EXPERIMENTAL STUDY ON IRON-BASED ALLOY AS CLADDING LAYER-IMPROVING HIGH TEMPERATURE OXIDATION RESISTANCE OF FURNACE ALLOY

摘要

Furnace superalloy was applied in harsh environment within the erosion of high temperature and oxidizing atmosphere. With plasma powder surfacing technology, iron-based alloy powder was sprayed on the surface of 310S stainless steel to form oxidation layer that increases the oxidation resistance and reduces the cost of materials. With optimum technological parameters, in this paper, oxidation test of 100 hours on iron-based cladding alloy and furnace alloy were carried out at 1200°C. The technique of XRF, XRD and EDS were used to characterize composition, oxide morphologies and surface mechanical properties. The results showed that: Element composition of cladding layer formed by Plasma powder surfacing was well distributed. Its oxidation weight gain rate of 100 hours was 0.4552g/m~2h, belonged to antioxidant level. The oxidation weight gain rate of furnace alloy was 1.4617g/m~2h, belonged time-antioxidant level. And on the mechanical comparison test, surfacing alloy is relatively excellent than furnace alloy.