TY - JOUR
T1 - TEM and HRTEM study of oxide particles in an Al-alloyed high-Cr oxide dispersion strengthened ferritic steel with Hf addition
AU - Dou, Peng
AU - Kimura, Akihiko
AU - Kasada, Ryuta
AU - Okuda, Takanari
AU - Inoue, Masaki
AU - Ukai, Shigeharu
AU - Ohnuki, Somei
AU - Fujisawa, Toshiharu
AU - Abe, Fujio
AU - Jiang, Shan
AU - Yang, Zhigang
N1 - Funding Information:
This work was sponsored by Natural Science Foundation of China with grant No. 51571042 and fund of Key Laboratory of Advanced Materials (MOE) with Grant. No. 2016AML07. This study also includes the result of ?R&D of corrosion resistant super ODS steel for highly efficient nuclear systems? entrusted to Kyoto University by the Ministry of Education, Culture, Sports, Science and Technology of Japan (MEXT).
PY - 2017/3/1
Y1 - 2017/3/1
N2 - The nanoparticles in an Al-alloyed high-Cr oxide dispersion strengthened (ODS) ferritic steel with Hf addition, i.e., SOC-16 (Fe-15Cr-2W-0.1Ti-4Al-0.62Hf-0.35Y2O3), have been examined by transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). Relative to an Al-alloyed high-Cr ODS ferritic steel without Hf addition, i.e., SOC-9 (Fe-15.5Cr-2W-0.1Ti-4Al-0.35Y2O3), the dispersion morphology and coherency of the oxide nanoparticles in SOC-16 were significantly improved. Almost all the small nanoparticles (diameter <10 nm) in SOC-16 were found to be consistent with cubic Y2Hf2O7 oxides with the anion-deficient fluorite structure and coherent with the bcc steel matrix. The larger particles (diameter >10 nm) were also mainly identified as cubic Y2Hf2O7 oxides with the anion-deficient fluorite structure. The results presented here are compared with those of SOC-9 with a brief discussion of the underlying mechanisms of the unusual thermal and irradiation stabilities of the oxides as well as the superior strength, excellent irradiation tolerance and extraordinary corrosion resistance of SOC-16.
AB - The nanoparticles in an Al-alloyed high-Cr oxide dispersion strengthened (ODS) ferritic steel with Hf addition, i.e., SOC-16 (Fe-15Cr-2W-0.1Ti-4Al-0.62Hf-0.35Y2O3), have been examined by transmission electron microscopy (TEM) and high resolution transmission electron microscopy (HRTEM). Relative to an Al-alloyed high-Cr ODS ferritic steel without Hf addition, i.e., SOC-9 (Fe-15.5Cr-2W-0.1Ti-4Al-0.35Y2O3), the dispersion morphology and coherency of the oxide nanoparticles in SOC-16 were significantly improved. Almost all the small nanoparticles (diameter <10 nm) in SOC-16 were found to be consistent with cubic Y2Hf2O7 oxides with the anion-deficient fluorite structure and coherent with the bcc steel matrix. The larger particles (diameter >10 nm) were also mainly identified as cubic Y2Hf2O7 oxides with the anion-deficient fluorite structure. The results presented here are compared with those of SOC-9 with a brief discussion of the underlying mechanisms of the unusual thermal and irradiation stabilities of the oxides as well as the superior strength, excellent irradiation tolerance and extraordinary corrosion resistance of SOC-16.
KW - Coherency
KW - High resolution transmission electron microscopy (HRTEM)
KW - Misfit moiré fringes
KW - Oxide-dispersion-strengthened (ODS) steel
KW - Transmission electron microscopy (TEM)
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U2 - 10.1016/j.jnucmat.2016.12.001
DO - 10.1016/j.jnucmat.2016.12.001
M3 - Article
AN - SCOPUS:85008881540
VL - 485
SP - 189
EP - 201
JO - Journal of Nuclear Materials
JF - Journal of Nuclear Materials
SN - 0022-3115
ER -