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Research Article

Effect of nanosized NbC precipitates on hydrogen induced cracking of high-strength low-alloy steel

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  • Received: 27 November 2019Revised: 7 August 2020Accepted: 10 August 2020Available online: 14 August 2020
  • The effect of nanosized NbC precipitates on hydrogen induced cracking (HIC) of high-strength low-alloy steel was investigated using slow strain rate tensile (SSRT) test with a continuous hydrogen charging and fracture analysis. The results showed that the HIC resistance of the Nb-bearing steel is obviously superior to that of the Nb-free steel, and the fractured Nb-bearing steel in SSRT test shows the less reduction ratio of plasticity (Iδ), but as the hydrogen traps induced by NbC precipitates approach hydrogen saturation, the effect of precipitates on HIC resistance shows an attenuating trend. The highly dispersed nanosized NbC precipitates were speculated to act as irreversible hydrogen traps, and hinder the accumulation of hydrogen at the potential crack nucleation site. In addition, as same as the Nb-free steel, the Nb-bearing steel presents both H-solution strengthening and HIC.
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Effect of nanosized NbC precipitates on hydrogen induced cracking of high-strength low-alloy steel

  • Corresponding author:

    Yun-hua Huang    E-mail: huangyh@mater.ustb.edu.cn

  • 1. Institution for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China
  • 2. Key Laboratory of Advanced Materials (MOE), School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
  • 3. Ningbo Institute of Material Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, Zhejiang, China

Abstract: The effect of nanosized NbC precipitates on hydrogen induced cracking (HIC) of high-strength low-alloy steel was investigated using slow strain rate tensile (SSRT) test with a continuous hydrogen charging and fracture analysis. The results showed that the HIC resistance of the Nb-bearing steel is obviously superior to that of the Nb-free steel, and the fractured Nb-bearing steel in SSRT test shows the less reduction ratio of plasticity (Iδ), but as the hydrogen traps induced by NbC precipitates approach hydrogen saturation, the effect of precipitates on HIC resistance shows an attenuating trend. The highly dispersed nanosized NbC precipitates were speculated to act as irreversible hydrogen traps, and hinder the accumulation of hydrogen at the potential crack nucleation site. In addition, as same as the Nb-free steel, the Nb-bearing steel presents both H-solution strengthening and HIC.

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