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Effect of Mn and P on precipitation behavior and solute distribution in ultra-low carbon bake hardening steels

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Abstract

The effect of Mn and P on types of precipitates as well as solute distributions in ultra-low carbon bake hardening (ULC-BH) steels was originally investigated in this paper. Three samples of hot-rolled ULC-BH steels (Ti–V, Ti–V–Mn, and Ti–V–P) were prepared. The types of precipitates in the three samples were characterized with scanning electron microscopy (SEM) and transmission electron microscopy (TEM), and further calculated by Thermo-Calc. The different types of nanometer sized vanadium carbides are clearly characterized by SEM and TEM, and results of calculation and experiments are generally in agreement. Besides, the solute distributions in Ti–V–Mn and Ti–V–P steels were detected by three-dimensional atom probe (3DAP). It is found that no Ti, N, or S elements are present in both of the two steels, and the distribution patterns of the solute elements in the two steels are completely determined. Results show that SEM, TEM combining with 3DAP can well detect the existence of elements added into the bake hardening steels, and are very useful techniques for the base of the further investigation of mechanical properties and bake hardening phenomenon in bake hardening steels.

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Acknowledgements

The authors are grateful to National Basic Research Program of China (973) under Grant No. 2010CB630802 for the project funding, National Nature Science foundation of China program under Grant Nos. 50934011 and 50971137 for their financial supports. Dr. Liu Wenqing and Mr. Peng Jianchao are also acknowledged for their help in 3DAP test and TEM measurement.

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Authors and Affiliations

  1. College of Materials Science and Engineering, Shanghai University, Shanghai, 200072, China

    Hua Wang, Naqiong Zhu, Wen Shi & Lin Li

  2. Ansteel Group Co, Anshan, 114021, China

    Rendong Liu

  3. Room 403, Metal Building, No. 149, Shanghai University, Yanchang Road, Shanghai, 200072, China

    Hua Wang

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  1. Hua Wang
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  2. Naqiong Zhu
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  3. Wen Shi
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Correspondence to Hua Wang.

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Wang, H., Zhu, N., Shi, W. et al. Effect of Mn and P on precipitation behavior and solute distribution in ultra-low carbon bake hardening steels. J Mater Sci 46, 2982–2990 (2011). https://doi.org/10.1007/s10853-010-5175-z

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  • DOI: https://doi.org/10.1007/s10853-010-5175-z

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