skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Overview of Alloy 617 Notched Specimen Testing

Abstract

Prior to use in high temperature nuclear applications, Alloy 617, which is currently undergoing approval for inclusion in codes and regulations related to high temperature construction, must be approved by the Nuclear Regulatory Commission. Several concerns relating to the effects of geometric discontinuities, such as notches, and multi-axial stress states (as opposed to uniaxial stress states typically present in laboratory run creep tests) must first be addressed. This work has shown that at short time intervals (1000-2500 hours), 617 is notch strengthening and will fail preferentially at locations away from the notch, provided that diameters are similar (resulting in similar stresses). Additionally, specimens designed with semi-circular notches (or U-notches, as they are referred to in this report) to impose multi-axial stress states on the specimen during creep testing were found to either maintain similar creep rupture lives as uniaxial stress specimens tested at similar conditions, or have creep rupture lives that were significantly longer. This work, while not fully completed, shows that notches and multi-axial stress states do not appear to raise concerns with relation to the use of design rules created for Alloy 617 using smooth, straight gauge test specimens and uniaxial creep tests.

Authors:
ORCiD logo [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:
1484717
Report Number(s):
INL/EXT-17-43070-Rev000
DOE Contract Number:  
AC07-05ID14517
Resource Type:
S&T Accomplishment Report
Country of Publication:
United States
Language:
English
Subject:
11 - NUCLEAR FUEL CYCLE AND FUEL MATERIALS; scanning electron microscope; Electron backscatter diffraction

Citation Formats

McMurtrey, Michael. Overview of Alloy 617 Notched Specimen Testing. United States: N. p., 2017. Web. doi:10.2172/1484717.
McMurtrey, Michael. Overview of Alloy 617 Notched Specimen Testing. United States. doi:10.2172/1484717.
McMurtrey, Michael. Fri . "Overview of Alloy 617 Notched Specimen Testing". United States. doi:10.2172/1484717. https://www.osti.gov/servlets/purl/1484717.
@article{osti_1484717,
title = {Overview of Alloy 617 Notched Specimen Testing},
author = {McMurtrey, Michael},
abstractNote = {Prior to use in high temperature nuclear applications, Alloy 617, which is currently undergoing approval for inclusion in codes and regulations related to high temperature construction, must be approved by the Nuclear Regulatory Commission. Several concerns relating to the effects of geometric discontinuities, such as notches, and multi-axial stress states (as opposed to uniaxial stress states typically present in laboratory run creep tests) must first be addressed. This work has shown that at short time intervals (1000-2500 hours), 617 is notch strengthening and will fail preferentially at locations away from the notch, provided that diameters are similar (resulting in similar stresses). Additionally, specimens designed with semi-circular notches (or U-notches, as they are referred to in this report) to impose multi-axial stress states on the specimen during creep testing were found to either maintain similar creep rupture lives as uniaxial stress specimens tested at similar conditions, or have creep rupture lives that were significantly longer. This work, while not fully completed, shows that notches and multi-axial stress states do not appear to raise concerns with relation to the use of design rules created for Alloy 617 using smooth, straight gauge test specimens and uniaxial creep tests.},
doi = {10.2172/1484717},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2017},
month = {8}
}