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), Vol. 72:5; ISSN 0043-2296
- Country of Publication:
- United States
- Language:
- English
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Weldability of Fe{sub 3}Al based iron aluminide alloys
Weldability of Fe sub 3 Al based iron aluminide alloys
Related Subjects
ALUMINIUM ALLOYS
WELDABILITY
IRON ALLOYS
BORON ADDITIONS
CARBON ADDITIONS
CHROMIUM ADDITIONS
CRACK PROPAGATION
ELECTRON BEAM WELDING
GAS TUNGSTEN-ARC WELDING
HYDROGEN EMBRITTLEMENT
INTERMETALLIC COMPOUNDS
NIOBIUM ADDITIONS
STRESSES
ZIRCONIUM ADDITIONS
ALLOYS
ARC WELDING
BORON ALLOYS
CHROMIUM ALLOYS
EMBRITTLEMENT
FABRICATION
GAS METAL-ARC WELDING
JOINING
NIOBIUM ALLOYS
WELDING
ZIRCONIUM ALLOYS
360101* - Metals & Alloys- Preparation & Fabrication