Preliminary results on the development of vacuum-brazed joints for cyrogenic wind tunnel aerofoil models

Conference · Fri Jan 01 04:00:00 EST 1982 · Adv. Cryog. Eng.; (United States)

OSTI ID:6263046

Wigley, D A; Lawing, P L; Sandefur, P G

Initial trials carried out at the NASA Langley Research Center in the investigation of cryogenic wind tunnel joint construction demonstrated that diffusion-assisted brazed joints could be formed in 17-4 PH, 15-5 PH, AISI-type 347, and Nitronic 40 stainless steels using electrodeposited copper as the bonding agent. Subsequent work has concentrated on 15-5 PH and Nitronic 40 using thin foils of pure copper and Nicrobraz LM, a commercially available nickel-based alloy containing boron and silicon melting point depressants. This paper summarizes the work carried out to understand and evaluate these bonds and their metallurgical characteristics. The results indicate that a high-strength void-free bond can be formed by the vacuum brazing of stainless steels using copper- and nickel-based filler alloys. The Nitronic 40 brazed joints show strengths in excess of the yield strengths of the parent metal. The poor toughness of 15-5 PH stainless steel at cryogenic temperatures tends to disqualify its use in critical areas of low-temperature aerofoil models.

• Research Organization: University of Southampton, Southampton
• OSTI ID: 6263046
• Report Number(s): CONF-810835-
• Conference Information: Journal Name: Adv. Cryog. Eng.; (United States) Journal Volume: 28
• Country of Publication: United States
• Language: English

Related Subjects

420201* -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AERODYNAMICS
AIRFOILS
ALLOYS
BRAZED JOINTS
BUILDING MATERIALS
CHROMIUM ALLOYS
COOLANTS
CORROSION RESISTANT ALLOYS
CRYOGENICS
ELEMENTS
FLUID MECHANICS
IRON ALLOYS
IRON BASE ALLOYS
JOINTS
MATERIALS
MATERIALS TESTING
MECHANICS
NITROGEN
NONMETALS
STAINLESS STEELS
STEELS
TESTING
TUNNELS
UNDERGROUND FACILITIES
WELDED JOINTS
WIND TUNNELS