[2H01-04] Reactor Pressure Vessel

[2H04] FY2018 Investigation for Improvement of Evaluation Method of Irradiation Effects on Reactor Pressure Vessel and Core Internals

(4)Correlation between microstructural changes and yield strength of test reactor irradiated austenitic stainless steels

*Yuichi Miyahara¹, Kenji Nishida¹, Siwei Chen¹ (1. CRIEPI)

Keywords:Austenitic stainless steels, Test reactor irradiation, Atom probe tomography, Transmission electron microscopy, Yield strength

Atom probe and TEM observation were performed on austenitic stainless steels irradiated in a fast reactor and thermal reactor.
It was confirmed that the increment of yield strength can be estimated from microstructure by using the Orowan mechanism. The strength factor of solute enriched clusters was estimated to be about 0.09.