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Dislocation Pipe Diffusion of Mn during Annealing of 5Mn Steel

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Abstract

The dislocation pipe diffusion of Mn during annealing of 5Mn steel was experimentally investigated using transmission electron microscopy (TEM). Many dislocations existed inside the ferrite and terminated at the α/γ interface of the sample after intercritical annealing at 650 °C for 1 min. Line scans of Mn distribution demonstrated a high Mn concentration in austenite and Mn enrichment at dislocations, indicating that the dislocation pipe diffusion of Mn during intercritical annealing occurred in addition to the γ/α interface diffusion. In-situ TEM observations at 500 °C revealed that due to Ostwald ripening, large cementite precipitates grew while small cementite precipitates dissolved via Mn diffusion along the dislocations between them.

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Authors and Affiliations

  1. National Center for Electron Microscopy in Beijing, Key Laboratory of Advanced Materials (MOE), State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China

    Jie Lin (Master Candidate), Xi-nan Luo, Xiao-yan Zhong (Doctor, Associate Professor) & Hui-hua Zhou

  2. Central Iron and Steel Research Institute, 100081, Beijing, China

    Cun-yu Wang, Jie Shi & Han Dong

Authors
  1. Jie Lin
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  2. Xi-nan Luo
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  3. Xiao-yan Zhong
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  4. Hui-hua Zhou
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  5. Cun-yu Wang
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  6. Jie Shi
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  7. Han Dong
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Corresponding authors

Correspondence to Jie Lin or Xiao-yan Zhong.

Additional information

Foundation Item: Item Sponsored by National Key Research and Development Program of China (2016YFB0700402); National Basic Research Program of China (2010CB630800, 2015CB921700); National Natural Science Foundation of China (51671112, 51471096, 51390471, 11374174); Tsinghua University Initiative Scientific Research Program (20141081200, 20131089311)

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Lin, J., Luo, Xn., Zhong, Xy. et al. Dislocation Pipe Diffusion of Mn during Annealing of 5Mn Steel. J. Iron Steel Res. Int. 23, 1277–1280 (2016). https://doi.org/10.1016/S1006-706X(16)30188-1

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  • DOI: https://doi.org/10.1016/S1006-706X(16)30188-1

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