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Mn Diffusion at Early Stage of Intercritical Annealing of 5Mn Steel

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Abstract

Mn distribution and austenite morphology at the early stage of intercritical annealing of 5Mn steel were investigated. It was experimentally demonstrated that a newly formed 20 nm-thick austenite was formed without the partitioning of Mn. The elemental analysis confirmed that the growth of austenite should be controlled by the diffusion of C prior to the diffusion of Mn at a low heating rate. The austenite growth started under negligible-partitioning local equilibrium mode and then switched to partitioning local equilibrium mode. Mn segregation at the γ/α interface suggested that the collector plate mechanism was the essential way of Mn partitioning at the early stage of austenite growth.

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Correspondence to Xi-nan Luo or Xiao-yan Zhong.

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Foundation Item: Item Sponsored by National Basic Research Program of China (2010CB630800, 2015CB921700); National Natural Science Foundation of China (51001064, 51471096); Specialized Research Fund for the Doctoral Program of Higher Education of China (20100002120047); Tsinghua University Initiative Scientific Research Program (20141081200)

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Luo, Xn., Zhong, Xy., Luo, Hw. et al. Mn Diffusion at Early Stage of Intercritical Annealing of 5Mn Steel. J. Iron Steel Res. Int. 22, 1015–1019 (2015). https://doi.org/10.1016/S1006-706X(15)30105-9

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  • DOI: https://doi.org/10.1016/S1006-706X(15)30105-9

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