Toughness enhancement of low carbon steel through bainitic transformation
DOI:
https://doi.org/10.22517/23447214.25161Keywords:
Toughness, Charpy impact test, dual-phase steel, bainitic transformation.Abstract
This study investigates the effect of continuous cooling treatment on the impact toughness and ductile-brittle transition temperature of a low carbon ferrite-pearlite dual-phase steel.
Impact testing was performed according to ASTM E23 at temperatures ranging from -60ºC to 90ºC. The results indicate a significant increase in toughness of approximately 64% and a
reduction in the ductile-brittle transition temperature from 50ºC in the as-received condition to 0ºC after heat treatment. These changes were analyzed through microstructural examination and fractographic analysis. A bainitic transformation was observed,
leading to microstructural refinement and an associated toughness improvement. Additionally, a change in fracture surface morphology was noted in the heat-treated steel, as the bainitic transformation resulted in an increased ductile fracture area across the tested temperature range.
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