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Microstructure Characteristics in Mo–Cu/GH4169 Dissimilar Joint by Gas Tungsten Arc Welding with Cr25–Ni13 Filler Metal

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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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Keywords: DISSIMILAR METAL; GH4169 SUPERALLOY; GTAW; MICROSTRUCTURE; Mo–Cu ALLOY

Document Type: Research Article

Publication date: September 1, 2019

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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