Abstract
This study investigates the in situ alloying of a Ni-based superalloy processed by means of laser powder bed fusion (LPBF). For this purpose, Inconel 625 powder is mixed with 1 wt.% of Ti6Al4V powder. The modified alloy is characterized by densification levels similar to the base alloy, with relative density superior to 99.8%. The material exhibits Ti-rich segregations along the melt pool contours. Moreover, Ti tends to be entrapped in the interdendritic areas during solidification in the as-built state. After heat treatments, the modified Inconel 625 version presents greater hardness and tensile strengths than the base alloy in the same heat-treated conditions. For the solution annealed state, this is mainly attributed to the elimination of the segregations into the interdendritic structures, thus triggering solute strengthening. Finally, for the aged state, the further increment of mechanical properties can be attributed to a more intense formation of phases than the base alloy, due to elevated precipitation strengthening ability under heat treatments. It is interesting to note how slight chemical composition modification can directly develop new alloys by the LPBF process.
Highlights
Additive manufacturing (AM) processes have been rapidly growing due to the potential to create complex near-shape components through a layer-by-layer process [1,2,3]
In proposing a strategy to develop new alloys tailored for AM, the current study focuses on the in situ alloying for the chemical modification of a Ni-based superalloy, commonly known as Inconel 625 (IN625), using the laser powder bed fusion (LPBF) process
The current study aims to show the potential of the alloy development by means of the in situ alloying to create a modified IN625 alloy utilizing LPBF
Summary
Additive manufacturing (AM) processes have been rapidly growing due to the potential to create complex near-shape components through a layer-by-layer process [1,2,3]. Wang et al [21] reported that IN625 with 0.5 wt.% of carbon nanotube exhibited higher tensile strengths and lower ductility than the base alloy All these studies imply a particular interest in enhancing the mechanical properties of IN625 alloy for possible industrial applications. Higher Ti content with respect to IN625 alloy leads to the activation of a more prominent formation of phases during aging treatments These alloys are the perfect candidates for working in the oil and gas, marine, and chemical processing industries due to corrosive resistance similar to IN625 combined with superior tensile strengths [9,24,25,26,27]. In order to highlight the potential of this approach, the microstructure and mechanical properties of the modified IN625 were compared t3oofth17e standard IN625, taking into account the presence of residual Ti-rich segregations
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