Revealing the influence of Mo addition on interphase precipitation in Ti-bearing low carbon steels

Journal article (2022)

Authors

Haokai Dong Tsinghua University, South China University of Technology
Hao Chen Tsinghua University
Ahmadreza Riyahi khorasgani Center for Interface-Dominated High Performance Materials
Boning Zhang Tsinghua University
Yongjie Zhang Tohoku University
Zhenqiang Wang Harbin Engineering University
Xiaosheng Zhou Tsinghua University
Wei Wang Baosteel Research Institute
S. van der Zwaag Novel Aerospace Materials - Aerospace Engineering , Tsinghua University
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Research Group
Novel Aerospace Materials (Aerospace Engineering) (TU Delft)
Copyright: © 2022 Haokai Dong, Hao Chen, Ahmadreza Riyahi khorasgani, Boning Zhang, Yongjie Zhang, Zhenqiang Wang, Xiaosheng Zhou, Wei Wang, S. van der Zwaag, More Authors
DOI
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https://doi.org/10.1016/j.actamat.2021.117475
Interphase precipitation (Ti, Mo)C Carbide nucleation Coarsening resistance Interfacial energy Trans-interface diffusivity
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Published Date

2022

Language

English

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Faculty

Aerospace Engineering

Department

Aerospace Structures & Materials

Research Group

Novel Aerospace Materials

Abstract

Mo is widely used as an effective microalloying element to improve mechanical performance of interphase precipitation steels, but the precise role of Mo in interphase precipitation behavior is not fully understood. In this contribution, interphase precipitation behavior in a series of Ti-Mo-bearing low carbon steels is systematically studied, and the role of Mo in interphase precipitates and its coarsening behavior is revisited. It is found that (Ti, Mo)C precipitates instead of TiC are formed in the Mo-containing alloys, and the average site fraction of Mo in (Ti, Mo)C is almost independent of the bulk Mo content. Moreover, the number density of interphase precipitates can be substantially enhanced by a minor addition of Mo, albeit it does not further rise with increasing the bulk Mo content. This is because the Mo fraction in (Ti, Mo)C rather than the bulk Mo content governs the driving force for precipitation nucleation and the interfacial energy of the (Ti, Mo)C/α and (Ti, Mo)C/γ interfaces. In addition to the reduced interfacial energy, decrease of Ti trans-interface diffusivity has been identified as another key reason for the enhanced carbide coarsening resistance in Mo-containing alloys.

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