Abstract
Neutron diffraction measurements have revealed that cementite peaks disappear in a pearlite steel with drawing and that the residual intergranular stresses are generated. The diffraction profiles in a heavily drawn specimen suggest the tetoragonality with a small c/a in the ferrite matrix. Although cementite was hardly observed in the heavily drawn specimen, its c/a value determined by neutron diffraction and mechanical behavior are quite different from those of as-quenched martensite. The changes in hardness and c/a with annealing or tempering were also different between heavily drawn pearlite and marteniste. Hence, most of carbon atoms do not exist inside the ferrite lattice in the drawn pearlite and multi-scaled heterogeneous plastic deformation in pearlite seems to affect the asymmetry in the diffraction profile. Fracture behavior and hardness change with tempering is different in the two microstructures.
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Shiota, Y., Tomota, Y., Moriai, A. et al. Structure and mechanical behavior of heavily drawn pearlite and martensite in a high carbon steel. Met. Mater. Int. 11, 371–376 (2005). https://doi.org/10.1007/BF03027507
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DOI: https://doi.org/10.1007/BF03027507