Seminars and Events

Recent progress in the microstructural understanding of high temperature and low stress creep of single crystal Ni-base superalloys

Date/Time: 15.09.2014. 1:45 p.m.
Place: Ruhr-Universität Bochum, Bochum, Germany

Gunther Eggeler, Ruhr-Universität Bochum, Bochum

Single crystal Ni-base superalloys (SX) have a microstructure which consists of ordered cuboidal γ' particles (L12 phase, 70 vol.%, cube edge length: 0.5 micrometer) which are separated by thin γ channels (fcc, 30 vol. %, channel width: 0.1 micrometer). The response of SX to constant stress tensile loading is a creep rate, which strongly depends on microstructure. During creep the microstructure evolves. Particles coarsen and the subtle details of dislocation plasticity govern deformation behavior. A brief introduction into the elementary mechanisms of high temperature plasticity is given. Recent progress in the microstructural understanding is presented, addressing the high temperature and low stress creep anisotropy and the interaction between plasticity and rafting. Areas in need of further work are pointed out.

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