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Impact properties and hardening behavior of laser and electron-beam welds of V-4Cr-4Ti [electronic resource].

Published
Oak Ridge, Tenn. : Oak Ridge National Laboratory, 1996.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description
pages 55-58 : digital, PDF file
Additional Creators
Oak Ridge National Laboratory and United States. Department of Energy. Office of Scientific and Technical Information
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Summary
The authors are conducting a program to develop an optimal laser welding procedure that can be applied to large-scale fusion-reactor structural components to be fabricated from vanadium-base alloys. Results of initial investigation of mechanical properties and hardening behavior of laser and electron-beam (EB) welds of the production-scale heat of V-4Cr-4Ti (500-kg Heat 832665) in as-welded and postwelding heat-treated (PWHT) conditions are presented in this paper. The laser weld was produced in air using a 6-kW continuous CO₂ laser at a welding speed of ≈45 mm/s. Microhardness of the laser welds was somewhat higher than that of the base metal, which was annealed at a nominal temperature of ≈1050°C for 2 h in the factory. In spite of the moderate hardening, ductile-brittle transition temperatures (DBTTs) of the initial laser (≈80°C) and EB (≈30°C) welds were significantly higher than that of the base metal (≈−170°C). However, excellent impact properties, with DBTT < −80°C and similar to those of the base metal, could be restored in both the laser and EB welds by postwelding annealing at 1000°C for 1 h in vacuum.
Report Numbers
E 1.99:doe/er--0313/20
doe/er--0313/20
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Other Subject(s)
Note
Published through SciTech Connect.
10/01/1996.
"doe/er--0313/20"
"DE97000700"
Smith, D.L.; Park, J.H.; Chung, H.M.; Tsai, H.C.; Strain, R.V.
View MARC record | catkey: 14743627