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Microstructural Evolution and Mechanical Properties of Short-Term Thermally Exposed 9/12Cr Heat-Resistant Steels

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Abstract

The microstructural evolution during short-term (up to 3000 hours) thermal exposure of three 9/12Cr heat-resistant steels was studied, as well as the mechanical properties after exposure. The tempered martensitic lath structure, as well as the precipitation of carbide and MX type carbonitrides in the steel matrix, was stable after 3000 hours of exposure at 873 K (600 °C). A microstructure observation showed that during the short-term thermal exposure process, the change of mechanical properties was caused mainly by the formation and growth of Laves-phase precipitates in the steels. On thermal exposure, with an increase of cobalt and tungsten contents, cobalt could promote the segregation of tungsten along the martensite lath to form Laves phase, and a large size and high density of Laves-phase precipitates along the grain boundaries could lead to the brittle intergranular fracture of the steels.

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Acknowledgments

This work was financially supported by National Basic Research Program of China (No. 2008CB717802), Knowledge Innovative Program of The Chinese Academy of Sciences (No. KJCX2-YW-N35), and National High Tech Program (No. 2009GB109002).

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Authors and Affiliations

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

    Wei Wang (Research Associate), Wei Yan (Associate Professor), Yiyin Shan (Professor) & Ke Yang (Professor)

  2. School of Planning, Architecture & Civil Engineering, Queen’s University Belfast, Belfast, BT9 5AG, U.K.

    Wei Sha (Professor)

Authors
  1. Wei Wang
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  2. Wei Yan
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  3. Wei Sha
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  4. Yiyin Shan
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Correspondence to Yiyin Shan.

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Manuscript submitted December 16, 2011.

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Wang, W., Yan, W., Sha, W. et al. Microstructural Evolution and Mechanical Properties of Short-Term Thermally Exposed 9/12Cr Heat-Resistant Steels. Metall Mater Trans A 43, 4113–4122 (2012). https://doi.org/10.1007/s11661-012-1240-3

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