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Effect of carbon content between 0.3% and 0.8% on steel toughness
Oct 18, 2018

The carbon content of the hypoeutectoid steel is between 0.3% and 0.8%, and the pro-eutectoid ferrite is a continuous phase and is first formed at the austenite grain boundary. Pearlite is formed in austenite grains and accounts for 35% to 100% of the microstructure. In addition, a variety of aggregated structures are formed in each austenite grain to make the pearlite polycrystalline.


Since the pearlite strength is higher than that of the pro-eutectoid ferrite, the flow of the ferrite is limited, so that the yield strength and the strain hardening rate of the steel increase as the carbon content of the pearlite increases. The limiting effect increases with the number of hardened blocks, and the pearlite is enhanced by the refinement of the pre-eutectoid grain size.


When there is a large amount of pearlite in the steel, micro-cleavage cracks are formed at low temperatures and/or high strain rates during the deformation process. Although there are some internal aggregated tissue sections, the fracture channels initially travel along the cleavage plane. Therefore, there are some preferred orientations within the ferrite grains between the ferrite sheets and adjacent aggregated structures.

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