Anisotropic Yielding Behaviour of Inconel 718 Alloy at Elevated Temperatures

Abstract

Abstract The study of anisotropic deformation behavior of material plays a key role in optimizing the hot working process parameters. Further, trustworthiness of Finite Element (FE) analysis in hot working condition is highly dependent on accurate input of mechanical properties and anisotropic yield parameters. In present work, two different anisotropic yield criteria, namely; Hill 1948 and Barlat 1989 are developed from Room Temperature (RT) to 500 °C and different slow strain rate conditions (0.01, 0.001 and 0.0001 s−1) for Inconel 718 alloy. First, uniaxial tensile test carried out from RT to 500 °C with an interval of 100°C and at quasi-static strain rate conditions at different orientation of a sheet (0°, 45° and 90°). Based on the tensile test data, extended Von-Mises isotropic criterion i.e. Hill 1948 and Barlat 1989 yield criterion were developed at different conditions. The predictability of yield criteria has been verified using yield loci, variation of anisotropic coefficient and yield stresses. The various static parameters such as correlation coefficient, relative error and standard deviation are considered to compare the yield criteria. Based on the comparison, Barlat 1989 yield criterion shows good in agreement with experimental data.