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Title: Microstructural Characterization of Alloy 617 Crept into the Tertiary Regime

Abstract

The microstructure of Alloy 617 was characterized following creep tests interrupted at total creep strains ranging from 2-20%. A range of creep temperatures (750-1000oC) and initial creep stresses (10-145 MPa) produced creep test durations ranging from 1 to 5800 hours. Image analysis of optical photomicrographs on longitudinal sections of the gage length was used to document the fraction of creep porosity as a function of creep parameters. Creep porosity was negligible below tertiary creep strains of 10% and increased with tertiary creep strain, thereafter. For a given temperature and total creep strain, creep porosity increased with decreasing creep stress. Creep porosity increased linearly with duration of the creep experiment. TEM performed on the gage sections did not reveal significant creep cavity formation on grain boundaries at the sub-micron level. It was concluded that the onset of tertiary creep did not result from creep cavitation and more likely arose due to the formation of low energy dislocation substructures with increasing tertiary strain.

Authors:
 [1];  [1]
  1. Idaho National Laboratory
Publication Date:
Research Org.:
Idaho National Lab. (INL), Idaho Falls, ID (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE)
OSTI Identifier:
1349439
Report Number(s):
INL/CON-14-33459
DOE Contract Number:  
AC07-05ID14517
Resource Type:
Conference
Resource Relation:
Conference: 2015 ASME Pressure Vessels & Piping Conference, Boston MA, 7/19/2015 - 7/23/2015
Country of Publication:
United States
Language:
English
Subject:
Alloy 617; creep porosity; Tertiary Creep

Citation Formats

Lillo, Thomas Martin, and Wright, Richard Neil. Microstructural Characterization of Alloy 617 Crept into the Tertiary Regime. United States: N. p., 2015. Web. doi:10.1115/PVP2015-45055.
Lillo, Thomas Martin, & Wright, Richard Neil. Microstructural Characterization of Alloy 617 Crept into the Tertiary Regime. United States. doi:10.1115/PVP2015-45055.
Lillo, Thomas Martin, and Wright, Richard Neil. Wed . "Microstructural Characterization of Alloy 617 Crept into the Tertiary Regime". United States. doi:10.1115/PVP2015-45055. https://www.osti.gov/servlets/purl/1349439.
@article{osti_1349439,
title = {Microstructural Characterization of Alloy 617 Crept into the Tertiary Regime},
author = {Lillo, Thomas Martin and Wright, Richard Neil},
abstractNote = {The microstructure of Alloy 617 was characterized following creep tests interrupted at total creep strains ranging from 2-20%. A range of creep temperatures (750-1000oC) and initial creep stresses (10-145 MPa) produced creep test durations ranging from 1 to 5800 hours. Image analysis of optical photomicrographs on longitudinal sections of the gage length was used to document the fraction of creep porosity as a function of creep parameters. Creep porosity was negligible below tertiary creep strains of 10% and increased with tertiary creep strain, thereafter. For a given temperature and total creep strain, creep porosity increased with decreasing creep stress. Creep porosity increased linearly with duration of the creep experiment. TEM performed on the gage sections did not reveal significant creep cavity formation on grain boundaries at the sub-micron level. It was concluded that the onset of tertiary creep did not result from creep cavitation and more likely arose due to the formation of low energy dislocation substructures with increasing tertiary strain.},
doi = {10.1115/PVP2015-45055},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2015},
month = {7}
}

Conference:
Other availability
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