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Article Dans Une Revue Journal of Materials Science Année : 2023

Sliding wear resistance and residual stresses of parts repaired by laser metal deposition

Résumé

Large temperature gradients inherent to additive manufacturing (AM) processes induce large residual stress (RS) in the final part. Because RS can influence the tribological properties, this study focuses on the relationship between wear sliding properties and RS in IN718 coatings. Such coatings were deposited with a Laser Metal Deposition (LMD) machine using to two different scanning strategies. The wear resistance and RS state of two types of samples were investigated after surface milling. RS were measured before and after tests on a reciprocating sliding test apparatus. Two different X-ray diffraction techniques were employed to measure the surface and subsurface state RS: Laboratory Energy Dispersive X-ray Diffraction (LEDXD) and Synchrotron X-ray Energy Dispersive Diffraction (SXEDD). Due to the milling process, coatings show similar depth distributions of RS from 22 µm to 92 µm depth, but exhibit different magnitudes depending on the scanning strategy used. Reciprocating sliding wear tests induced high compressive residual stresses that erased the initial RS state. However, a similar wear behavior was observed in the two samples, which possess similar texture and microstructure. This demonstrates that the influence of RS on wear resistance is a second-order effect. Nevertheless, it was observed that RS can still impact the wear performance at the early testing stages of the repaired parts.
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Dates et versions

hal-04330509 , version 1 (08-12-2023)

Identifiants

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Théo Zurcher, Itziar Serrano-Munoz, Tatiana Mishurova, Guilherme Abreu Faria, Sebastian Degener, et al.. Sliding wear resistance and residual stresses of parts repaired by laser metal deposition. Journal of Materials Science, inPress, ⟨10.1007/s10853-023-09129-4⟩. ⟨hal-04330509⟩
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