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      Study of Pipeline Steels with Acicular Ferrite Microstructure and Ferrite-bainite Dual-phase Microstructure

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          Abstract

          Three kinds of X70 steels with the same chemical composition and different microstructures fabricated by varying processes were compared in aspect of the microstructures and mechanical properties using SEM, TEM and tensile testing machine. The experimental results showed that the steel 1 with acicular ferritic microstructure fabricated by thermal-mechanical processing with online accelerated cooling (TMCP) exhibited an excellent combination of strength and toughness, but provided high yield ratio of 0.85, low uniform elongation of 8.3% as well as low strain hardening exponent of 0.09, indicating poor deformability. In contrast to above steel 1, the steel 2 and steel 3 having ferrite-bainite dual-phase microstructure respectively fabricated by TMCP and intercritical annealing exhibited the improved deformability in terms of the low yield ratio of 0.69 and 0.68, high uniform elongation of 12.8% and 11.8%, and strain hardening exponent of 0.157 and 0.155. It is argued that the optimum properties combination of strength, toughness and deformability can best be achieved by obtaining a ferrite-bainite dual-phase microstructure. This kind of ferrite-bainite dual-phase pipeline steel is appropriate to transmitting oil and natural gas in seismic zone and permafrost.

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          Most cited references19

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          Microstructure and mechanical properties of bainitic low carbon high strength plate steels

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            Continuous cooling transformation of undeformed and deformed low carbon pipeline steels

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              Study of high strength pipeline steels with different microstructures

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                Author and article information

                Contributors
                Role: ND
                Role: ND
                Journal
                mr
                Materials Research
                Mat. Res.
                ABM, ABC, ABPol (São Carlos )
                1980-5373
                February 2015
                : 18
                : 1
                : 36-41
                Affiliations
                [1 ] Zhengzhou University China
                Article
                S1516-14392015000100036
                10.1590/1516-1439.256813
                09324327-79bf-4da0-8c78-a14bf402ba8e

                http://creativecommons.org/licenses/by/4.0/

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                Product

                SciELO Brazil

                Self URI (journal page): http://www.scielo.br/scielo.php?script=sci_serial&pid=1516-1439&lng=en
                Categories
                ENGINEERING, CHEMICAL
                MATERIALS SCIENCE, MULTIDISCIPLINARY
                METALLURGY & METALLURGICAL ENGINEERING

                General materials science,General engineering
                pipeline steel,dual-phase microstructure,ferrite,bainite,deformability

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