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Behavior of the Type Ep741np Ni-based Superalloy Manufactured by Pm Hip Under High Temperature Compression Tests

  • : A. V. Shulga
  • : National Research Nuclear University MEPhI
  • : 2013, Vol 1, p. 439-444
  • : PDF Download
  • : 2013

Abstract

Compression tests of the specimens of the type EP741NP Ni-based superalloy at the tempera-tures 1100, 1125, 1150, 1175, 1200 ?C and deformation rates 10-1 and 10-3 s-1 were performed. The specimens were cut from the hot forged PM HIP compact fabricated using the rapidly quenched powder produced by plasma rotating electrode process (PREP). The results of investigation of the stress-strain curves and features of microstructure and boron distribution are presented. The following main methods were used for investigation: light metallography and track autoradiography on boron. Effect of the static and dynamic recrystallization on the features of the microstructure such as «neck-lace», ultra high dispersion and coarse grains types were detected. Correlations of these peculiarities of the microstructure with boron distribution and the features of the stress-strain curves were estab-lished.

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