Microstructure and Chemical Composition Analysis of Double Wire Arc Additive Manufactured Bimetallic Structure
Source abstract
Abstract
In this paper, Inconel 625 and austenite stainless steel 304L bimetal structure were deposited through double wire arc additive manufacturing (DWAAM). Two build strategies were adopted, i.e., bimetallic structures (BMS) of Inconel and stainless steel without and with intermediate layers. Compositions of intermediate layers were gradually varied from pure Inconel 625 with continuously decreasing it to pure 304L stainless steel (SS) by varying the two wires feed rates. Process parameters for deposition of BMS were selected through response surface analyses of single-wire feed depositions of the two wires. Scanning electron microscopy and energy-dispersive spectroscopy tests were conducted to investigate microstructures and chemical composition variations at the interface of BMS. It was found that the chemical composition altered gradually through the addition of intermediate layers compared to the sudden change in the case of BMS without intermediate layers. Microstructure of 100% 304L SS, 50% 304L SS – 50% Inconel 625, and 100% Inconel 625 was found columnar dendritic structure with some amount of secondary dendrite, columnar dendrites with secondary dendrite, and columnar dendrites, respectively. Tensile tests, micro-hardness study and fracture morphology of the BMS revealed better mechanical properties of the BMS with intermediate layers compared to that without intermediate layers. The method exhibited capability of fabrication of high-quality BMS.
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Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · Additive Manufacturing and 3D Printing Technologies · Welding Techniques and Residual Stresses
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References (34)
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