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Title:Fine martensite and beta-grain variational effects on mechanical properties of Ti–6Al–4V while laser parameters change in laser powder bed fusion
Authors:ID Pal, Snehashis (Author)
ID Bončina, Tonica (Author)
ID Lojen, Gorazd (Author)
ID Brajlih, Tomaž (Author)
ID Švara Fabjan, Erika (Author)
ID Gubeljak, Nenad (Author)
ID Finšgar, Matjaž (Author)
ID Drstvenšek, Igor (Author)
Files:.pdf 1-s2.0-S0921509323014764-main.pdf (17,10 MB)
MD5: 01A6674A082542078237C4D79215303B
 
Language:English
Work type:Unknown
Typology:1.01 - Original Scientific Article
Organization:FS - Faculty of Mechanical Engineering
Keywords:martensite, Ti-6Al-4V, microstructure, tensile strenght, selective laser melting
Submitted for review:12.11.2023
Article acceptance date:23.12.2023
Publication date:25.12.2023
Publisher:Elsevier
Year of publishing:2024
Number of pages:11 str.
Numbering:Vol. 892
PID:20.500.12556/DKUM-86890 New window
UDC:621.78:669.15
ISSN on article:0921-5093
COBISS.SI-ID:179963395 New window
DOI:10.1016/j.msea.2023.146052 New window
Copyright:© 2023 The Authors
Publication date in DKUM:26.01.2024
Views:285
Downloads:22
Metadata:XML DC-XML DC-RDF
Categories:Misc.
:
PAL, Snehashis, BONČINA, Tonica, LOJEN, Gorazd, BRAJLIH, Tomaž, ŠVARA FABJAN, Erika, GUBELJAK, Nenad, FINŠGAR, Matjaž and DRSTVENŠEK, Igor, 2024, Fine martensite and beta-grain variational effects on mechanical properties of Ti–6Al–4V while laser parameters change in laser powder bed fusion. Materials Science & Engineering. Structural materials: Properties, Microstructure and Processing [online]. 2024. Vol. 892. [Accessed 18 March 2025]. DOI 10.1016/j.msea.2023.146052. Retrieved from: https://dk.um.si/IzpisGradiva.php?lang=eng&id=86890
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Record is a part of a journal

Title:Materials Science & Engineering. Structural materials: Properties, Microstructure and Processing
Shortened title:Mater. sci. eng., A Struct. mater. : prop. microstruct. process.
Publisher:Elsevier
ISSN:0921-5093
COBISS.SI-ID:25908992 New window

Document is financed by a project

Funder:ARRS - Slovenian Research Agency
Project number:P2-0118
Name:Tekstilna kemija in napredni tekstilni materiali
Funder:ARRS - Slovenian Research Agency
Project number:P2-0137
Name:Numerična in eksperimentalna analiza nelinearnih mehanskih sistemov
Funder:ARRS - Slovenian Research Agency
Project number:P2-0157
Name:Tehnološki sistemi za pametno proizvodnjo
Funder:ARRS - Slovenian Research Agency
Project number:P2-0120
Name:Tehnologije metastabilnih materialov
Funder:ARRS - Slovenian Research Agency
Project number:J1-2470
Name:Biofunkcionalizacija 3D-tiskanih kovinskih zlitin kot novo nastajajoča strategija za zmanjšanje neželenih učinkov ortopedskih vsadkov
Funder:ARRS - Slovenian Research Agency
Project number:I0-0029
Name:Infrastrukturna dejavnost Univerze v Mariboru

Secondary language

Language:Slovenian
Abstract:In this study, several variations of Ti–6Al–4V β-grains and α′-martensites were observed while changing the combinations of laser parameters and keeping the energy density (ED) constant in the laser powder bed fusion (LPBF) process. Several combinations of laser power, scanning speed, and hatch spacing were considered, resulting in high product density between 99.3% and 100.0%. Accordingly, tensile specimens were fabricated to observe the above strategic fabrication and microstructural effects on tensile properties. At the same time, microhardness was also measured to observe the similarities. However, the size and shape of the β-grains differed significantly, while the scanning speed gradually decreased along with the laser power, with the shape changing from irregular to classically hexagonal and the size increasing sharply. Using the results of differential thermal analysis (DTA), it can be said that most of the tertiary and quaternary α′-martensites formed after the following few thermal cycles below 370 °C. Similarly, the α′-particles decomposed and formed β-particles due to thermal treatment at 370 °C. Therefore, a denser and higher number of tertiary and quaternary α′-martensites and a lower number of primary and secondary α′-martensites occurred, while the cooling rate decreased and the number of thermal cycles increased due to a lower scanning speed. These phenomena increased the hardness 370–395 HV and deteriorated the yield strength 1250-840 MPa. Changes in track overlap (hatch spacing) of 30–50% affect mechanical and microstructural characteristics more than track overlap of 10–25%. The columnar β-grains became longer and wider as the lane overlap increased from 30 to 50%. At the same time, some β-grains also changed to contain finer and fewer α′-martensites. These factors reduced both hardness and tensile properties.
Keywords:mikrostrukture, trdota, laserji


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