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        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
        2014
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        Abstract
        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
        Rights
        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.
        URI
        http://hdl.handle.net/10945/55345
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