Weldability of iron aluminides
Conference
·
OSTI ID:10185897
Corrosion-resistant weldable iron aluminide alloys are being developed for weld overlay cladding of conventional steels and alloys and possible structural applications. Weld hot cracking can be minimized by careful choice of alloying additions, and hot cracking resistance equivalent to commercial austenitic stainless steels has been achieved. Hydrogen-induced cold cracking, however, continues to be a problem with these alloys, both in monolithic weldments and weld overlay cladding applications. The authors have found that preheat and postweld heat treatment can reduce hydrogen cracking, and that composition is also an important variable. Experiments in controlled atmospheres have confirmed that a major source of hydrogen is provided by the reduction of water vapor from the environment, and that oxygen helps to reduce cracking sensitivity. Concurrently, they are developing filler metals using the aspiration-casting process, for use both as filler metals with the gas tungsten arc process, and as core wire for the production of shielded metal arc electrodes.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-84OR21400
- OSTI ID:
- 10185897
- Report Number(s):
- CONF-9405143--7; ON: DE95000686
- Country of Publication:
- United States
- Language:
- English
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