Microstructure and tribological response of selective laser melted AISI 316L stainless steel : the role of severe surface deformation

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Kumar, Vikesh and Joshi, Manoj D. and Pruncu, Catalin and Singh, Indrasen and Hosmani, Santosh S. (2021) Microstructure and tribological response of selective laser melted AISI 316L stainless steel : the role of severe surface deformation. Journal of Materials Engineering and Performance, 30 (7). pp. 5170-5183. ISSN 1059-9495 (https://doi.org/10.1007/s11665-021-05730-3)

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Abstract

This study investigates the effect of surface mechanical attrition treatment (SMAT) (a severe surface-deformation process) on microstructure and tribological behavior of AISI 316L steel samples manufactured using the selective laser melting (SLM) technique. The specimens are built in different directions (0°, 45°, and 90°). The microstructure of annealed SLM samples shows the non-uniform distribution and random orientation of grains. It contains high-angle grain boundaries and a high density of dislocations. The average grain size is about 63, 51, and 41 μm for 0°, 45°, and 90° build direction, respectively. SMAT is beneficial for SLM steel to reduce surface roughness (by ~ 87%) and eliminate internal porosity. The deformed layer of SLM steel shows a highly dense network of slip bands, distortion of grains, and hardness gradient (up to the depth of about 600 μm). Increase in surface hardness due to SMAT is maximum (~ 54%) for the sample having 90° build direction. Typical observation of deformation-induced martensite is absent for the SMAT-processed SLM steel. Under the higher load (especially, 20 N), the tribological response of sample manufactured in the 90° direction is superior amongst the non-treated samples. Severe surface deformation enhances the wear resistance and reduces the COF of SLM steel.

ORCID iDs

Kumar, Vikesh, Joshi, Manoj D., Pruncu, Catalin ORCID logoORCID: https://orcid.org/0000-0002-4926-2189, Singh, Indrasen and Hosmani, Santosh S.;
  • Item type:Article
    ID code:76072
    Dates:
    Date
    Event
    31 July 2021
    Published
    12 April 2021
    Published Online
    16 February 2021
    Accepted
    Notes:This is a post-peer-review, pre-copyedit version of an article published in Journal of Materials Engineering and Performance. The final version is available online at: https://doi.org/10.1007/s11665-021-05730-3.
    Subjects:Technology > Manufactures
    Department:Faculty of Engineering > Design, Manufacture and Engineering Management
    Depositing user: Pure Administrator
    Date deposited:13 Apr 2021 14:41
    Last modified:11 Nov 2024 13:02
    URI:https://strathprints.strath.ac.uk/id/eprint/76072
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