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Chro-austempering treatment of a medium-carbon high-strength bainitic steel

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Abstract

The integrated processing of chromizing and austempering (termed chro-austempering) treatments was proposed. The microstructure and properties of a medium-carbon high-strength bainitic steel treated by chro-austempering treatments were investigated by metallography, scanning vibrating electrode technique, electrochemical workstation, and microhardness test. The results show that the high-strength bainitic steel with carbide-free bainite as matrix and the chromized layers on surfaces was successfully fabricated by chro-austempering treatment. The hardness of surface layers was about 3.5 times that of the bainite matrix. Meanwhile, the corrosion started from exposed bainitic matrix and proceeded along the depth direction, testifying that the surface corrosion resistance was significantly improved by chro-austempering treatment due to the formation of Cr7C3 and (Cr, Fe)7C3 on the surface.

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Funding

The National Natural Science Foundation of China (NSFC) (51874216 and 52104381), the Key Project of Hebei Iron and Steel Group (HG219313), the Open Fund of Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking (KF-20-4), Natural Science Foundation of Hubei (2021CFB127), and China Postdoctoral Science Foundation (2021M702539).

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Authors and Affiliations

  1. The State Key Laboratory of Refractories and Metallurgy, The Key Laboratory for Ferrous Metallurgy and Resources Utilization of Ministry of Education, The Collaborative Innovation Center for Advanced Steels of Ministry of Education, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Man Liu, Jun-yu Tian, Feng Cai, Cheng-gang Pan & Guang Xu

  2. Hubei Provincial Key Laboratory for New Processes of Ironmaking and Steelmaking, Wuhan University of Science and Technology, Wuhan, 430081, Hubei, China

    Jun-yu Tian

Authors
  1. Man Liu
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  2. Jun-yu Tian
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  3. Feng Cai
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  4. Cheng-gang Pan
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  5. Guang Xu
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Correspondence to Jun-yu Tian or Guang Xu.

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The authors declare no conflict of interest. The funding sponsors had no role in the design of the study, in the collection, analyses, or interpretation of data, in the writing of the manuscript, or in the decision to publish the results.

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Liu, M., Tian, Jy., Cai, F. et al. Chro-austempering treatment of a medium-carbon high-strength bainitic steel. J. Iron Steel Res. Int. 30, 317–327 (2023). https://doi.org/10.1007/s42243-022-00811-6

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  • DOI: https://doi.org/10.1007/s42243-022-00811-6

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