TITLE:
Measurements of the Thermophysical Properties of the API 5L X80
AUTHORS:
Tiago de Sousa Antonino, Pablo Batista Guimarães, Roberto de Araújo Alécio, Yogendra Prasad Yadava, Ricardo Artur Sanguinetti Ferreira
KEYWORDS:
Thermophysical Properties, API 5L X80 Steel, Measurements
JOURNAL NAME:
Materials Sciences and Applications,
Vol.5 No.8,
June
30,
2014
ABSTRACT: The thermophysical properties of API 5L X80 steel were experimentally
measured, in order to use these in computational models to determine the
temperature field in welded joints. In this work, values of thermal expansion
coefficient, specific heat, thermal diffusivity and thermal conductivity were
experimentally obtained as a function of temperature. The thermal expansion
coefficient was determined at temperatures of 20°C to 1200°C in a dilatometer
DIL 402 PC. The specific heat was determined on a differential scanning
calorimeter at temperatures between 300°C and 1200°C. The diffusivity and
thermal conductivity were determined in the temperature range 100°C to 800°C in
a 457 LFA diffusivimeter using laser flash technique. The thermal expansion
coefficient remained approximately with constant value of 8.5 × 10-6 K-1 and suffered two falls reaching values -25 × 10-6 K-1 and -50 × 10-6 K-1 in the stages of heating and cooling
respectively. It was observed for this material, minimum and maximum values of
specific heat equal to 0.571 J/gK and 1.084 J/gK at temperatures of 300°C and
720°C, respectively. The behavior of thermal diffusivity and thermal
conductivity in the temperature range 100°C to 800°C tends to decrease with
increasing temperature. Based on the measured properties, computational
modeling of the temperature field can be numerically obtained with better
accuracy.