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Using the Fe_3 Al electrode through manual arc surfacing (MAS), Fe_3AI coatings have been deposited on the stainless steel substrate. The microstructures, hardness and oxidation resistance of the weld overlay have been investigated. The results show that crack-free overlays can be obtained when pre-heating of the substrate at 500℃ and postweld heat treatment at 700℃ were used. Elements of Al, Cr, Ni etc. transferred between the substrate and the overlay, but this does not influence the microhardness of the substrate and the Fe_3Al overlay. Oxidation tests show that the Fe_3 Al overlays have excellent oxidation resistance in comparison with the stainless steel substrate at 800℃ and 900℃.
The microstructures, hardness and oxidation resistance of the weld overlay have been investigated. The results show that crack-free overlays can be obtained. Using the Fe_3 Al electrode through manual arc surfacing (MAS), Fe_3AI coatings have been deposited on the stainless steel substrate. when pre-heating of the substrate at 500 ° C and postweld heat treatment at 700 ° C were used. Elements of Al, Cr, Ni and so on between the substrate and the overlay, but this does not influence the microhardness of the substrate and the Fe_3Al overlay. Oxidation tests show that the Fe_3 Al overlays have excellent oxidation resistance in comparison with the stainless steel substrate at 800 ° C and 900 ° C.