The Influence of Composition and Hot Processes on Heat Affected Zone and Weld Metal Behavior and Mechnacal Properties of Ti Grade 5 and Stainless Steel

Abstract: This thesis discusses on results of experiments carried outwith austenitic, duplex and super duplex stainless steels andTi-6Al-4V. In these it has been seen that the heat cycle duringwelding or weld simulation has a great effect on the propertiesof thematerials. The properties are related to the resultedgrain size after processing, as well as, to the chemicalcomposition of the material. The thesis discusses on the grainsize resulted after hot processing and how the properties areinfluenced by it. Also, it has been seen how large grain sizeinfluences the fracture toughness of the duplex stainlesssteel. The CTOD values become so low that an alternativeproduction method should be used instead of casting. The thesisdescribes the behavior of grain size in the hot processing ofTi-6Al-4V and impact toughness resulted by various weldingprocesses. The thesis shows correlation between grain growthbehavior of metallurgically different materials, i.e. duplexstainless steel, Ti-6Al-4V and quenced and tempered low alloysteel.Keywords:Stainless steel, Duplex Stainless Steel,Titanium Grade 5, Ti-6Al-4V microstructure, mechanicalproperties, welding, welding simulation