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Effect of the type of the melt-atomized powder on the behavior of the Ni-based superalloy HIPped compact under high temperature compression tests

  • : Andrei Shulga1
  • : 1National Research Nuclear University MEPhI
  • : PDF Download
  • : 2014

Abstract

Results of compression tests of the specimens of the type EP741NP Ni-based superalloy in the temperatures range of 1050 to 1200 C and investigation of the microstructure features are presented. The specimens were cut from PM HIP compacts fabricated using the rapidly quenched powders produced by the gas atomization technique and plasma rotating electrode process (PREP). An analysis of the stress-strain curves and the features of the microstructure and distribution of boron and carbon are presented. The following main methods were used for the specimen investigation: light metallography and autoradiography on carbon and boron. Effect of the type of the melt-atomized powder on the level of the HIPped compact flow stress and the features of the microstructures such as «necklace», ultra high dispersion types were detected. Correlations of these peculiarities of the microstructure with carbon and boron distribution and the features of the stress-strain curves were established.
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