The Low Temperature Impact Behavior and Ductile-Brittle Transition of Nanocluster-Strengthened Steel

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  • Zhang Caidong
    HBIS Materials Technology Research Institute, HBIS Group
  • Zhang Yunfei
    HBIS Materials Technology Research Institute, HBIS Group
  • Sun Zhiyan
    HBIS Materials Technology Research Institute, HBIS Group
  • Ren Shuai
    HBIS Materials Technology Research Institute, HBIS Group
  • Zhao Yingli
    HBIS Materials Technology Research Institute, HBIS Group
  • Fu Lu
    Yantai Research Institute and Graduate School, Harbin Engineering University
  • Zhao Yan
    Yantai Research Institute and Graduate School, Harbin Engineering University
  • Wu Yingfei
    HBIS Materials Technology Research Institute, HBIS Group

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<p>A series of impact tests within the temperature range of −180∼20°C were applied to study the low temperature impact behavior and ductile-brittle transition of the 700 MPa nanocluster-strengthened steel. The results clearly demonstrated that temperature had a significant effect on impact properties. As the temperature decreased, the impact absorption energy and shear section ratio were correspondingly reduced, and the micro-morphology was changed gradually from ductile fracture to brittle fracture. The ductile-brittle transition temperature (DBTT) range of was between −80°C and −160°C. The fitting results of the Boltzmann function for the ductile-brittle transition curve were in good agreement with the experimental observations. Specifically, the DBTT was determined to be −110 ± 1°C, which suggested good low-temperature impact toughness. The outstanding low-temperature impact toughness of the test steel is mainly due to its low C content and high Ni content, fine effective grain size (EGS), and a large number of Cu-rich nanoscale precipitates. Furthermore, the effect of temperature on dislocation movement plays a major role in the ductile-brittle transition.</p>

収録刊行物

  • MATERIALS TRANSACTIONS

    MATERIALS TRANSACTIONS 65 (2), 152-158, 2024-02-01

    公益社団法人 日本金属学会

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