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Ultra-high Strength Steel Treated by Using Quenching–Partitioning–Tempering Process

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Advanced Steels

Abstract

Quenching–Partitioning–Tempering (Q–P–T) process is developed to yield ultra-high strength and high toughness steel based on Q–P process suggested by Speer et al. The chemical composition of Q–P–T steel is designed as <0.5C, 1.5Si (or Al), 1.5Mn, 0.02Nb, 0.2Mo (mass%) in which complex carbide precipitation during tempering may contribute further hardening; or <0.5C, 1.5Si, 1.5Mn (mass%) in which η (θ) carbide precipitation may offer strengthening beside the martensite formation. Ultimate tensile strength and total elongation of >2,000 MPa and >10%, ~1,500 MPa and ~15%, and ~900 MPa and ~20% are obtained with Q–T–P processed steels containing 0.4, 0.2 and 0.1C, respectively. Steels processed by Q–P–T generally contain ~5% retained austenite. Several examples are given in this article. The thermodynamics and kinetics as well as strengthening and toughing mechanisms for Q–P–T process are briefly discussed.

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Authors and Affiliations

  1. School of Materials Science and Engineering, Shanghai Jiao Tong University, 200240, Shanghai, China

    T. Y. Hsu (Zuyao Xu) & Xuejun Jin

Authors
  1. T. Y. Hsu (Zuyao Xu)
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  2. Xuejun Jin
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Corresponding author

Correspondence to T. Y. Hsu (Zuyao Xu) .

Editor information

Editors and Affiliations

  1. The Chinese Society for Metal, Beijing, 100711, China, People's Republic

    Yuqing Weng

  2. Advanced Steel Technology, Central Iron & Steel Research Institute, National Engineering Research Center of, No. 76 Xue Yuan Nan Lu, Beijing, 100081, China, People's Republic

    Han Dong

  3. , Central Iron & Steel Research Institute, Chinese Academy of Engineering, Beijing, 100081, China, People's Republic

    Yong Gan

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Hsu (Zuyao Xu), T.Y., Jin, X. (2011). Ultra-high Strength Steel Treated by Using Quenching–Partitioning–Tempering Process. In: Weng, Y., Dong, H., Gan, Y. (eds) Advanced Steels. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-17665-4_8

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