SPECIMEN SIZE AND GEOMETRY EFFECTS ON THE MASTER CURVE FRACTURE TOUGHNESS MEASUREMENTS OF EUROFER97 AND F82H STEELSa

Xiang Frank Chen; Mikhail A. Sokolov; Sehila M. Gonzalez De Vicente; Yutai Katoh

doi:10.1115/PVP2022-84514

SPECIMEN SIZE AND GEOMETRY EFFECTS ON THE MASTER CURVE FRACTURE TOUGHNESS MEASUREMENTS OF EUROFER97 AND F82H STEELS^a

Xiang Frank Chen, Mikhail A. Sokolov, Sehila M. Gonzalez De Vicente, Yutai Katoh

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2 Scopus citations

Abstract

EUROFER97 and F82H are two leading reduced-activation ferritic-martensitic (RAFM) steels for fusion blanket applications. Exposure to the harsh environment of fusion reactors can result in severe degradation of materials fracture toughness (FT). Thus, the post-irradiation evaluation of FT is critical to understanding the material behavior. Due to the space constraint of irradiation facilities, the development of small specimen test techniques (SSTT) is necessary to evaluate the performance of irradiated materials. In this study, we evaluated the specimen size and geometry effects on the ductile-to-brittle transition FT of EUROFER97 batch-3 and F82H-BA12 steels. The specimen thicknesses ranged from 1.65 to 12.7 mm and the geometries included 1.65 mm bend bar, 4 mm mini-compact tension (miniCT), and 0.5T compact tension (CT) specimens. Fracture toughness testing and evaluations were performed using the Master Curve method in the ASTM E1921-19 standard. After size correction to 1T size using the Master Curve method, no specimen size effect was observed between the 4 mm miniCT and 0.5T CT specimens for the Master Curve reference temperature T0Q, while the bend bars yielded a higher T0Q. A strong effect of fatigue precrack front straightness on T0Q for 0.5T CT specimens was observed. The minimum number of specimens needed for each specimen geometry has been determined.

Original language	English
Title of host publication	Codes and Standards
Publisher	American Society of Mechanical Engineers (ASME)
ISBN (Electronic)	9780791886144
DOIs	https://doi.org/10.1115/PVP2022-84514
State	Published - 2022
Event	ASME 2022 Pressure Vessels and Piping Conference, PVP 2022 - Las Vegas, United States Duration: Jul 17 2022 → Jul 22 2022

Publication series

Name	American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP
Volume	1
ISSN (Print)	0277-027X

Conference

Conference	ASME 2022 Pressure Vessels and Piping Conference, PVP 2022
Country/Territory	United States
City	Las Vegas
Period	07/17/22 → 07/22/22

Funding

This research was sponsored by the U.S. Department of Energy, Office of Fusion Energy Sciences, under contract DE-AC05-00OR22725 with UT-Battelle, LLC. We also appreciate the support from the IAEA CRP F13017 “Towards the Standardization of Small Specimen Test Techniques for Fusion Applications”. The views and opinions expressed herein do not necessarily reflect those of the International Atomic Energy Agency. The raw materials used in this study, EUROFER97 Batch 3 and F82H BA12, were provided by Fusion for Energy (F4E) and National Institutes for Quantum and Radiological Science and Technology (QST), respectively. This research was sponsored by the U.S. Department of Energy, Office of Fusion Energy Sciences, under contract DEAC05-00OR22725 with UT-Battelle, LLC. We also appreciate the support from the IAEA CRP F13017 “Towards the Standardization of Small Specimen Test Techniques for Fusion Applications”. The views and opinions expressed herein do not necessarily reflect those of the International Atomic Energy Agency. The raw materials used in this study, EUROFER97 Batch 3 and F82H BA12, were provided by Fusion for Energy (F4E) and National Institutes for Quantum and Radiological Science and Technology (QST), respectively.

Keywords

EUROFER97
F82H
Fracture Toughness
Fusion
Master Curve
Small Specimen Test Techniques
Specimen Size Effect

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access to Document

10.1115/PVP2022-84514

Cite this

Chen, X. F., Sokolov, M. A., Gonzalez De Vicente, S. M., & Katoh, Y. (2022). SPECIMEN SIZE AND GEOMETRY EFFECTS ON THE MASTER CURVE FRACTURE TOUGHNESS MEASUREMENTS OF EUROFER97 AND F82H STEELS^a. In Codes and Standards Article V001T01A048 (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 1). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/PVP2022-84514

Chen, Xiang Frank ; Sokolov, Mikhail A. ; Gonzalez De Vicente, Sehila M. et al. / SPECIMEN SIZE AND GEOMETRY EFFECTS ON THE MASTER CURVE FRACTURE TOUGHNESS MEASUREMENTS OF EUROFER97 AND F82H STEELS^a. Codes and Standards. American Society of Mechanical Engineers (ASME), 2022. (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP).

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title = "SPECIMEN SIZE AND GEOMETRY EFFECTS ON THE MASTER CURVE FRACTURE TOUGHNESS MEASUREMENTS OF EUROFER97 AND F82H STEELSa",

abstract = "EUROFER97 and F82H are two leading reduced-activation ferritic-martensitic (RAFM) steels for fusion blanket applications. Exposure to the harsh environment of fusion reactors can result in severe degradation of materials fracture toughness (FT). Thus, the post-irradiation evaluation of FT is critical to understanding the material behavior. Due to the space constraint of irradiation facilities, the development of small specimen test techniques (SSTT) is necessary to evaluate the performance of irradiated materials. In this study, we evaluated the specimen size and geometry effects on the ductile-to-brittle transition FT of EUROFER97 batch-3 and F82H-BA12 steels. The specimen thicknesses ranged from 1.65 to 12.7 mm and the geometries included 1.65 mm bend bar, 4 mm mini-compact tension (miniCT), and 0.5T compact tension (CT) specimens. Fracture toughness testing and evaluations were performed using the Master Curve method in the ASTM E1921-19 standard. After size correction to 1T size using the Master Curve method, no specimen size effect was observed between the 4 mm miniCT and 0.5T CT specimens for the Master Curve reference temperature T0Q, while the bend bars yielded a higher T0Q. A strong effect of fatigue precrack front straightness on T0Q for 0.5T CT specimens was observed. The minimum number of specimens needed for each specimen geometry has been determined.",

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author = "Chen, {Xiang Frank} and Sokolov, {Mikhail A.} and {Gonzalez De Vicente}, {Sehila M.} and Yutai Katoh",

note = "Publisher Copyright: Copyright {\textcopyright} 2022 by ASME and The United States Government.; ASME 2022 Pressure Vessels and Piping Conference, PVP 2022 ; Conference date: 17-07-2022 Through 22-07-2022",

year = "2022",

doi = "10.1115/PVP2022-84514",

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Chen, XF , Sokolov, MA, Gonzalez De Vicente, SM & Katoh, Y 2022, SPECIMEN SIZE AND GEOMETRY EFFECTS ON THE MASTER CURVE FRACTURE TOUGHNESS MEASUREMENTS OF EUROFER97 AND F82H STEELS^a. in Codes and Standards., V001T01A048, American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP, vol. 1, American Society of Mechanical Engineers (ASME), ASME 2022 Pressure Vessels and Piping Conference, PVP 2022, Las Vegas, United States, 07/17/22. https://doi.org/10.1115/PVP2022-84514

SPECIMEN SIZE AND GEOMETRY EFFECTS ON THE MASTER CURVE FRACTURE TOUGHNESS MEASUREMENTS OF EUROFER97 AND F82H STEELS^a. / Chen, Xiang Frank ; Sokolov, Mikhail A.; Gonzalez De Vicente, Sehila M. et al.
Codes and Standards. American Society of Mechanical Engineers (ASME), 2022. V001T01A048 (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP; Vol. 1).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AB - EUROFER97 and F82H are two leading reduced-activation ferritic-martensitic (RAFM) steels for fusion blanket applications. Exposure to the harsh environment of fusion reactors can result in severe degradation of materials fracture toughness (FT). Thus, the post-irradiation evaluation of FT is critical to understanding the material behavior. Due to the space constraint of irradiation facilities, the development of small specimen test techniques (SSTT) is necessary to evaluate the performance of irradiated materials. In this study, we evaluated the specimen size and geometry effects on the ductile-to-brittle transition FT of EUROFER97 batch-3 and F82H-BA12 steels. The specimen thicknesses ranged from 1.65 to 12.7 mm and the geometries included 1.65 mm bend bar, 4 mm mini-compact tension (miniCT), and 0.5T compact tension (CT) specimens. Fracture toughness testing and evaluations were performed using the Master Curve method in the ASTM E1921-19 standard. After size correction to 1T size using the Master Curve method, no specimen size effect was observed between the 4 mm miniCT and 0.5T CT specimens for the Master Curve reference temperature T0Q, while the bend bars yielded a higher T0Q. A strong effect of fatigue precrack front straightness on T0Q for 0.5T CT specimens was observed. The minimum number of specimens needed for each specimen geometry has been determined.

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Chen XF , Sokolov MA, Gonzalez De Vicente SM, Katoh Y. SPECIMEN SIZE AND GEOMETRY EFFECTS ON THE MASTER CURVE FRACTURE TOUGHNESS MEASUREMENTS OF EUROFER97 AND F82H STEELS^a. In Codes and Standards. American Society of Mechanical Engineers (ASME). 2022. V001T01A048. (American Society of Mechanical Engineers, Pressure Vessels and Piping Division (Publication) PVP). doi: 10.1115/PVP2022-84514