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Delamination Fracture Related to Tempering in a High-Strength Low-Alloy Steel

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Abstract

The delamination or splitting of mechanical test specimens of rolled steel plate is a phenomenon that has been studied for many years. In the present study, splitting during fracture of tensile and Charpy V-notch (CVN) test specimens is examined in a high-strength low-alloy plate steel. It is shown that delamination did not occur in test specimens from plate in the as-rolled condition, but was severe in material tempered in the temperature range 500 °C to 650 °C. Minor splitting was seen after heating to 200 °C, 400 °C, and 700 °C. Samples that had been triple quenched and tempered to produce a fine equiaxed grain size also did not exhibit splitting. Microstructural and preferred orientation studies are presented and are discussed as they relate to the splitting phenomenon. It is concluded that the elongated as-rolled grains and grain boundary embrittlement resulting from precipitates (carbides and nitrides) formed during reheating were responsible for the delamination.

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Acknowledgments

The work is financially supported by the Doctoral Research Fund from Liaoning Province (People’s Republic of China) through Grant No. 20081011. Thanks are also due to Dr. William Warke for his efforts on this article.

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Authors and Affiliations

  1. Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China

    Wei Yan (Research Associate), Lin Zhu (Doctoral Student), Wei Wang (Doctoral Student), Yi-Yin Shan (Professor) & Ke Yang (Professor)

  2. School of Planning Architecture & Civil Engineering, Queen’s University of Belfast, Belfast, United Kingdom

    Wei Sha (Professor)

Authors
  1. Wei Yan
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  2. Wei Sha
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  3. Lin Zhu
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  4. Wei Wang
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  5. Yi-Yin Shan
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  6. Ke Yang
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Correspondence to Yi-Yin Shan.

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Manuscript submitted March 17, 2009.

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Yan, W., Sha, W., Zhu, L. et al. Delamination Fracture Related to Tempering in a High-Strength Low-Alloy Steel. Metall Mater Trans A 41, 159–171 (2010). https://doi.org/10.1007/s11661-009-0068-y

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