Effect of Ti-Mg Deoxidation on Microstructure and Properties of Electro-Gas Vertical Welding Joint of Low Carbon Steel Plate
Ti-Mg deoxidation process can effectively improve the large heat input welding performance of steels.The microstructure characteristics and influence mechanism of the steel under actual welding conditions need further study.In this paper,Ti-Mg deoxidized steel and ordinary steel were compared and studied,and the large heat input electo-gas vertical welding experiment was carried out.The microstructure and properties of the welded joints were tested.The inclusions in steel were extracted by the method of electrolytic extraction and characterized by scanning electron microscope.The influence mechanism of deoxidation process on the welding microstructure and toughness was analyzed.The results show that fine and dispersed spherical Ti-Mg-O type inclusions are mainly formed in the steel under Ti-Mg composite deoxidization process,which improves the inclusion morphology and reduce the adverse effect on the properties of the steel matrix.In large heat input welding process,the fine oxide particles pin austenite grains in the coarse-grained heat affected zone and eliminate allotriomorphic ferrite and side plate structure,and promote the formation of acicular ferrite,and the impact toughness of the welded joint is significantly improved.
large heat input welding steelTi-Mg deoxidationacicular ferriteimpact toughnesselecto-gas vertical welding
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