ICAMS / Interdisciplinary Centre for Advanced Materials Simulation


Crystal plasticity modeling of porosity reduction in an as-cast Ni-base single crystal superalloy during hot isostatic pressing

Date: 12.05.2015
Place: 12th International Conference on the Mechanical Behavior of Materials, Karlsruhe, Germany

Anxin Ma
Siwen Gao
Inmaculada Lopez-Galilea, Ruhr-Universität Bochum, Bochum, Germany
Stephan Huth, Ruhr-Universität Bochum, Bochum, Germany
Werner Theisen, Ruhr-Universität Bochum, Bochum, Germany
Alexander Hartmaier

Owing to the excellent performance of Ni-base single crystal superalloys to resist extreme working conditions at high temperature, they are the material of choice for application in the hottest regions of modern gas turbine. Although the deformation resistence at the elevated temperature significantly increases by adding a high concentration of refractory elements, a stronger dendritic segregation during solidification and pores accumulation in the interdendritic region during an extensive homogenization heat treatment tend to occur, which deteriorates mechanical properties of materials (Link, T. 2006). In order to heal these micropores, hot isostatic pressing (HIP) as an advanced thermal treatment is utilized, which combines creep deformation and diffusion bonding to homogenize the alloy composition by the appropriate pressure and high temperatures (Kim, M.T. 2006).

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