Microstructures and mechanical behavior of the bimetallic additively-manufactured structure (BAMS) of austenitic stainless steel and Inconel 625

Published on May 30, 2021in Journal of Materials Science & Technology6.155
· DOI :10.1016/J.JMST.2020.10.001
Md. R. U. Ahsan5
Estimated H-index: 5
(Tennessee Technological University),
Xuesong Fan4
Estimated H-index: 4
(UT: University of Tennessee)
+ 5 AuthorsDuck Bong Kim11
Estimated H-index: 11
(Tennessee Technological University)
Abstract Bimetallic additively manufactured structures (BAMSs) can replace traditionally-fabricated functionally-graded-components through fusion welding processes and can eliminate locally-deteriorated mechanical properties arising from post-processing. The present work fabricates a BAMS by sequentially depositing the austenitic stainless-steel and Inconel625 using a gas-metal-arc-welding (GMAW)-based wire + arc additive manufacturing (WAAM) system. Elemental mapping shows a smooth compositional transition at the interface without any segregation. Both materials being the face-center-cubic (FCC) austenite, the electron backscattered diffraction (EBSD) analysis of the interface shows the smooth and cross-interface-crystallographic growth of long-elongated grains in the direction. The hardness values were within the range of 220 to 240 HV for both materials without a large deviation at the interface. Due to the controlled thermal history, mechanical testing yielded a consistent result with the ultimate tensile strength and elongation of 600 MPa and 40%, respectively, with the failure location on the stainless-steel side. This study demonstrates that WAAM has the potential to fabricate BAMS with controlled properties.
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