Effect of remelting on the anisotropic corrosion behavior of IN718 fabricated by laser powder bed fusion
Source abstract
Abstract
Anisotropy in laser powder bed fusion (LPBF) alloys significantly impacts their performance, but its role in corrosion is not fully understood. This work investigates how a remelting strategy modifies the microstructure and corrosion behavior of LPBFed IN718. In as-built samples, melt track boundaries (MTBs) exhibited slight Nb segregation and relatively high dislocation density, acting as primary sites for pitting corrosion in a 3.5 wt% NaCl solution. Remelting redistributed these Nb-rich phases but increased the overall dislocation density. Consequently, while remelting reduced the corrosion anisotropy by altering the melt track structure, it simultaneously degraded the overall corrosion resistance by compromising passive film stability. This study reveals a critical trade-off between improving microstructural homogeneity and maintaining corrosion performance, offering key guidance for the use of LPBF-IN718 in demanding environments.
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Research context
OpenAlex topics: Additive Manufacturing Materials and Processes · High Entropy Alloys Studies · Additive Manufacturing and 3D Printing Technologies
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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