Heat-treatment effects on a bimetallic additively-manufactured structure (BAMS) of the low-carbon steel and austenitic-stainless steel

Published on Mar 1, 2020in Additive manufacturing7.002
· DOI :10.1016/J.ADDMA.2020.101036
Md. R. U. Ahsan5
Estimated H-index: 5
(Tennessee Technological University),
A. N. M. Tanvir4
Estimated H-index: 4
(Tennessee Technological University)
+ 7 AuthorsDuck Bong Kim11
Estimated H-index: 11
(Tennessee Technological University)
Sources
Abstract
Abstract A bimetallic additively-manufactured structure (BAMS) is a type of functionally-graded multi-material structure used for achieving different complementary material properties within the same structure as well as cost optimization. Wire + arc additive manufacturing (WAAM) offers the capability to fabricate the BAMS in a simultaneous or sequential way. To fully utilize the benefits of the BAMS, the interfacial joint should be strong, and each of the constituents should have reasonable mechanical integrity. For this, a BAMS of low-carbon steel and austenitic-stainless steel was fabricated using a gas-metal-arc-welding (GMAW)-based WAAM process. Then, the BAMS was heat-treated at a range of 800 °C to 1,100 °C and 30 minutes to 2 hours. This resulted in 35% and 250% increases in the ultimate tensile strength and elongation, compared to the as-deposited BAMS. After the heat-treatment, the failure location moved from the low-carbon-steel to the stainless-steel side. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDAx), and the Vickers hardness test were used to characterize the BAMS. In this paper, it is experimentally validated that heat-treatment at 950 °C-1 hour is the near-optimal condition for the BAMS.
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