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Effect of Nanoscale Cu-Riched Clusters on Strength and Impact Toughness in a Tempered Cu-Bearing HSLA Steel

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The effect of Cu-riched clusters on strength and impact toughness in a tempered Cu-bearing high-strength low-alloy (HSLA) steel is investigated. With increasing the tempering temperature, it is found that the yield strength increases firstly, achieving the maximum value (~ 1053 MPa) at the tempering temperature of 450 °C, and then decreases significantly with the rise of tempering temperature. The tempering temperature-dependent yield strength is closely related to the precipitation of Cu-riched clusters. When tempering at 450 °C, the peak strength will be reached as the nanoscale Cu-riched clusters with small size and high number density will cause a strong precipitation strengthening (~ 492 MPa) due to the dislocation shearing mechanism. However, the Cu-riched clusters will coarsen with further increasing tempering temperature, resulting in obvious decrement of yield strength owing to the dislocation bypassing mechanism. Compared with the yield strength, the variation in impact energy displays an inverse tendency and the impact energy is only 7 J for the sample tempered at 450 °C. The fracture mode can be well explained by the competition between the cleavage fracture strength (σF) and “yield strength” (σY). Although transgranular cleavage fracture can be found in samples tempered at 450 and 550 °C, the crack propagation along the lath boundaries is prevented in the sample tempered at 550 °C. The reason is that the number density of Cu-riched clusters at lath boundaries decreases and the segregation of Mo element at the lath boundaries is induced, which will increase the bonding energy.

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Acknowledgements

This work was financially supported by the National Key Research and Development Program of China (No. 2016YFB0300601), the Liaoning Revitalization Talents Program (No. XLYC1907143), the Strategic Priority Research Program of the Chinese Academy of Sciences (No. XDC04000000) and the Liaoning Natural Science Foundation (No. 2020-MS-008).

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Authors and Affiliations

  1. CAS Key Laboratory of Nuclear Materials and Safety Assessment, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Yubin Du, Xiaofeng Hu, Yuanyuan Song, Yangpeng Zhang & Lijian Rong

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Yubin Du

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  1. Yubin Du
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  2. Xiaofeng Hu
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  3. Yuanyuan Song
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  4. Yangpeng Zhang
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  5. Lijian Rong
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Correspondence to Xiaofeng Hu or Lijian Rong.

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Du, Y., Hu, X., Song, Y. et al. Effect of Nanoscale Cu-Riched Clusters on Strength and Impact Toughness in a Tempered Cu-Bearing HSLA Steel. Acta Metall. Sin. (Engl. Lett.) 35, 537–550 (2022). https://doi.org/10.1007/s40195-021-01277-3

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  • DOI: https://doi.org/10.1007/s40195-021-01277-3

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