Results (
Thai) 2:
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abstract
Cross-sectional and bulk specimens of a 20% cold-worked 316 austenitic stainless steel (CW 316 SS) has
been characterized by TEM, XRD and nanoindentation to determine the microstructural evolution and
mechanical property changes of 316 SS after irradiation with 7 MeV Xe26+ ions. TEM results reveal the
presence of dislocation loops with a number density of approximately 3 1022 m3 and sizes between
3 to 10 nm due to the collapse of vacancy rich cores inside displacement cascades. Peak broadening
observed in XRD diffraction patters reveal systematic changes to lattice parameters due to irradiation.
The calculated indentation values in irradiated 316 SS were found to be much higher in comparison to
the unirradiated specimen, indicating the dose dependent effect of irradiation on hardness. The relationship
between irradiation induced microstructural evolution and the changes to the mechanical properties
of CW 316 SS are discussed in the context of fluence and irradiation temperature.
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