A novel design of transitional layer structure between reduced activation ferritic martensitic steels and tungsten for plasma facing materials

Gräning, Tim; Tan, Lizhen; Robin, Ishtiaque; Katoh, Yutai; Yang, Ying

doi:10.1016/j.jmrt.2023.04.019

A novel design of transitional layer structure between reduced activation ferritic martensitic steels and tungsten for plasma facing materials

Journal Article · Sat Apr 08 00:00:00 EDT 2023 · Journal of Materials Research and Technology

DOI:https://doi.org/10.1016/j.jmrt.2023.04.019· OSTI ID:1991726

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Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
Univ. of Tennessee, Knoxville, TN (United States)

Plasma-facing components (PFCs) are among the most critical gaps for fusion energy to establish technical and economic feasibility. Tungsten as a first wall/blanket material in PFCs requires to be integrating with reduced activation ferritic martensitic (RAFM) steels as a structural component. Currently, major drawbacks are the requirement of brazing, the formation of a brittle interface, and a large difference between the coefficients of thermal expansion of tungsten and steel. Here, a novel transitional multilayer structure was designed and investigated to join tungsten and RAFM steels using three interlayers. The composition of each interlayer was selected based on computational thermodynamics and diffusion kinetics to ensure a body-centered cubic (bcc) single-phase structure and prevent the formation of a brittle intermetallic phase region in the temperature range of 600–1150 °C. Although the transitional layer structure was designed for additive manufacturing, spark plasma sintering (SPS) as proof of concept was used to bond the individual layers. Interfaces were investigated using scanning and transmission electron microscopy methods but no layered intermetallic phase was observed. Nanoindentation maps across the interface suggest major hardness differences at the interface between tungsten and the vanadium interlayer, as well as the interface between RAFM steel and the FeCrAl interlayer.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Advanced Research Projects Agency - Energy (ARPA-E); USDOE Office of Science (SC)

Grant/Contract Number:: AC05-00OR22725

OSTI ID:: 1991726

Journal Information:: Journal of Materials Research and Technology, Journal Name: Journal of Materials Research and Technology Vol. 24; ISSN 2238-7854

Publisher:: Brazilian Metallurgical, Materials and Mining AssociationCopyright Statement

Country of Publication:: United States

Language:: English

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