Materials Science and Technology · 2010 · 19 citations · 14 references
EngineeringMaterials EngineeringMaterials ScienceMechanical Behavior Of MaterialsMetallic MaterialsMetallurgyAlloysElectron Beam WeldingMetalsStructural JointsWeldingWelding ProcessesMetal Impact ToughnessMetastable Alloy PhasesPost-weld Heat Treatment EffectsTensile StrengthToughnessWeld Metal MicrostructureWelded JointsX-ray Diffraction Analysis
The present paper reports the influence of post-weld heat treatment (PWHT) on microstructure and properties of electron beam welded dissimilar joint. Ti 2 AlNb and TC11 alloys were used to fabricate the joints. Three PWHTs were applied to the welded joints. The structures were analysed using optical microscopy, X-ray diffraction, scanning electron microscopy and transmission electron microscopy techniques. The results show that weld metal of the fusion zone is mainly composed of α 2 and β phases. As the energy input increases under different PWHTs, the decomposition degree of metastable phases ( α′/ β) rises, but the tensile strength and impact toughness of the joint reduce. Under each condition, the tensile strength of the joint is higher than that of the TC11 base metal.
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