Seminars and Events

Integrated Computational Materials Design (ICME) of Co- and Ni-based superalloys

Date/Time: 17.09.2014. 2.30 p.m.
Place: Ruhr-Universität Bochum, Bochum, Germany

Nicholas Hatcher, QuesTek Innovations LLC, Evanston, USA

ICME within the US-MGI program has been applied to two superalloy systems: a high-strength, wear-resistant material alternative to Cu-Be for highly loaded, unlubricated aerospace bushing applications and a Ni-based single crystal (SX) superalloy for use in industrial gas turbine (IGT) blades. To avoid health-hazards associated with Be in Cu-Be, Co-based designs were developed to encourage FCC/L12 lattice parameter matching, and a final alloy design achieved desired properties with initial full scale prototypes produced. For advanced power plant technologies novel turbine blade materials were developed to exhibit the requisite creep rupture resistance. Designs address solutions to casting defects such as freckling, high/low angle boundary (HAB/LAB) formation, grain nucleation, and shrinkage/porosity. The design process included a systems approach with modelling, targeted experimental validation and characterization, and accelerated scale-up and manufacturing.

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