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On the helium bubble swelling in nano-oxide dispersion-strengthened steels

Journal of Materials Science & Technology 2022年第10期105卷 172-181页

作者： Vladimir Krsjak Tielong Shen Jarmila Degmova Stanislav Sojak Erik Korpas Pavol Noga Werner Egger Bingsheng Li Vladimir Slugen Frank A.Garner Slovak University of Technology Faculty of Electrical Engineering and Information TechnologyInstitute of Nuclear and Physical EngineeringIlkovicova 3Bratislava 81219Slovakia Chinese Academy of Sciences Institute of Modern PhysicsLanzhou 730000China Slovak University of Technology Faculty of Materials Science and TechnologyAdvanced Technologies Research InstituteJana Bottu 2781/25Trnava 91724Slovakia Universität der Bundeswehr München Institut für Angewandte Physik und Messtechnik LRT2Werner-Heisenberg-Weg 39Neubiberg85577Germany Southwest University of Science and Technology State Key Laboratory for Environment-friendly Energy MaterialsMianyangSichuan 621010China Texas A&M University Nuclear Engineering DepartmentCollege StationTX 77843USA Radiation Effects Consulting LLC Richland WA 99354USA

The development of structural materials resistant to harsh radiation environments requires an in-depth understanding of the early stage of the aging *** radiation environments with high transmutation helium production rates such as in fusion and spallation applications,even materials with otherwise acceptable radiation stability may suffer from radiation embrittlement related to helium bubble *** theoretical modeling of helium-assisted cavity nucleation in pure metals and simple alloys provides some useful guidelines at the atomic scale level,these,however,do not overlap with the size resolution of available experimental *** this study,we employed slow positron beam spectroscopy to characterize the nucleation and growth of nano-scale helium bubbles in martensitic steels strengthened by thermodynamically stable nano-oxide *** combination with transmission electron microscopy,we experimentally characterized the evolution of helium bubbles from small clusters of radiation-induced vacancies to large cavities well resolvable by *** radiation resistance of oxide-dispersion strengthened steels dominates only in the early stages of bubble evolution,where positron lifetime measurements provide a missing piece of the microstructural puzzle conventionally constructed by TEM.

关键词： Ion irradiation Bubble swelling Helium Positron annihilation spectroscopy oxide dispersion strengthened steels

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Residual Ferrite Control of 9Cr ODS steels by Tailoring Reverse Austenite Transformation

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Acta Metallurgica Sinica(English Letters) 2021年第2期34卷 187-195页

作者： Xiaosheng Zhou Hao Chen Chenxi Liu Yongchang Liu Key Laboratory for Advanced Materials of Ministry of Education School of Materials Science and EngineeringTsinghua UniversityBeijing 100084China State Key Lab of Hydraulic Engineering Simulation and Safety School of Materials Science and EngineeringTianjin UniversityTianjin 300354China

By tailoring the reverse austenite transformation behavior of 9 Cr oxide dispersion strengthened(ODS)ferritic/martensitic steels,the residual ferrite in ODS steels can be *** reverse austenite transformation behavior of ODS steels is closely related to the initial microstructure conditions prior to austenite *** the spark plasma sintered steels,both the amount and size of residual ferrite decrease with increasing heating ***,high heating rate will increase the amount and size of residual ferrite in annealed ODS *** an isothermal treatment is performed at temperatures above Ac 1,lower isothermal temperature has a more evident effect on the ferrite distribution in spark plasma sintered steels than that in annealed ones.

关键词： oxide dispersion strengthened steels Residual ferrite Austenite transformation

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