Microstructure Characteristics in Mo–Cu/GH4169 Dissimilar Joint by Gas Tungsten Arc Welding with Cr25–Ni13 Filler Metal
The joining of Mo–Cu alloy and GH4169 superalloy was welded together by Gas Tungsten Arc welding (GTAW) with Cr25–Ni13 filler metal. Microstructure, microhardness, element distribution and phase constituents in Mo–Cu/GH4169 joint were investigated by means of field emission scanning electron microscopy, Energy-dispersive Spectrometer and microsclerom, etc. The results indicated that Cu agglomeration regions were formed at the boundary of heat-affected zone with Mo–Cu base metal, and massive Cu phase remained in heat-affected zone close to Mo–Cu. Grain boundaries were flat in heat-affected zone close to GH4169. The microhardness of heat-affected zone nearby Mo–Cu side increased gradually from base metal to heat-affected zone, it reached the peak value at the position in heat-affected zone adjacent to fusion zone, and high-hardness phase was formed in fusion zone and heat-affected zone nearby Mo–Cu side. The microhardness distribution of joint nearby GH4169 was changed little generally. Mo agglomeration regions and Cu agglomeration regions formed in heat-affected zone nearby Mo–Cu side. In fusion zone nearby Mo–Cu side, Mo–Fe compound Mo6Fe7 was formed adjacent to heat-affected zone.
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Document Type: Research Article
Publication date: September 1, 2019
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