Inconel-steel multilayers by liquid dispersed metal powder bed fusion: Microstructure, residual stress and property gradients

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU140117" target="_blank" >RIV/00216305:26620/20:PU140117 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.addma.2019.101027" target="_blank" >https://doi.org/10.1016/j.addma.2019.101027</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.addma.2019.101027" target="_blank" >10.1016/j.addma.2019.101027</a>

Result language

angličtina

Original language name

Inconel-steel multilayers by liquid dispersed metal powder bed fusion: Microstructure, residual stress and property gradients

Original language description

Synthesis of multi-metal hybrid structures with narrow heat affected zones, limited residual stresses and secondary phase occurrence represents a serious scientific and technological challenge. In this work, liquid dispersed metal powder bed fusion was used to additively manufacture a multilayered structure based on alternating Inconel 625 alloy (IN625) and 316L stainless steel (316L) layers on a 316L base plate. Analytical scanning and transmission electron microscopies, high-energy synchrotron X-ray diffraction and nanoindentation analysis reveal sharp compositional, structural and microstructural boundaries between alternating 60 mu m thick alloys' subregions and unique microstructures at macro-, micro- and nano-scales. The periodic occurrence of IN625 and 316L sub-regions is correlated with a cross-sectional hardness increase and decrease and compressive stress decrease and increase, respectively. The laser scanning strategy induced a growth of elongated grains separated by zig-zag low-angle grain boundaries, which correlate with the occurrence of zig-zag cracks propagating in the growth direction. A sharp < 110 > fiber texture within the 316L regions turns gradually into a < 100 > fiber texture in the IN625 regions. The occurrence of the C-like stress gradient with a pronounced surface tensile stress of about 500 MPa is interpreted by the temperature gradient mechanism model. Chemical analysis indicates a formation of reinforcing spherical chromium-metal-oxide nano-dispersoids and demonstrates a possibility for reactive additive manufacturing and microstructural design at the nanoscale, as a remarkable attribute of the deposition process. Finally, the study shows that the novel approach represents an effective tool to combine dissimilar metallic alloys into unique bionic hierarchical microstructures with possible synergetic properties.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

20501 - Materials engineering

Project

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Continuities

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Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Additive Manufacturing

ISSN

2214-8604

e-ISSN

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Volume of the periodical

32

Issue of the periodical within the volume

1

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

12

Pages from-to

„101027-1“-„101027-12“

UT code for WoS article

000522928600053

EID of the result in the Scopus database

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