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Research Article

Effect of in-situ nanoparticles on the mechanical properties and hydrogen embrittlement of high-strength steel

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  • Received: 20 May 2020Revised: 1 August 2020Accepted: 3 August 2020Available online: 4 August 2020
  • The critical influence of in-situ nanoparticles on the mechanical properties and hydrogen embrittlement (HE) of high-strength steel is investigated in this study. The mechanical strength and elongation of the quenched and tempered steel (919 MPa yield strength, 17.11% elongation) are higher than those of the hot-rolled steel (690 MPa yield strength, 16.81% elongation) due to the strengthening effect of Ti3O5–Nb(C,N) in-situ nanoparticles. The HE susceptibility is substantially mitigated to 55.52%, which is approximately 30% lower than that of steels without in-situ nanoparticles (84.04%) and is attributed to the heterogeneous nucleation of Ti3O5 nanoparticles increasing the density of carbides. Meanwhile, compared with hard TiN inclusions, the spherical and soft Al2O3–MnS core–shell inclusions that nucleate on the in-situ Al2O3 particles could also suppress HE. The in-situ nanoparticles generated by trace-element regional supply have strong potential in the development of high-strength and hydrogen-resistant steels.
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Effect of in-situ nanoparticles on the mechanical properties and hydrogen embrittlement of high-strength steel

  • Corresponding authors:

    Li-jie Qiao    E-mail: lqiao@ustb.edu.cn

    Xiao-lu Pang    E-mail: pangxl@mater.ustb.edu.cn

  • 1. Beijing Advanced Innovation Center for Materials Genome Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • 2. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
  • 3. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China

Abstract: The critical influence of in-situ nanoparticles on the mechanical properties and hydrogen embrittlement (HE) of high-strength steel is investigated in this study. The mechanical strength and elongation of the quenched and tempered steel (919 MPa yield strength, 17.11% elongation) are higher than those of the hot-rolled steel (690 MPa yield strength, 16.81% elongation) due to the strengthening effect of Ti3O5–Nb(C,N) in-situ nanoparticles. The HE susceptibility is substantially mitigated to 55.52%, which is approximately 30% lower than that of steels without in-situ nanoparticles (84.04%) and is attributed to the heterogeneous nucleation of Ti3O5 nanoparticles increasing the density of carbides. Meanwhile, compared with hard TiN inclusions, the spherical and soft Al2O3–MnS core–shell inclusions that nucleate on the in-situ Al2O3 particles could also suppress HE. The in-situ nanoparticles generated by trace-element regional supply have strong potential in the development of high-strength and hydrogen-resistant steels.

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