Evaluation of Cb--5% Zr fusion welds

Technical Report · Fri Sep 30 04:00:00 EDT 1960

OSTI ID:4318720

Stewart, J R

Declassified 20 Sep 1973. Bend data show that Cb-5Zr alloy has good ductility in the annealed condition. Some cracking occurred during testing of weld specimens in the following condition: as-welded, welded + annealed at 2200 deg F in vacuum, and welded + annealed at 2200 deg F and subsequently placed in a lithium loop at 1800 deg F for 259 h. The failures occurred either in the weld bead or the heat-affected zone, and at bend angles from 30 to 69 deg . Corresponding control weld samples of Cb-1Zr alloy subjected to the same pre-test conditioning all bent 180 deg with no failures. Uniaxial stressrupture data in lithium for parent and weld specimens of Cb-5Zr alloy are also given. The weld efficiency at 1600, 1800, and 2000 deg F was above 100%. Failures occurred only in the heat-affected zone of the welds. The weld specimens also showed a much lower secondary creep rate than the parent specimens tested under the same conditions of temperature and stress. The weld specimens at all temperatures showed good ductility when tested in stressrupture. (auth)

• Research Organization: Pratt and Whitney Aircraft, Middletown, Conn. (USA)
• DOE Contract Number: AT(11-1)-229
• NSA Number: NSA-29-030076
• OSTI ID: 4318720
• Report Number(s): CNLM--2969
• Country of Publication: United States
• Language: English

Related Subjects

*NIOBIUM BASE ALLOYS-- MECHANICAL PROPERTIES
*WELDED JOINTS-- MECHANICAL PROPERTIES
*ZIRCONIUM ALLOYS-- MECHANICAL PROPERTIES
ANNEALING
BENDING
CREEP
DUCTILITY
FAILURES
HEAT AFFECTED ZONE
LITHIUM
N50230* --Metals
Ceramics
& Other Materials--Metals & Alloys--Properties
Structure & Phase Studies
RUPTURES