We analyze the mechanical properties of steels of casing pipes of different strength classes and reveal an abnormally lower brittle-fracture resistance of a steel of lower strength with specific ferrite-pearlite structure characterized by the presence of large pearlite grains with narrow ferrite borders around them. The basic mechanical properties of steels are analyzed by using a special approach based on the analysis of true tensile stress-strain diagrams. It is shown that the true plasticity of a brittler steel is more than twice lower (in the stage of necking) than for the less brittle steel. Moreover, this factor is assumed to be responsible for the low brittle-fracture resistance. Steel with a lower strength and coarse-grained structure also has a very low resistance to hydrogen cracking and is characterized by an atypical combination of a nonlinear loading diagram in the tests for crack-growth resistance with a macroscopically brittle character of fracture.
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Translated from Fizyko-Khimichna Mekhanika Materialiv, Vol. 56, No. 6, pp. 24–29, November–December, 2020.
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Zvirko, О.І., Tsyrulnyk, O.Т., Dzioba, I. et al. Influence of the Structural Features of Steels of Casing Pipes on their Mechanical Properties and Hydrogen Brittleness. Mater Sci 56, 748–754 (2021). https://doi.org/10.1007/s11003-021-00491-9
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DOI: https://doi.org/10.1007/s11003-021-00491-9