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Title:Improving the surface properties of additive-manufactured Inconel 625 by plasma nitriding
Authors:ID Skobir Balantič, Danijela Anica (Author)
ID Donik, Črtomir (Author)
ID Podgornik, Bojan (Author)
ID Kocijan, Aleksandra (Author)
ID Godec, Matjaž (Author)
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MD5: B1A7FFCC336D1533A5BD70463637D21D
 
URL URL - Source URL, visit https://www.sciencedirect.com/science/article/pii/S0257897222010519?via%3Dihub
 
Language:English
Typology:1.01 - Original Scientific Article
Organization:Logo IMT - Institute of Metals and Technology
Abstract:As a surface-hardening technique, plasma nitriding is a common procedure for improving the properties of conventional Ni-based alloys. The diffusion of nitrogen hardens a layer on the surface of the alloy, leading to better wear resistance and a higher coefficient of friction, as well as a higher surface hardness. This study reports the effect of plasma nitriding on additive-manufactured (AM) Inconel 625 (IN625) compared to its conventional manufactured and nitrided counterparts. The samples produced with the laser powder-bed fusion (LPBF) process were subsequently plasma nitrided in the as-built condition, stress-relief annealed at 870 °C and solution treated at 1050 °C. The plasma nitridings were carried out at 430 °C and 500 °C for 15 h. The growth kinetics of the nitride layer of the AM samples depends on the prior heat treatments and is faster in the as-built state due to the specific cellular structure. The lower nitriding temperature leads to the formation of expanded austenite in the nitride layer, while at the higher nitriding temperature, the expanded austenite decomposes and CrN precipitation occurs. The XRD and SEM analyses confirmed the presence of two layers: the surface layer and the diffusion layer beneath. The lower nitriding temperature caused the formation of expanded austenite or a combination of expanded austenite and CrN. The higher nitriding temperature led to the decomposition of the expanded austenite and to the formation/precipitation of CrN. The higher nitriding temperature also decreased the corrosion resistance slightly due to the increased number of precipitated Cr-nitrides. On the other hand, the wear resistance was significantly improved after plasma nitriding and was much less influenced by the nitriding temperature.
Keywords:additive manufacturing, powder-bed fusion, plasma nitriding, expanded austenite, wear and corrosion resistance, Ni-based alloy
Publication status:Published
Publication version:Version of Record
Publication date:07.12.2022
Publisher:Elsevier
Year of publishing:2023
Number of pages:str. 1-11
Numbering:Vol. 452, [article no.] ǂ129130
Source:Nizozemska
PID:20.500.12556/DiRROS-18036 New window
UDC:621.8:539
ISSN on article:0257-8972
DOI:10.1016/j.surfcoat.2022.129130 New window
COBISS.SI-ID:133032451 New window
Copyright:© 2022 The Authors. Published by Elsevier B.V.
Publication date in DiRROS:31.01.2024
Views:868
Downloads:337
Metadata:XML DC-XML DC-RDF
:
SKOBIR BALANTIČ, Danijela Anica, DONIK, Črtomir, PODGORNIK, Bojan, KOCIJAN, Aleksandra and GODEC, Matjaž, 2023, Improving the surface properties of additive-manufactured Inconel 625 by plasma nitriding. Surface & coatings technology [online]. 2023. Vol. 452, no. 129130, p. 1–11. [Accessed 18 March 2025]. DOI 10.1016/j.surfcoat.2022.129130. Retrieved from: https://dirros.openscience.si/IzpisGradiva.php?lang=eng&id=18036
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Record is a part of a journal

Title:Surface & coatings technology
Shortened title:Surf. coat. technol.
Publisher:Elsevier Sequoia
ISSN:0257-8972
COBISS.SI-ID:3084815 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:L2-2613
Name:Novi kompozitni materiali s kovinsko matrico, ojačano z nanodelci ter izdelani s selektivnim laserskim taljenjem za aplikacije v orodjarstvu
Funder:ARRS - Slovenian Research Agency
Project number:P2-0132
Name:Fizika in kemija površin kovinskih materialov
Funder:ARRS - Slovenian Research Agency
Project number:P2-0050
Name:Kovinski materiali in tehnologije

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License:CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
Link:http://creativecommons.org/licenses/by-nc-nd/4.0/
Description:The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.
Licensing start date:07.12.2022
Applies to:Text and Data Mining valid from 2023-01-01 Version of Record valid from 2022-12-07

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