The hot ductility behavior of two kinds of 800MPa grade Ti/Nb-added weathering steel has been investigated by using Gleeble3500 thermo-mechanical simulator. The tensile strength (TS) and reduction in area (RA) were acquired to draw hot ductility curve and hot strength curve. SEM fractographs and microstructures of the tensile specimens were analyzed. The results show that the occurrence of the third brittle zone was related to the formation of film-like ferrite phase along the prior austenite grain boundary. Moreover, the addition of alloy elements has a big influence on hot ductility. Deep ductility trough was observed for niobium added titanium containing steel, while titanium containing steel free of niobium shows excellent hot ductility.
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