Static Recrystallization Kinetics Model of X70 Pipeline Steel

• Published in: Applied Mechanics and Materials Vol. 290; no. Spacecraft Structures, Materials and Mechanical Testing; pp. 3 - 8
• Main Authors: Tang, Di, Wang, Lei, Xu, Yao Wen, Song, Yong
• Format: Journal Article
• Language: English
• Published: Zurich Trans Tech Publications Ltd 01.02.2013
• Subjects: High strength low alloy steels; Inclination; Mathematical models; Pipelines; Recrystallization; Softening; Steels; Strain rate; Static Recrystallization; Hot Compression; X70 Pipeline Steel; Mathematical Models
• ISBN: 9783037856338; 3037856335
• ISSN: 1660-9336; 1662-7482; 1662-7482
• DOI: 10.4028/www.scientific.net/AMM.290.3

The main purpose of this study is to develop a numerical model to describe the static recrystallization kinetics in X70 pipeline steel. In order to investigate the static softening behavior, double-hit compression tests were performed on a Gleeble-3500 thermomechanical simulator over a temperature range of 950-1150°C. The interpass time varies from 1-500s. Different values were applied to estimate effects of strain rate and deformation on static recrystallization. The results show that factors such as high temperature, long holding time and lower strain rate will lead to the inclination of softening behavior. The static softening activation energy was obtained. The good agreement between the predicted values and experimental results indicated the validation of the developed model of this study.