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Relationship between carbon segregation and the carbide precipitation along grain boundary based on the structural unit model

  • Metals & corrosion
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Abstract

Intragranular embrittlement is key to the weakening of properties of ultra-supercritical applied materials as HR3C heat-resistant steel in service and is considered to be related to the structure of grain boundary and the precipitation of carbides. In this work, the structural unit model was applied to study the structure of grain boundary and carbide formation with molecular dynamics simulation, and then, the precipitation tendency of carbides was analyzed through the structural similarity between grain boundary and carbide by using radial distribution function of the metal atom. At the same time, an electron backscatter diffraction study on serviced and treated HR3C heat-resistant steel was used for experimental exploration. Results show that the structural similarity between grain boundary and carbide depends on the grain boundary angle, wherein the structural similarity between grain boundary and carbide is higher for the grain boundary angle of 20–50°, while it is lower at the grain boundary angle close to 60° or smaller than 20°. The structure of Cr23C6 and Cr7C3 carbides is more similar to the local structure of grain boundary than that of Cr3C2 carbide. The grain boundary angle study on HR3C heat-resistant steel shows that the high content of 20–50° grain boundary indeed increases the precipitation of carbides, which is proposed to reduce the proportion of 20–50° grain boundaries by a proper procedure of cold deformation + heat treatment as 20% + 900 °C/6 h.

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Funding

This study was funded by the National Natural Science Foundation of China (Grant Nos. U1610256, 51901035 and 51771042), the National High Technology Research and Development Program of China (The 863 Program) (Grant No. 2015AA034402) and the Dalian University of Technology Fundamental Research Fund (Grant No. DUT19RC(4)010).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Dalian University of Technology, Dalian, 116024, China

    Tieshan Cao, Congqian Cheng, Hongbo Xv & Jie Zhao

  2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, China

    Tieshan Cao

  3. Department of Materials Science and Engineering, Southern University of Science and Technology, Shenzhen, 518055, China

    Fei Ye

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  1. Tieshan Cao
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  2. Congqian Cheng
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Correspondence to Jie Zhao.

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Cao, T., Cheng, C., Ye, F. et al. Relationship between carbon segregation and the carbide precipitation along grain boundary based on the structural unit model. J Mater Sci 55, 7883–7893 (2020). https://doi.org/10.1007/s10853-020-04537-2

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  • DOI: https://doi.org/10.1007/s10853-020-04537-2

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