Session: CS-20-01 Master Curve Method and Applications

Paper Number: 105982

105982 - Specimen Size Effect on Homogeneity Screening of Master Curve Results of Eurofer97 and F82h Steels 

EUROFER97 and F82H are two leading reduced-activation ferritic-martensitic (RAFM) steels for fusion blanket applications. The harsh environment of fusion reactors can result in severe degradation of material mechanical properties, including fracture toughness. Thus, high-fidelity characterization of material fracture toughness is critical to understand material behaviors for long-term operation of fusion reactors. In this study, we performed fracture toughness testing of EUROFER97 and F82H steels covering various specimen sizes based on the ASTM E1921 Master Curve method. The tested specimens included 0.5T compact, 4mm compact, precracked Charpy V-notch, and 1.65mm thickness miniature bend bar specimens. Since the raw materials are expected to be macroscopically homogeneous, it is anticipated that Master Curve test results should pass the homogeneity screening criteria of ASTM E1921. However, it is not clear if specimen size has any impact on the homogeneity screening results. This study aims for addressing this uncertainty by evaluating the potential specimen size effect on ASTM E1921 homogeneity screening criteria. To that end, the same screening procedure will be applied to Master Curve results from the individual specimen type as well as results from mixed specimen types. The findings will shed light on the potential specimen size effect on ASTM E1921 homogeneity screening criteria as well as the effect of data set size.

Presenting Author: Xiang (Frank) Chen Oak Ridge National Laboratory

Presenting Author Biography: Dr. Xiang (Frank) Chen is a research staff member in the Materials Science & Technology Division of Oak Ridge National Laboratory. He is the principal investigator under several U.S. Department of Energy programs, including Fossil Energy and Carbon Management, Light Water Reactor Sustainability, and Fusion Energy Science. His research interests include the mechanical behavior of structural materials under extreme environments and the correlation of mechanical property and materials microstructure. He has over 100 combined publications in peer-reviewed journals, conference proceedings, and technical reports. He is the co-chair for the ASTM E08.07.06 task group in charge of ductile-brittle transition fracture toughness. He is the deputy pathway lead for the Light Water Reactor Sustainability Program Materials Research Pathway. Frank holds a Ph.D. degree and an M.S. degree in Nuclear Engineering from the University of Illinois at Urbana-Champaign and a B.E. degree in Nuclear Engineering from Shanghai Jiao Tong University.

Authors:

Xiang (Frank) Chen Oak Ridge National Laboratory
Marta Serrano CIEMAT
Rebeca Hernández CIEMAT
Mikhail Sokolov Oak Ridge National Laboratory