Weldability of Fe[sub 3]Al-type Aluminide
- Oak Ridge National Lab., TN (United States)
An investigation was carried out to determine the weldability of a series of Fe[sub 3]Al-type alloys. Autogenous welds were made on thin sheets of iron aluminide alloys using gas tungsten arc (GTA) and electron beam (EB) welding processes at different travel speeds and power levels. The results indicate that although these alloys can be successfully welded using the EB welding process, some compositions may hot crack during GTA welding. Boron and zirconium additions have been found to promote hot cracking in these alloys. Among the alloys investigated, Fe[sub 3]Al modified with chromium, niobium and carbon (FA-129) showed the most promise for good weldability. Hot-cracking severity of this alloy was further investigated using the Sigmajig test. The minimum threshold stress of 25 ksi measured is within the material range of other aluminides and some commercial stainless steels. Also, some of these alloys exhibited a tendency for cold cracking. This is related to severe hydrogen embrittlement associated with this class of alloys.
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 6789799
- Journal Information:
- Welding Journal (Miami); (United States), Journal Name: Welding Journal (Miami); (United States) Vol. 72:5; ISSN WEJUA3; ISSN 0043-2296
- Country of Publication:
- United States
- Language:
- English
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Weldability of Fe sub 3 Al based iron aluminide alloys
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Related Subjects
360101* -- Metals & Alloys-- Preparation & Fabrication
ALLOYS
ALUMINIUM ALLOYS
ARC WELDING
BORON ADDITIONS
BORON ALLOYS
CARBON ADDITIONS
CHROMIUM ADDITIONS
CHROMIUM ALLOYS
CRACK PROPAGATION
ELECTRON BEAM WELDING
EMBRITTLEMENT
FABRICATION
GAS METAL-ARC WELDING
GAS TUNGSTEN-ARC WELDING
HYDROGEN EMBRITTLEMENT
INTERMETALLIC COMPOUNDS
IRON ALLOYS
JOINING
NIOBIUM ADDITIONS
NIOBIUM ALLOYS
STRESSES
WELDABILITY
WELDING
ZIRCONIUM ADDITIONS
ZIRCONIUM ALLOYS