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Title: Triple ion-beam studies of radiation damage effects in a 316LN austenitic alloy for a high power spallation neutron source

Abstract

Austenitic 316LN alloy was ion-irradiated using the unique Triple Ion Beam Facility (TIF) at ORNL to investigate radiation damage effects relevant to spallation neutron sources. The TIF was used to simulate significant features of GeV proton irradiation effects in spallation neutron source target materials by producing displacement damage while simultaneously injecting helium and hydrogen at appropriately high gas/dpa ratios. Irradiations were carried out at 80, 200, and 350 C using 3.5 MeV Fe{sup ++}, 360 keV He{sup +}, and 180 keV H{sup +} to accumulate 50 dpa by Fe, 10,000 appm of He, and 50,000 appm of H. Irradiations were also carried out at 200 C in single and dual ion beam modes. The specific ion energies were chosen to maximize the damage and the gas accumulation at a depth of {approximately} 1 {micro}m. Variations in microstructure and hardness of irradiated specimens were studied using transmission electron microscopy (TEM) and a nanoindentation technique, respectively. TEM investigation yielded varying damage defect microstructures, comprising black dots, faulted and unfaulted loops, and a high number density of fine bubbles (typically less than 1 nm in diameter). With increasing temperature, faulted loops had a tendency to unfault, and bubble microstructure changed from a bimodalmore » size distribution to a unimodal distribution. Triple ion irradiations at the three temperatures resulted in similar increases in hardness of approximately a factor of two. Individually, Fe and He ions resulted in a similar magnitude of hardness increase, whereas H ions showed only a very small effect. The present study has yielded microstructural information relevant to spallation neutron source conditions and indicates that the most important concern may be radiation induced hardening and associated ductility loss.« less

Authors:
; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab., TN (United States)
Sponsoring Org.:
USDOE, Washington, DC (United States)
OSTI Identifier:
634122
Report Number(s):
CONF-970201-31
ON: DE97009367; TRN: 98:009484
DOE Contract Number:  
AC05-96OR22464
Resource Type:
Conference
Resource Relation:
Conference: 126. annual meeting of the Minerals, Metals and Materials Society, Orlando, FL (United States), 9-13 Feb 1997; Other Information: PBD: Sep 1997
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 43 PARTICLE ACCELERATORS; 07 ISOTOPE AND RADIATION SOURCE TECHNOLOGY; PHYSICAL RADIATION EFFECTS; STAINLESS STEEL-316L; NEUTRON SOURCES; TARGET CHAMBERS; BUILDING MATERIALS; IRON IONS; HELIUM IONS; HYDROGEN IONS; MICROSTRUCTURE; HARDNESS

Citation Formats

Lee, E H, Rao, G R, Hunn, J D, Rice, P M, Lewis, M B, Cook, S W, Farrell, K, and Mansur, L K. Triple ion-beam studies of radiation damage effects in a 316LN austenitic alloy for a high power spallation neutron source. United States: N. p., 1997. Web.
Lee, E H, Rao, G R, Hunn, J D, Rice, P M, Lewis, M B, Cook, S W, Farrell, K, & Mansur, L K. Triple ion-beam studies of radiation damage effects in a 316LN austenitic alloy for a high power spallation neutron source. United States.
Lee, E H, Rao, G R, Hunn, J D, Rice, P M, Lewis, M B, Cook, S W, Farrell, K, and Mansur, L K. Mon . "Triple ion-beam studies of radiation damage effects in a 316LN austenitic alloy for a high power spallation neutron source". United States. https://www.osti.gov/servlets/purl/634122.
@article{osti_634122,
title = {Triple ion-beam studies of radiation damage effects in a 316LN austenitic alloy for a high power spallation neutron source},
author = {Lee, E H and Rao, G R and Hunn, J D and Rice, P M and Lewis, M B and Cook, S W and Farrell, K and Mansur, L K},
abstractNote = {Austenitic 316LN alloy was ion-irradiated using the unique Triple Ion Beam Facility (TIF) at ORNL to investigate radiation damage effects relevant to spallation neutron sources. The TIF was used to simulate significant features of GeV proton irradiation effects in spallation neutron source target materials by producing displacement damage while simultaneously injecting helium and hydrogen at appropriately high gas/dpa ratios. Irradiations were carried out at 80, 200, and 350 C using 3.5 MeV Fe{sup ++}, 360 keV He{sup +}, and 180 keV H{sup +} to accumulate 50 dpa by Fe, 10,000 appm of He, and 50,000 appm of H. Irradiations were also carried out at 200 C in single and dual ion beam modes. The specific ion energies were chosen to maximize the damage and the gas accumulation at a depth of {approximately} 1 {micro}m. Variations in microstructure and hardness of irradiated specimens were studied using transmission electron microscopy (TEM) and a nanoindentation technique, respectively. TEM investigation yielded varying damage defect microstructures, comprising black dots, faulted and unfaulted loops, and a high number density of fine bubbles (typically less than 1 nm in diameter). With increasing temperature, faulted loops had a tendency to unfault, and bubble microstructure changed from a bimodal size distribution to a unimodal distribution. Triple ion irradiations at the three temperatures resulted in similar increases in hardness of approximately a factor of two. Individually, Fe and He ions resulted in a similar magnitude of hardness increase, whereas H ions showed only a very small effect. The present study has yielded microstructural information relevant to spallation neutron source conditions and indicates that the most important concern may be radiation induced hardening and associated ductility loss.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {9}
}

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