Abstract
The correlations of the microstructural factors with the tensile and crack tip opening displacement (CTOD) properties at −20 and −60 °C for three kinds of API linepipe steels were investigated. The C steel composed mainly of small-sized acicular ferrite exhibited excellent tensile and CTOD properties. On the other hand, the A and B steels with large-sized polygonal ferrite or granular bainite exhibited low CTOD properties at −60 °C. The effective grain size was inversely proportional to the CTOD value at low temperatures. In the A and B steels, the values of the plastic deformation area and the CTOD were low because the crack tips of the steels opened under a low maximum force due to the fracture mode of the unstable brittle crack extension behavior. In the C steel, however, the values of the plastic deformation area and the CTOD were high because the crack tip of the steel opened under a high maximum force due to the fracture mode of almost fully plastic behavior. The C steel showed the widest stretch zone and the highest CTOD value. The CTOD values and the portions of post elongation in the A and B steels decreased with decreasing test temperature.
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Kang, M., Kim, H., Lee, S. et al. Correlation of microstructure with tensile and crack tip opening displacement properties at low temperatures in API linepipe steels. Met. Mater. Int. 21, 628–638 (2015). https://doi.org/10.1007/s12540-015-4607-3
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DOI: https://doi.org/10.1007/s12540-015-4607-3