Superplastic Roll Forming of Axial Symmetric Articles from Superalloys
A new method of microstructure design in axisymmetric gas turbine engine components made of superalloys is proposed. The method is based on obtaining three types of microstructures by means of superplastic roll forming: coarse-grained one with coherent nano-sized precipitates of the phase, the second with ultrafine grains of both phases and the third combining coarse deformed matrix grains surrounded by thin layers of fine matrix grains and coarsened precipitates of phase.
F. Z. Utyashev et al., "Superplastic Roll Forming of Axial Symmetric Articles from Superalloys", Advanced Materials Research, Vol. 278, pp. 301-305, 2011