Microstructures and mechanical properties of twinning M/A islands in a X100 High Strength Pipeline Steel

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Important Dates

Conference:

Apr. 22-24, 2019

Full Paper Due: Mar. 18, 2019

Abstract Due: Mar. 18, 2019

Audience Registration Due:
Apr. 22, 2019

Presentations of The Spring World Congress on Engineering and Technology (SCET 2017)

● Microstructures and mechanical properties of twinning M/A islands in a X100 High Strength Pipeline Steel
Author(s)
Jiming Zhang
Affiliation(s)
State Key Laboratory for Performance and Structural Safety of Oil Industry Equipment Materials
KEYWORDS
Microstructures, mechanical properties, twinning M/A islands, X100 High Strength Pipeline Steel
ABSTRACT
Fine microstructures of twinning M/A (Martensite/austenite) islands in a X100 high strength pipeline steel were analyzed by the scanning electron microscope (SEM) and high-resolution transmission electron microscope (HRTEM), and a uniaxial compressive experiment of micro-pillar for a twinning M/A island was conducted in present paper. The experimental results showed that the M/A islands were consisted of retained austenite and nanoscale twins with a size of less than ten nanometers. The nanoscale twins showed a few small blocks in the M/A islands. The twinning M/A islands increased the strength and decreased the toughness of pipeline steel with the increase of M/A contents. The nanoscale twinning M/A island exhibited a higher deformation hardening during the micro-pillar compressive test, and its uniaxial compressive strength could up to 1.35GPa ultrahigh stress level.