https://scholars.lib.ntu.edu.tw/handle/123456789/576943
標題: | Effects of heat treatments on the microstructure and environment-induced cracking of CF8A steel in simulated BWR water | 作者: | Chen T.-C Huang J.-Y Shiue R.-K Tsay L.-W. REN-KAE SHIUE |
關鍵字: | Annealing; 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 | 公開日期: | 2021 | 卷: | 191 | 來源出版物: | International Journal of Pressure Vessels and Piping | 摘要: | The 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 Ltd |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103313936&doi=10.1016%2fj.ijpvp.2021.104382&partnerID=40&md5=eedc0d1a6c3121503f4baaf0f8f046a5 https://scholars.lib.ntu.edu.tw/handle/123456789/576943 |
ISSN: | 3080161 | DOI: | 10.1016/j.ijpvp.2021.104382 |
顯示於: | 材料科學與工程學系 |
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