Phase Transformation Behaviors of Nb-V-Ti Microalloyed Pipeline Steel X70

Abstract:

The CCT (continuous cooling transformation) diagrams of the Nb-V-Ti without Mo containing microalloyed pipeline steel X70 were investigated. The microstructures observed in continuous cooled specimens are composed of P (pearlite), PF (polygonal ferrite), QF (quasi-polygonal ferrite), and GF (granular bainite ferrite). At low cooling rates between 0.1°C/s and 1°C/s, the microstructure of the steel consisted of banded ferrite and pearlite but higher cooling rates suppressed its formation.

• Periodical: Advanced Materials Research (Volumes 750-752)
• Pages: 380-384
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.750-752.380
• Online since: August 2013
• Authors: Yu Hui Wang, Ya Nan Zheng, Tian Sheng Wang, Bo Liao, Li Gang Liu*
• Keywords: CCT Diagram, Microalloyed, Microstructure, Pipeline Steel X70

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