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Title: Microstructural Aspects of Irradiation Damage in A508 Gr 4N Forging Steel: Composition and Flux Effects

Abstract

Neutron irradiation can promote significant changes in the microstructure and associated mechanical properties of low alloy steels. In particular, irradiation can induce the formation of non-equilibrium phases and segregation, which may lead to a degradation in toughness. In this study, the microstructural changes caused by neutron irradiation have been characterized in A508 Grade (Gr) 4N-type steels ({approx}3.5% Ni) using a variety of state-of-the-art analytical techniques including 3D-Atom Probe Field-Ion Microscopy and Small Angle Neutron Scattering, along with post-irradiation annealing studies combining Positron Annihilation Lineshape Analysis and hardness measurements. Important differences between conventional and ''superclean'' A508 Gr 4N steel have been identified in this investigation. The data indicate that Ni is not the controlling factor in the irradiation damage behavior of these materials; rather, the Mn content of the steel is a dominant factor in the irradiation-induced microstructural development of solute-related hardening features.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Bettis Atomic Power Lab., West Mifflin, PA (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
835565
Report Number(s):
B-T-3445b
TRN: US200503%%121
DOE Contract Number:  
AC11-98PN38206
Resource Type:
Conference
Resource Relation:
Conference: Proceedings of the ASTM Symposium on the Effects of Radiation on Materials, Tucson, AZ (US), 06/20/2002; Other Information: PBD: 9 Oct 2002
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANNEALING; ANNIHILATION; FORGING; HARDENING; HARDNESS; IRRADIATION; LOW ALLOY STEELS; MECHANICAL PROPERTIES; MICROSCOPY; MICROSTRUCTURE; NEUTRONS; POSITRONS; PROBES; RADIATIONS; SCATTERING; SEGREGATION; STEELS

Citation Formats

M.G. Burke, R.J. Stofanak, J.M. Hyde, C.A. English, and W.L. Server. Microstructural Aspects of Irradiation Damage in A508 Gr 4N Forging Steel: Composition and Flux Effects. United States: N. p., 2002. Web.
M.G. Burke, R.J. Stofanak, J.M. Hyde, C.A. English, & W.L. Server. Microstructural Aspects of Irradiation Damage in A508 Gr 4N Forging Steel: Composition and Flux Effects. United States.
M.G. Burke, R.J. Stofanak, J.M. Hyde, C.A. English, and W.L. Server. Wed . "Microstructural Aspects of Irradiation Damage in A508 Gr 4N Forging Steel: Composition and Flux Effects". United States. https://www.osti.gov/servlets/purl/835565.
@article{osti_835565,
title = {Microstructural Aspects of Irradiation Damage in A508 Gr 4N Forging Steel: Composition and Flux Effects},
author = {M.G. Burke and R.J. Stofanak and J.M. Hyde and C.A. English and W.L. Server},
abstractNote = {Neutron irradiation can promote significant changes in the microstructure and associated mechanical properties of low alloy steels. In particular, irradiation can induce the formation of non-equilibrium phases and segregation, which may lead to a degradation in toughness. In this study, the microstructural changes caused by neutron irradiation have been characterized in A508 Grade (Gr) 4N-type steels ({approx}3.5% Ni) using a variety of state-of-the-art analytical techniques including 3D-Atom Probe Field-Ion Microscopy and Small Angle Neutron Scattering, along with post-irradiation annealing studies combining Positron Annihilation Lineshape Analysis and hardness measurements. Important differences between conventional and ''superclean'' A508 Gr 4N steel have been identified in this investigation. The data indicate that Ni is not the controlling factor in the irradiation damage behavior of these materials; rather, the Mn content of the steel is a dominant factor in the irradiation-induced microstructural development of solute-related hardening features.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2002},
month = {10}
}

Conference:
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