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Study on Laves phase in an advanced heat-resistant steel

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Abstract

The Laves phase is one of the most significant precipitates in ferritic/martensitic heat-resistant steels. Laves phase precipitates in the creep rupture specimens with different rupture life were studied on a 10 wt.% Cr heat-resistant steel. JMatPro thermodynamic and kinetic calculations were carried out to simulate and predict the precipitation behavior of the Laves phase in the steel at the equilibrium state. The morphologies of the Laves phase developed with creep time were characterized under both scanning electron microscope (SEM) and transmission electron microscope (TEM). Effects of Co on the growth behavior of Laves phase and the corresponding fracture mode were analyzed. It was found that the Laves phase in the steel grew to 200 nm in size after only 1598 h at 600°C, indicating that the addition of Co in the steel could accelerate the growth of Laves phase, and the coalescence of large Laves phase would lead to the brittle intergranular fracture.

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Ping Hu, Wei Yan, Wei Wang, Yi-yin Shan & Ke Yang

  2. Graduate School of Chinese Academy of Sciences, Beijing, 100049, China

    Ping Hu

  3. Metals Research Group, School of Planning, Architecture & Civil Engineering, Queen’s University of Belfast, Belfast, BT9 5AG, UK

    Wei Sha

  4. Sente Software Ltd., Surrey Technology Centre, Guildford, GY2 7YG, UK

    Zhan-li Guo

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  1. Ping Hu
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  2. Wei Yan
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  3. Wei Sha
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  4. Wei Wang
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  5. Zhan-li Guo
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  6. Yi-yin Shan
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  7. Ke Yang
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Correspondence to Ke Yang.

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Hu, P., Yan, W., Sha, W. et al. Study on Laves phase in an advanced heat-resistant steel. Front. Mater. Sci. China 3, 434–441 (2009). https://doi.org/10.1007/s11706-009-0063-7

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  • DOI: https://doi.org/10.1007/s11706-009-0063-7

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