Strength and Plasticity

The Physics of Metals and Metallography

, Volume 109, Issue 3, pp 278-285

First online:

Deformation and fracture of single crystals of VKNA-type alloys at 1100–1250°C

  • D. P. RodionovAffiliated withInstitute of Metal Physics, Ural Division, Russian Academy of Sciences
  • , D. I. DavydovAffiliated withInstitute of Metal Physics, Ural Division, Russian Academy of Sciences
  • , N. N. StepanovaAffiliated withInstitute of Metal Physics, Ural Division, Russian Academy of Sciences
  • , V. G. PushinAffiliated withInstitute of Metal Physics, Ural Division, Russian Academy of Sciences
  • , Yu. I. FilippovAffiliated withInstitute of Metal Physics, Ural Division, Russian Academy of Sciences
  • , N. I. VinogradovAffiliated withInstitute of Metal Physics, Ural Division, Russian Academy of Sciences
  • , Yu. N. AkshentsevAffiliated withInstitute of Metal Physics, Ural Division, Russian Academy of Sciences
  • , V. A. SazonovaAffiliated withInstitute of Metal Physics, Ural Division, Russian Academy of Sciences

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Abstract

A comparative study of the structure and mechanical properties of single-crystal samples 〈001〉 of VKNA-1V and VKNA-4U alloys (cast and after heat treatment) has been performed using tensile tests in a temperature range of 1100–1250°C. In the case of the VKNA-4U alloy, samples of different crystallographic orientations have also been tested. At 1100°C, recrystallization was observed near the zone of fracture. The basic mechanism of relaxation at 1200–1250°C was found to be dynamic recovery. At 1250°C, the strength properties of the VKNA-4U alloy are higher than those of the VKNA-1V alloy.

Key words

superalloy single crystals mechanical tests structure