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Thermodynamic behavior of Fe-Mn and Fe-Mn-Ag powder mixtures during selective laser melting
ID Kraner, Jakob (Author), ID Medved, Jože (Author), ID Godec, Matjaž (Author), ID Paulin, Irena (Author)

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Abstract
Additive manufacturing is a form of powder metallurgy, which means the properties of the initial metal powders (chemical composition, powder morphology and size) impact the final properties of the resulting parts. A complete characterization, including thermodynamic effects and the behavior of the metal powders at elevated temperatures, is crucial when planning the manufacturing process. The analysis of the Fe-Mn and Fe-Mn-Ag powder mixtures, made from pure elemental powders, shows a high susceptibility to sintering in the temperature interval from 700 to 1000 °C. Here, numerous changes to the manganese oxides and the αMn to βMn transformation occurred. The problems of mechanically mixed powders, when using selective laser melting, were highlighted by the low flowability, which led to a less controllable process, an uncontrolled arrangement of the powder and a large percentage of burnt manganese. All this was determined from the altered chemical compositions of the produced parts. The impact of the increased manganese content on the decreased probability of the transformation from γ-austenite to ε-martensite was confirmed. The ε-martensite in the microstructure increased the hardness of the material, but at the same time, its magnetic properties reduce the usefulness for medical applications. However, the produced parts had comparable elongations to human bone.

Language:English
Keywords:FeMn alloys, powder metallurgy, differential scanning calorimetry, selective laser melting, ε-martensite
Work type:Article (dk_c)
Typology:1.01 - Original Scientific Article
Organization:NTF - Faculty of Natural Sciences and Engineering
Year:2021
Publication status in journal:Published
Article version:Publisher's version of article
Number of pages:11 str.
Numbering:Vol. 11, iss. 2, art. 234
UDC:620.1/.2
ISSN on article:2075-4701
DOI:10.3390/met11020234 This link opens in a new window
COBISS.SI-ID:49402627 This link opens in a new window
Publication date in RUL:10.02.2022
Views:182
Downloads:45
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Record is a part of a journal

Title:Metals
Shortened title:Metals
Publisher:MDPI
ISSN:2075-4701
COBISS.SI-ID:15976214 This link opens in a new window

Licences

License:CC BY 4.0, Creative Commons Attribution 4.0 International
Link:http://creativecommons.org/licenses/by/4.0/
Description:This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.
Licensing start date:01.02.2021

Document is financed by a project

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project number:J2-1729
Name:Nova biorazgradljiva Fe-Mn zlitina izdelana s konvencionalnim postopkom in s postopkom dodajnih tehnologij s prilagojeno biorazgradljivostjo

Funder:ARRS - Agencija za raziskovalno dejavnost Republike Slovenije (ARRS)
Project number:P2-0132
Name:Fizika in kemija površin kovinskih materialov

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