Processing-microstructure relationships in friction stir welding of MA956 oxide dispersion streel

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Author
Baker, Bradford W.
Menon, Sarath K.
McNelley, Terry R.
Brewer, Luke N.
El-Dasher, Bassem
Farmer, Joseph C.
Torres, Sharon G.
Mahoney, Murray W.
Sanderson, Samuel
Date
2014Metadata
Show full item recordAbstract
A comprehensive set of processing-microstructure relationships is presented for friction stir
welded oxide dispersion strengthened MA956 steel. Eight rotational speed/traverse speed
combinations were used to produce friction stir welds on MA956 plates using a polycrystalline cubic
boron nitride tool. Weld conditions with high thermal input produced defect-free, full- penetration
welds. Electron backscatter diffraction results showed a significant increase in grain size, a
persistent body centered cubic torsional texture in the stir zone, and a sharp transition in grain
size across the thermo-mechanically affected zone sensitive to weld parameters. Micro- indentation
showed an asymmetric reduction in hardness across a transverse section of the weld. This gradient
in hardness was greatly increased with higher heat inputs. The decrease in hardness after welding
correlates directly with the increase in grain size and may be explained with a Hall–Petch type
relationship.
Description
The article of record as published may be found at http://dx.doi.org/10.1007/s40553-014-0033-6
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.Collections
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