Metals and materials international

The Korean Institute of Metals and Materials (대한금속재료학회)
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Correlation of Microstructure with Tensile and Crack Tip Opening Displacement Properties at Low Temperatures in API Linepipe Steels

  • Kang, Minju (Center for Advanced Aerospace Materials, Pohang University of Science and Technology) ;
  • Kim, Hyunmin (School of Engineering, Brown University) ;
  • Lee, Sunghak (Center for Advanced Aerospace Materials, Pohang University of Science and Technology) ;
  • Shin, Sang Yong (School of Materials Science and Engineering, University of Ulsan)
  • Received : 2014.12.12
  • Accepted : 2015.01.12
  • Published : 2015.07.20
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Abstract

The correlations of the microstructural factors with the tensile and crack tip opening displacement (CTOD) properties at -20 and $-60^{\circ}C$ 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 $-60^{\circ}C$. 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.

Keywords

Acknowledgement

Grant : 창의산업형 소재인력양성 사업단

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