[Kovove materialy - Metallic materials]
    Sat - September 19, 2020 - 05:28 No. of hits : 1175096 ISSN 1338-4252 (online) ISSN 0023-432X (printed)
© Institute of Materials and Machine Mechanics, Slovak Academy of Sciences, Bratislava, Slovak Republic

VOLUME 42 (2004), Issue 1

Creep softening and strenghtening mechanisms due to γ' raft development in SMP 14 single crystal nickel base superalloy at 1000 °C
vol. 42 (2004), no. 1, pp. 21 - 30

The high temperature mechanical behaviour of nickel base superalloys depends mainly on the reinforcing γ' precipitate volume fraction and on its morphology that evolves significantly during deformation particularly at high temperature. In single crystal nickel base superalloys characterised by negative misfit between γ' and the γ phases, the original cuboidal γ' microstructure develops into a lamellar γ/γ' pattern perpendicular to the loading axis, when the alloys are crept at high temperature under tensile load along a <001> crystallographic direction. The typical creep curves of nickel base superalloys are characterised by three or four different creep stages. Such stages can be rationalised in terms of evolution of the reinforcing γ' phase morphology during creep. The aim of this paper is to investigate the effects of γ' morphology evolution on the long tertiary creep behaviour of the nickel base superalloy SMP 14 at 1000 °C.

Key words
creep, single crystal nickel base superalloy, microstructure

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Full title of this journal is bilingual: Kovové materiály - Metallic Materials.
The official abbreviation in accordance with JCR ISI is Kovove Mater.

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