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Persistent URL http://purl.org/net/epubs/work/54205
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Record Id 54205
Title A neutron-diffraction study of the low-cycle fatigue behaviour of an austenitic stainless steel 316
Abstract Type 316 stainless steel considered to be one of the leading candidate materials for the first wall and blanket structure of future fusion reactors because of its well-characterized properties such as high temperature strength, good compatibility with coolant and irradiation properties for fast breeder reactors. The present work describes the behavior of this steel under low cycle fatigue at different temperatures. The in situ neutron diffraction fatigue test was conducted on the ENGIN-X diffractometer at the ISIS spallation neutron source in Chilton, UK. The fatigue tests were performed at room temperature and at 550○C, where the minimum strain and the maximum strains were -1.1% and 1.1%, respectively. Diffraction spectra were acquired at a series of load levels within selected fatigue cycles, enabling measurement of lattice strain parallel and perpendicular to the loading axis.The measurements were used to quantify the evolution of internal microstrain within crystallites as a function of applied macrostress through the fatigue cycles. The measurement has shown that during low cycle fatigue, grain families show different responses to applied stress, i.e. anisotropic behavior is observed. Some grain groups undergo elastic cycling whereas others exhibit plastic deformation characterized by a significant hysteresis fatigue loop. The cyclic hardening and softening behavior during fatigue are discussed and comparison is made between the experimental results and finite element crystal plasticity modelling.
Organisation ISIS , ISIS-ENGIN-X , STFC
Keywords Engineering , neutron diffraction , strain measurement , low cycle fatigue
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Language English (EN)
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Presentation Presented at 12th European Powder Diffraction Conference, Darmstadt, Germany, 27-30 Aug 2010. 2010