Friction stir welding process microstructure and property of weld for Zr-Sn-Nb-Cr-Fe zirconium alloys
Process performance,microstructure and corro-sion properties of friction stir welded(FSW)joints of Zr-Sn-Nb-Cr-Fe zirconium alloys were studied in the present paper.The results indicate that the recommended zirconium alloys FSW joints with good shape and no welding defects were ob-tained by W-25%Re stir tool under the conditions of 250 rpm rotational speed,40 mm/min welding speed,10 kN axial force and argon protection.In stir zone(SZ),the severe plastic de-formation leads to dynamic recrystallization,diffusion of alloy-ing element and grain refinement and grain size increases with the increase of rotational speed.As the same time,a large number of irregularly shaped second phase particles were pre-cipitated at the grain boundaries.These FSW joints prepared by different welding parameters exhibited black,bright and dense oxide film after being corroded in neutral water at 360℃,18.6 MPa for 72 hours.However,the corrosion resistance of FSW joints decreases with the increase of rotational speed.
zirconium alloysfriction stir weldingweld-ing process performancemicrostructurecorrosion property
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NSTL
万方数据
维普
