Master Curve Fracture Toughness Characterization of Eurofer97 Steel Variants Using Miniature Multi-Notch Bend Bar Specimens for Fusion Applications

Conference · Mon Jul 01 00:00:00 EDT 2019

DOI:https://doi.org/10.1115/PVP2019-93797· OSTI ID:1607205

Chen, Xiang ^[1]; Sokolov, Mikhail A. ^[1]; Bhattacharya, Arunodaya ^[1]; Clowers, Logan ^[1]; Seibert, Tim Graening ^[1]; Kato, Yutai ^[1]; Rieth, Michael ^[2]

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1. ORNL
2. Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany

In this study, we performed fracture toughness testing of ten Eurofer97 steel variants using precracked miniature multi-notch bend bar (M4CVN) specimens based on the Master Curve method in the ASTM E1921 standard. Additional Vickers microhardness and room temperature tensile testing complemented the fracture toughness testing. Compared with standard Eurofer97, the ten variants didn’t show a comprehensive improvement of mechanical properties. The Master Curve method was found to yield a reasonable prediction of fracture toughness results obtained from M4CVN specimens with most valid fracture toughness data within the 2% and 98% tolerance boundaries of the Master Curve. The three-parameter Weibull distribution with Weibull exponent b = 4 also yielded excellent prediction of the relationship between fracture toughness results KJc and the cumulative probability for failure pf for one steel variant.

• Research Organization: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE; USDOE Office of Science (SC)
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1607205
• Country of Publication: United States
• Language: English