Abstract
In present study, the strengthening mechanism of friction-stir welded Fe-17Mn binary alloy was quantitatively investigated by means of the electron microscopic observation in stir zone center and the dislocation-based constitutive equation. As the rotation speed increased from 440 to 760 rpm, both fraction of thermal ε martensite and prior γ austenite size were elevated due to the severely frictional heat, whereas the dislocations were annihilated. Though different microstructural feature of welds, the stir zone center had similar hardness and yield strength regardless of rotation speed. It was because of notable increase in ε martensite hardening as well as marginal decreases in hardening in grain boundary and dislocation with increasing rotation speed.
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