Atom Probe and MûÖssbauer Spectroscopy Investigations of Cementite Dissolution in a Cold Drawn Eutectoid Steel

Na Min1,2),Wei Li2),Hongyan Li2) and Xuejun Jin2) 1) School of Materials Science and Engineering,Shanghai University,Shanghai 200072,China 2) School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China

Õª Òª£ºMûÖssbauer spectrum and three dimensional atom probes£¨3DAP£© were combined to investigate the mechanism of cementite dissolution in a cold-drawn eutectoid steel at a true strain of 2.89.The experimental results suggest that the dislocations play an important role in the dissolution of the cementite by sweeping across the nano-scaled cementite,and transferring carbon from cementite to ferrite inducing cementite decomposition.The mechanism of cementite dissolution in the steel is discussed in association with the investigation of nonstoichiometric cementite structure after heavy deformation.

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