Microstructure and Mechanical Properties of Twinning M/A Islands in a X100 High Strength Pipeline Steel

Abstract:

Fine microstructure of twinning Martensite/austenite (M/A) 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 M/A islands in X100 pipeline steels were consisted of retained austenite and nanoscale twins with sizes of less than ten nanometers. There were a few small blocks of nanoscale twins in an M/A island. Volume fraction of twinning M/A islands had an important effect on mechanical properties of X100 pipeline steels, with the increase of twinning M/A islands fraction, yield strength of X100 pipeline steel increased, and impact toughness of X100 pipeline steel decreased. The micro-pillar compression showed that the nanoscale twinning M/A island exhibited the higher deformation hardening during the compressive test, and its uniaxial compressive strength could up to 1.35GPa ultrahigh stress level.

• Periodical: Materials Science Forum (Volume 896)
• Pages: 182-189
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.896.182
• Online since: March 2017
• Authors: Ji Ming Zhang*, Qiang Chi, Ling Kang Ji, Hui Feng, Yan Hua Li, Li Hua Qi, Hon Eg Yuan Chen, Wei Wei Zhang
• Keywords: Twinning, Deformation Hardening, M/A Island, Micro-Pillar, Pipeline Steel

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