Correction of flow stress and determination of constitutive constants for hot working of API X100 pipeline steel. (August 2015)

• Record Type: Journal Article
• Authors: Qian, Ling-Yun; Fang, Gang; Zeng, Pan; Wang, Li-Xiao
• Is Part Of: International journal of pressure vessels and piping. Volume 132/133(2015)
• Page Start: 43
• Page End: 51
• Publication Date: 2015-08
• Subjects: X100 pipeline steel -- Hot working -- Constitutive constant -- Stress correction -- Flow stress; Pressure vessels -- Periodicals; Pipe -- Periodicals; Récipients sous pression -- Périodiques; Tuyaux -- Périodiques; Pipe; Pressure vessels; Periodicals; 681.76041
• DOI: 10.1016/j.ijpvp.2015.05.008
• Languages: English
• ISSNs: 0308-0161

Abstract

Abstract: Uniaxial compression tests of X100 pipeline steel were conducted to investigate its hot working behavior. Cylindrical specimens were compressed over a wide strain rate range of 0.001–50 s −1 and a temperature range of 850–1100 °C. Due to the heat generated from deformation and friction, the measured temperatures of compressed specimens at higher strain rates (≥1 s −1 ) deviated from the preset temperatures. Therefore, their measured stresses were corrected to obtain the true stresses at the pre-set temperatures before they were used for calculating constitutive equations. The Arrhenius-type constitutive equation was selected to describe the hot working behavior on the basis of corrected stresses. Strain-dependent constitutive constants were determined. The constitutive equation and corrected stress-strain data were both verified by using the results of additional tests at a strain rate of 20 s −1 . Highlights: The flow stresses of pipeline steel X100 at high temperatures were measured. The measured flow stresses were corrected considering the generated deformation heat. The strain-depended constitutive constants were determined to study strain effect. The developed equations were verified by new measured peak stresses.