85 % when the rolling temperature was increased from ∼1055 °C to ∼1085 °C.
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