Correlation of Microstructure with Tensile and Crack Tip Opening Displacement Properties at Low Temperatures in API Linepipe Steels
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- Title
- Correlation of Microstructure with Tensile and Crack Tip Opening Displacement Properties at Low Temperatures in API Linepipe Steels
- Authors
- Kang, M; Kim, H; Lee, S; Shin, SY
- Date Issued
- 2015-07
- Publisher
- KOREAN INST METALS MATERIALS
- Abstract
- The correlations of the microstructural factors with the tensile and crack tip opening displacement (CTOD) properties at -20 and -60 degrees 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 degrees 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.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/35280
- DOI
- 10.1007/S12540-015-4607-3
- ISSN
- 1598-9623
- Article Type
- Article
- Citation
- METALS AND MATERIALS INTERNATIONAL, vol. 21, no. 4, page. 628 - 638, 2015-07
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