Microstructural stability of 11Cr ODS steel

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• 作者：Tetsuya Yamashiro^a ; ^{fgsjkr@eng.hokudai.ac.jp" class="auth_mail" title="E-mail the corresponding author} ; Shigeharu Ukai^b ; Naoko Oono^b ; Satoshi Ohtsuka^c ; Takeji Kaito^c
• 关键词：Continuous cooling transformation diagram ; ODS ; Residual ferrite ; α-γ phase transformation ; Pinning force
• 刊名：Journal of Nuclear Materials
• 出版年：2016
• 出版时间：15 April 2016
• 年：2016
• 卷：472
• 期：Complete
• 页码：247-251
• 全文大小：1553 K

文摘

Aiming at further improvement of high-temperature oxidation and corrosion resistance, 11CrODS steel with martensitic base structure has been previously developed, as a candidate fuel cladding material for 4th generation advanced nuclear reactors. In this study, the microstructure of 11CrODS steel was characterized by means of EBSD and nanoindentation hardness measurement. The continuous cooling transformation (CCT) diagram was constructed. Upper critical cooling rate, which is minimum cooling rate necessary to form martensitic structure, was derived to be 60 °C/min (3600 °C/h). In contrast, lower critical cooling rate preventing from martensite formation, was derived to be 10 °C/min (600 °C/h). An area fraction of so called residual ferrite was estimated by image processing of EBSD-IQ map to be 21% of the total area. This fraction of the residual ferrite in 11CrODS steel was evaluated by considering the driving force for α to γ reverse transformation.