Chen T.-CHuang J.-YShiue R.-KTsay L.-W.REN-KAE SHIUE2021-08-052021-08-0520213080161https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103313936&doi=10.1016%2fj.ijpvp.2021.104382&partnerID=40&md5=eedc0d1a6c3121503f4baaf0f8f046a5https://scholars.lib.ntu.edu.tw/handle/123456789/576943The effects of heat treatments on the susceptibility to environment-induced cracking (EIC) of the CF8A stainless steel (SS) in simulated water of a boiling water reactor (BWR) were investigated by slow strain-rate tensile (SSRT) tests. Different microstructures were resulted by subjecting the as-casted CF8A to stress relief treatment (1050 °C/2 h, C sample), thermal aging (385 °C/20000 h, A sample), recovery annealing (500 °C/1 h, R sample) or solution annealing (1200 °C/2 h, S sample). The results indicated that after aging treatment (A sample), a decrease in tensile ductility and impact toughness was resulted relative to the un-aged specimens. Recovery annealing (R sample) caused an improved tensile ductility and impact toughness of the embrittled CF8A. Excessive solution (S sample) led to an obvious decrease in tensile strength but increase in ductility and toughness of the CF8A. The EIC susceptibility of the tested samples in simulated BWR water increased in the order: S < C < R < A samples. The cracks in distinct CF8A specimens were found to initiate at and propagate along δ/γ interfaces in simulated BWR water. The lowered ferrite content and change in ferrite morphology accounted for the superior EIC resistance of the S sample relative to that of the other ones in simulated BWR water. ? 2021 Elsevier LtdAnnealing; Ductility; Ferrite; Fracture toughness; Microstructure; Morphology; Strain rate; Stress relief; Tensile strength; Thermal aging; Aging treatment; Boiling water reactor (BWR); Effects of heat treatment; Ferrite morphologies; Simulated BWR waters; Slow strain rate tensile test; Solution annealing; Tensile ductility; Boiling water reactors[SDGs]SDG6journal article10.1016/j.ijpvp.2021.1043822-s2.0-85103313936