DETERMINATION OF TENSILE STRAIN-HARDENING EXPONENT AND STRENGTH COEFFICIENT FOR HIGH STRENGTH STEEL AT ELEVATED TEMPERATURE

Abstract

The purpose of this paper is to determine tensile strain-hardening exponent and strength coefficient of the STRENX 700 steel utilizes stress-strain data obtained in a uniaxial tension test at elevated temperature. Tensile data were obtained in continuous and rate-controlled manner via displacement control. Ramberg-Osgood relationship was used to describe the uniaxial tension behaviour of the STRENX 700 steel. The tensile strain-hardening exponent and strength coefficient at elevated temperature are determined from an empirical representation over the relation between the true-stress versus true-strain.