Calculation of creep curves from tensile yield stress measurements on a low alloy steel

Abstract

For many applications, it may be useful to be able to estimate creep properties of a material from simpler testing procedures such as tensile tests. Most alloys used for creep service conditions are in a hardened condition and thus tertiary creep, controlled by microstructural degradation, is dominant. This paper presents some results on calculating creep curves from tensile test results from a low alloy steel. Tensile tests at different temperatures and strain rates were used to determine material parameters for use in kinetic equations describing deformation. Tests on furnace aged specimens were used to quantify softening owing to material degradation and formulate a structure evolution expression. This, together with the kinetic equation, was used to determine creep curves.