Microstructure and mechanical behaviour of graphene reinforced friction stir welded joint of nickel-based superalloy Incoloy 925
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The effect of reinforcement strategy on graphene nanoparticles distribution in terms of metallurgical and mechanicalproperties of Incoloy 925 alloy friction stir welding was investigated. The friction stir welding was performed at differentwelding speeds (20-100 mm/min) and tool rotational speeds (300-500 rpm) using a tapered pin tool. The defect-free welds wereobtained at a tool rotational speed of 400 rpm, and welding speeds of 20 mm/min, 30 mm/min, and 40 mm/min, respectively. The cross-sectional microstructure of the weld joints was characterized by SEM and EDX and revealed that graphene particleswere evenly distributed inside the nugget zone. Results achieved through Raman spectrometry analysis confirmed the presenceof graphene. Because graphene was distributed consistently across the nugget zone, the microhardness of the material hasgrown to around 320 HV. In comparison to the base metal, the microhardness of the graphene-reinforced Incoloy 925 stir zonewas found to be 51 percent higher. Compared to the base metal, the friction stir weld joints exhibited a high joint efficiency(ranging from 90% to 97.5%).
Abstract
The effect of reinforcement strategy on graphene nanoparticles distribution in terms of metallurgical and mechanicalproperties of Incoloy 925 alloy friction stir welding was investigated. The friction stir welding was performed at differentwelding speeds (20-100 mm/min) and tool rotational speeds (300-500 rpm) using a tapered pin tool. The defect-free welds wereobtained at a tool rotational speed of 400 rpm, and welding speeds of 20 mm/min, 30 mm/min, and 40 mm/min, respectively. The cross-sectional microstructure of the weld joints was characterized by SEM and EDX and revealed that graphene particleswere evenly distributed inside the nugget zone. Results achieved through Raman spectrometry analysis confirmed the presenceof graphene. Because graphene was distributed consistently across the nugget zone, the microhardness of the material hasgrown to around 320 HV. In comparison to the base metal, the microhardness of the graphene-reinforced Incoloy 925 stir zonewas found to be 51 percent higher. Compared to the base metal, the friction stir weld joints exhibited a high joint efficiency(ranging from 90% to 97.5%).
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