Abstract
Based on the composition of 30% Mn, 10% Al, balance Fe, Fe-Mn-Al alloys with different carbon contents and thus different ferrite contents were studied. Tensile tests and U-bend tests on the autogenous GTA welded specimen were utilized to evaluate the weldability. FN measurement, optical metallography, and SEM-EDAX were used to study the microstructural characteristics of the weld metal and the base metal heat affected zone. It was found that the carbon content has a strong influence on the amount of residual ferrite in the Fe-Mn-Al weld metals studied. After heat treatment, the amount of residual ferrite is reduced and annealing twins were found in the weld metal. Tensile strengths in excess of 900 MPa in both the longitudinal and transverse welding directions were obtained. The elongation of the butt-jointwelded specimen is substantially less than that of the base metal, especially for the fully austenitic weld metal. U-bend test results gave an indication of good weldability for the Fe-Mn-Al alloys.
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