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

Technical Report · Tue Feb 01 00:00:00 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; TRN: 77-016152
• Country of Publication: United States
• Language: English

Related Subjects

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