Subtask 12D1: Impact properties of production heat of V-4Cr-4Ti

Technical Report · Wed Mar 01 04:00:00 EST 1995

DOI:https://doi.org/10.2172/415177· OSTI ID:415177

Chung, H. M.; Nowicki, L.; Smith, D. L. ^[1]

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1. Argonne National Lab., IL (United States)

Following previous reports of excellent properties of a laboratory heat of V-4Cr-4Ti, the alloy identified as the primary vanadium-based candidate for application as fusion reactor structural components, a large production-scale (500-kg) heat of the alloy was fabricated successfully. Since impact toughness has been known to be most sensitive to alloy composition and microstructure, impact testing of the production-scale heat was conducted in this work between -200{degrees}C and +200{degrees}C. A 500-kg heat of V-4Cr-4Ti, an alloy identified previously as the primary vanadium-based candidate alloy for application as fusion reactor structural components, has been produced successfully. Impact tests were conducted at -196{degrees}C to 150{degrees}C on 1/3-size Charpy specimens of the scale-up heat in as-rolled condition and after annealing for 1 h at 950, 1000, and 1050{degrees}C in high-quality vacuum. The annealed material remained ductile at all test temperatures; the ductile-brittle transition temperature (DBTT) was lower than -200{degrees}C. The upper-shelf energy of the production-scale heat was similar to that of the laboratory-scale ({approx}30-kg) heat of V-4Cr-4Ti investigated previously. Effect of annealing temperature was not significant; however, annealing at 1000{degrees}C for 1 h not only produces best impact properties but also ensures a sufficient tolerance to effect of temperature inhomogeneity expected when annealing large components. Effect of notch geometry was also investigated on the production heat. When annealed properly (e.g., at 1000{degrees}C for 1 h), impact properties were not sensitive to notch geometry (45{degrees}-notch, root radius 0.25 mm; and 300-notch, root radius 0.08 mm). 11 refs., 6 figs., 1 tab.

• Research Organization: Argonne National Lab., IL (United States)
• OSTI ID: 415177
• Report Number(s): ANL/FPP/TM--287; ITER/US--95/IV-MAT-10; ON: DE96000984
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
CHARPY TEST
CHROMIUM ALLOYS
IMPACT STRENGTH
ITER TOKAMAK
TEMPERATURE RANGE 0065-0273 K
TITANIUM ALLOYS
VANADIUM BASE ALLOYS