Accession Number:

AD0601780

Title:

THE STRUCTURAL STABILITY OF WELDS IN COLUMBIUM ALLOYS.

Descriptive Note:

Quarterly progress rept. no. 3, 1 Nov 63-1 Feb 64,

Corporate Author:

GENERAL ELECTRIC CO CINCINNATI OHIO

Personal Author(s):

• Yount,R. E.

Report Date:

1964-02-10

Pagination or Media Count:

58.0

Abstract:

Aging studies of the three weld conditions were essentially completed and the aging kinetics compared. The B-66 .125 inch thick sheet was received and the evaluation of the effect of thickness initiated. Several conclusions have developed. 1 Interdendritic spacings of the weld metal are more strongly influenced by power input and cooling rate during welding than by chemical composition. 2 As-welded bend transition is dependent on welding speed. The faster the speed the lower the bend transition temperature for the condition studied. 3 The kinetics of aging in the temperature range of 1600 - 2200F is strongly influenced by interdendritic spacing, hence by weld parameters. The larger the interdendritic spacing the more sluggish the aging reaction. 4 A double aging reaction has been found in the B-66 alloy, one which occurs in the weld zone and a second which involves the heat affected zone. Author

Descriptors:

• *NIOBIUM ALLOYS
• WELDS
• WELDS
• GRAIN STRUCTURES(METALLURGY)
• STABILITY
• IMPURITIES
• COOLING
• DUCTILITY
• TRANSITION TEMPERATURE
• HARDNESS
• LOADS(FORCES)
• TUNGSTEN ALLOYS
• MOLYBDENUM ALLOYS
• VANADIUM ALLOYS
• ZIRCONIUM ALLOYS

Subject Categories:

Distribution Statement:

APPROVED FOR PUBLIC RELEASE