TEM and SANS investigation of age hardened Nimonic PE16 after cyclic loading at room temperature

Journal Article · Fri May 01 04:00:00 EDT 1992 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(92)90079-T· OSTI ID:5007618

Sundararaman, M; Chen, W; Wahi, R P; Wiedenmann, A; Wagner, W; Petry, W ^[1]

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1. Bhabha Atomic Research Centre, Bombay (India) Berlin, Technische Universitaet, (Germany) Hahn-Meitner-Institut Berlin GmbH, (Germany) Paul Scherrer Institut, Villigen (Switzerland) Institut Max von Laue - Paul Langevin, Grenoble (France)

A nickel-base superalloy Nimonic PE16 shows softening when subjected to low cycle fatigue (LCF) at room temperature. In this work, small-angle neutron scattering (SANS) and transmission electron microscopy (TEM) were used to study the morphology of gamma-prime precipitates in the Nimonic PE16 after LCF at room temperature. In TEM dark-field images using superlattice reflections, deformation bands free of gamma-prime precipitates in the Nimonic PE16 after LCF at room temperature. In TEM dark-field images using superlattice reflections, deformation bands free of gamma-prime precipitates are observed. SANS measurements allowed the characterization of the disappeared precipitates with regard to their average size, size distribution and volume fraction by comparing the scattered intensities of loaded and unloaded specimens. An analysis of the results shows that the gamma-prime precipitates within the deformation bands have completely dissolved and not just disordered or cut to sizes smaller than the TEM resolution limit. 14 refs.

• OSTI ID: 5007618
• Journal Information: Acta Metallurgica et Materialia; (United States), Journal Name: Acta Metallurgica et Materialia; (United States) Vol. 40:5; ISSN 0956-7151; ISSN AMATE
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY-NI43FE33CR16MO3
ALLOYS
ALUMINIUM ALLOYS
AMBIENT TEMPERATURE
BORON ADDITIONS
BORON ALLOYS
CHROMIUM ALLOYS
COBALT ADDITIONS
COBALT ALLOYS
COHERENT SCATTERING
COPPER ADDITIONS
COPPER ALLOYS
CORROSION RESISTANT ALLOYS
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CUBIC LATTICES
DEFORMATION
DIFFRACTION
ELECTRON MICROSCOPY
FATIGUE
FCC LATTICES
HARDENING
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
IRON ALLOYS
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
MICROSTRUCTURE
MOLYBDE
NEUTRON DIFFRACTION
NIMONIC PE16
PRECIPITATION HARDENING
SCATTERING
SMALL ANGLE SCATTERING
TRANSMISSION ELECTRON MICROSCOPY