Corrosion and Metallurgical Behavior of Wire Arc Additively Manufactured Functionally Graded Superduplex Stainless Steel/Inconel 625
Source abstract
Abstract
Robotic cold metal transfer process was used for fabrication of wire arc additively manufactured (WAAM) wall involving a bimetallic combination of superduplex stainless steel (SDSS) and Inconel 625. A post-weld thermal aging treatment of 800 °C/2 h/water quenched was used to induce precipitation in the weld specimens. Aging resulted in the formation of intermetallics and carbides in the welds that caused their dendritic regions to be depleted in Cr, Ni and Fe, and enriched in C, as compared their respective matrix regions. X-ray photoelectron spectroscopy (XPS) studies on the passive layers show that the highest levels of Cr and Ni concentration were observed for SDSS and Inconel 625, respectively. Cyclic potentiodynamic polarization (CPP) testing results show that in the as-welded condition, bimetallic SDSS/In625 combination welds showed the highest pitting resistance followed by SDSS and Inconel 625. However, thermal aging degraded the pitting resistance of SDSS/In625 the most, followed by SDSS and Inconel 625. Tafel scan studies further show that in the as-welded condition, Inconel 625 exhibited better corrosion resistance than SDSS as well as SDSS/In625, but in the aged condition, bimetallic SDSS/In625 combination exhibited the highest corrosion resistance followed by SDSS and Inconel 625. This study shows that additive layers of Inconel 625 into WAAM fabricated SDSS structures can significantly improve their metallurgical and corrosion performance.
Source: expertdata · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · Welding Techniques and Residual Stresses · Hydrogen embrittlement and corrosion behaviors in metals
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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