TY - JOUR
T1 - An EBSD investigation on flow localization and microstructure evolution of 316L stainless steel for Gen IV reactor applications
AU - Wu, Xianglin
AU - Pan, Xiao
AU - Mabon, James C.
AU - Li, Meimei
AU - Stubbins, James F.
N1 - Funding Information:
The work was supported by the US Department of Energy under grant DE-FG07-02ID14337. The authors would also like to express their appreciation to Dr Peter Kurath and Rick Rottet of Advanced Materials Testing and Evaluation Laboratory of University of Illinois at Urbana-Champaign for technical assistance. The microstructural analysis work was carried out in the Center for Microanalysis of Materials, Frederick Seitz Materials Research Laboratory, University of Illinois, which is partially supported by the US Department of Energy under grant DEFG02-91-ER45439.
PY - 2007/9/15
Y1 - 2007/9/15
N2 - Type 316L stainless steel has been selected as a candidate structural material in a series of current accelerator driven systems and Generation IV reactor conceptual designs. The material is sensitive to irradiation damage in the temperature range of 150-400 °C: even low levels of irradiation exposure, as small as 0.1 dpa, can cause severe loss of ductility during tensile loading. This process, where the plastic flow becomes highly localized resulting in extremely low overall ductility, is referred as flow localization. The process controlling this confined flow is related to the difference between the yield and ultimate tensile strengths such that large irradiation-induced increases in the yield strength result in very limited plastic flow leading to necking after very small levels of uniform elongation. In this study, the microstructural evolution controlling flow localization is examined. It is found that twinning is an important deformation mechanism at lower temperatures since it promotes the strain hardening process. At higher temperatures, twinning becomes energetically impossible since the activation of twinning is determined by the critical twinning stress, which increases rapidly with temperature. Mechanical twinning and dislocation-based planar slip are competing mechanisms for plastic deformation.
AB - Type 316L stainless steel has been selected as a candidate structural material in a series of current accelerator driven systems and Generation IV reactor conceptual designs. The material is sensitive to irradiation damage in the temperature range of 150-400 °C: even low levels of irradiation exposure, as small as 0.1 dpa, can cause severe loss of ductility during tensile loading. This process, where the plastic flow becomes highly localized resulting in extremely low overall ductility, is referred as flow localization. The process controlling this confined flow is related to the difference between the yield and ultimate tensile strengths such that large irradiation-induced increases in the yield strength result in very limited plastic flow leading to necking after very small levels of uniform elongation. In this study, the microstructural evolution controlling flow localization is examined. It is found that twinning is an important deformation mechanism at lower temperatures since it promotes the strain hardening process. At higher temperatures, twinning becomes energetically impossible since the activation of twinning is determined by the critical twinning stress, which increases rapidly with temperature. Mechanical twinning and dislocation-based planar slip are competing mechanisms for plastic deformation.
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U2 - 10.1016/j.jnucmat.2007.05.028
DO - 10.1016/j.jnucmat.2007.05.028
M3 - Article
AN - SCOPUS:34547841449
SN - 0022-3115
VL - 371
SP - 90
EP - 97
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
IS - 1-3
ER -