Delamination Fracture Related to Tempering in a High-Strength Low-Alloy Steel |
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Authors: | Wei Yan Wei Sha Lin Zhu Wei Wang Yi-Yin Shan Ke Yang |
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Affiliation: | (1) Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, P.R. China;(2) School of Planning Architecture & Civil Engineering, Queen’s University of Belfast, Belfast, United Kingdom; |
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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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