Weldability of high-toughness iron -- 12 percent-nickel alloys with reactive metal additions of titanium, aluminum, or niobium

Technical Report · Tue Feb 01 04:00:00 EST 1977

OSTI ID:7301253

Delvetian, J H; Stephens, J R; Witzke, W R

Three exceptionally high toughness Fe-12Ni alloys designed for cryogenic service were welded by using the gas tungsten arc welding process. Evaluation of their weldability included equivalent energy fracture toughness tests, transverse weld tensile tests at -196 and 25 C, and weld crack sensitivity tests. The Fe-12Ni-0.25Ti alloy proved extremely weldable for cryogenic applications, having weld and heat affected zone properties comparable to those of the wrought base alloy. The Fe-12Ni-0.5Al alloy had good weld properties only after the weld joint was heat treated. The Fe-12Ni-0.25Nb alloy was not considered weldable for cryogenic use because of its poor weld joint properties at -196 C and its susceptibility to hot cracking. Effects of gas tungsten arc welding on Fe-12Ni alloy sheets containing titanium, aluminum, or niobium additions were studied; the variables included fracture toughness, weld cooling rate, heat treatment, hot rolling, yield strength, tensile strength, elongation (percent), alloy content, interstitial content, and microstructure.

• Research Organization: National Aeronautics and Space Administration, Cleveland, OH (USA). Lewis Research Center
• OSTI ID: 7301253
• Report Number(s): N-77-18249; NASA-TN-D-8403; E-8883
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360101* -- Metals & Alloys-- Preparation & Fabrication
360103 -- Metals & Alloys-- Mechanical Properties
420201 -- Engineering-- Cryogenic Equipment & Devices
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
ARC WELDING
CHEMICAL COMPOSITION
COOLING
CRYOGENICS
CRYSTAL STRUCTURE
FABRICATION
FRACTURE PROPERTIES
GAS TUNGSTEN-ARC WELDING
HEAT TREATMENTS
HOT WORKING
IRON ALLOYS
IRON BASE ALLOYS
JOINING
LOW TEMPERATURE
MATERIALS WORKING
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
MICROSTRUCTURE
NICKEL ALLOYS
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
ROLLING
TENSILE PROPERTIES
TITANIUM ADDITIONS
TITANIUM ALLOYS
WELDING