Influence of Volume Fraction of Bainite on Mechanical Properties of X80 Pipeline Steel with Excellent Deformability

Xiao Yong Zhang; Hui Lin Gao; Xue Qin Zhang; Yan Yang

doi:10.4028/www.scientific.net/MSF.695.271

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HomeMaterials Science ForumMaterials Science Forum Vol. 695Influence of Volume Fraction of Bainite on...

Influence of Volume Fraction of Bainite on Mechanical Properties of X80 Pipeline Steel with Excellent Deformability

Abstract:

The pipeline steel with excellent deformability with ferrite and bainite dual-phase microstructure are obtained by inter-critically accelerating cooling method, aiming to get good deformation capability of avoiding failure from the geological disasters such as landslides and earthquake. The influence of volume fraction of bainite on the mechanical properties of dual-phase pipeline steels was investigated by means of microscopic analysis method and mechanical properties testing. The results indicated that both yield strength and ultimate tensile strength of the steels increase almost linearly with the increasing volume fraction of bainite, while ductility, work hardening exponent and impact absorption energy decrease. When the volume fraction of bainite is about 50%, the yield strength, the yield strength/tensile strength ratio (Y/T), work hardening exponent, uniform elongation and impact absorption energy of X80 pipeline steels with excellent deformability is 665MPa, 0.8, 0.12, 8% and 245J respectively.

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Periodical:

Materials Science Forum (Volume 695)

Pages:

271-274

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.695.271

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Online since:

July 2011

Authors:

Xiao Yong Zhang, Hui Lin Gao, Xue Qin Zhang, Yan Yang

Keywords:

Bainite, Mechanical Property, Pipeline Steel with Excellent Deformability, Volume Fraction

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