Linepipe with the dual-phase steel of bainite and dispersed MA (martensite-austenite constituent) phases has been applied for many pipelines in the seismic and permafrost regions which require higher deformability of the linepipes. Bainite-MA dual-phase microstructure exhibits excellent deformability and high strength up to Grade X100. Finely dispersed MA phases in the bainitic matrix also show strong resistance to microscopic crack initiation and propagation, resulting in good toughness of the base metal. This paper introduces metallurgical features of the bainite-MA type dual-phase steel with exploring microscopic deformation and fracture behaviors.
Microstructural Aspects of Bainite-MA Type Dual-Phase Steel for the Strain-Based Design in Terms of Deformation and Fracture
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Ishikawa, Nobuyuki, Shimamura, Junji, Yasuda, Kyono, Nakamichi, Haruo, Endo, Shigeru, and Seishi Tsuyama. "Microstructural Aspects of Bainite-MA Type Dual-Phase Steel for the Strain-Based Design in Terms of Deformation and Fracture." Paper presented at the The Twenty-fourth International Ocean and Polar Engineering Conference, Busan, Korea, June 2014.
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