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Effect of heat treatment on the microstructure and mechanical properties of 18Ni-300 maraging steel produced by additive–subtractive hybrid manufacturing

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DOITrouver le DOI : https://doi.org/10.3390/ma16134749
AuteurRechercher : 1; Rechercher : 1Identifiant ORCID : https://orcid.org/0000-0003-2900-6249; Rechercher : 1Identifiant ORCID : https://orcid.org/0000-0001-7662-984X; Rechercher : 2Identifiant ORCID : https://orcid.org/0000-0001-5729-8045; Rechercher : 1Identifiant ORCID : https://orcid.org/0000-0001-5017-9596; Rechercher : ; Rechercher : 2; Rechercher : ; Rechercher :
Affiliation
  1. Conseil national de recherches Canada. Aérospatiale
  2. Conseil national de recherches Canada. Automobile et les transports de surface
Bailleur de fondsRechercher : National Research Council Canada. METALTec industrial research group; Rechercher : Natural Sciences and Engineering Research Council of Canada; Rechercher : Centre Quebecois de recherche et de developpement de l’aluminium
FormatTexte, Article
Sujetadditive–subtractive; hybrid manufacturing; 18Ni-300 maraging steel; heat treatment; mechanical properties; microstructure; X-ray micro-computed micrography; micropore analysis
Résumé
The present work investigates the effectiveness of two heat treatment cycles—solution treatment + aging (STA) and direct aging (DA)—on optimizing the microstructure and enhancing the mechanical properties of 18Ni-300 maraging steel (300 MS) produced by additive–subtractive hybrid manufacturing (ASHM). The STA treatment led to a fully martensitic microstructure with minor remnants of the cellular substructures associated with the solidification conditions in ASHM. DA resulted in some reverted austenite and partial dissolution of the cellular morphologies into shorter fragments. Despite the contrasting microstructures, the tensile strength and the macro- and micro-hardness were comparable between STA and DA conditions. By contrast, the potential for improving the ductility was higher with the DA heat treatment. This is attributed to the higher reverted austenite content in the samples treated by DA, i.e., up to a maximum of 13.4% compared to less than 3.0% in the STA samples. For the DA sample with the highest reverted austenite content of 13.4%, the highest local and global fracture strain values of 30.1 and 5.9 ± 0.6% were measured, while the respective values were 23.4 and 4.4 ± 0.1% for the corresponding STA sample. This work suggests that DA of 300 MS produced by ASHM is sufficient to achieve comparable hardness and tensile strength to STA, whilst maintaining reasonable ductility. Avoiding the solution treatment cycle, with its appreciably higher temperatures, could benefit the dimensional stability and surface quality that are important for ASHM of 300 MS parts.
Date de publication
Maison d’éditionMDPI
Licence
Dans
  • Materials 16, nº 13, 4749 (30 juin 2023).
Langueanglais
Publications évaluées par des pairsOui
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Identificateur de l’enregistrement03c65dcb-9e47-4dd3-b744-9f9e8f4655db
Enregistrement créé2024-06-03
Enregistrement modifié2025-11-03

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