Processing-microstructure relationships in friction stir welding of MA956 oxide dispersion streel
Baker, Bradford W.
Menon, Sarath K.
McNelley, Terry R.
Brewer, Luke N.
Farmer, Joseph C.
Torres, Sharon G.
Mahoney, Murray W.
MetadataShow full item record
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.
The article of record as published may be found at http://dx.doi.org/10.1007/s40553-014-0033-6
Showing items related by title, author, creator and subject.
Barton, Steven A. (Monterey, California. Naval Postgraduate School, 1982-10);The effects of short quench interruptions on the percentage retained austenite and the hardness and microstructure were investigated for AISI 52100 steel. Effects were observed for two starting microstructures : an ...
Bres, Elizabeth Vaughan. (Monterey, California. Naval Postgraduate School, 1983-12);The heat treatment response of M-50 steel, thermomechanically processed by warm rolling, was compared to that of the same material in a conventional, spheroidize-annealed condition. Warm rolling of M-50 produces markedly ...
Cincotta, Paul E. (1981);The microstructure and hardness of simulated welds in HY-130 cast plate, wrought plate and weld filler metal are investigated. The dependence of these quantities on the austenitizing temperature and the tempering provided ...