Thermodynamic behavior of Fe-Mn and Fe-Mn-Ag powder mixtures during selective laser melting
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.
2021
2022-02-10 14:29:18
1033
FeMn alloys, powder metallurgy, differential scanning calorimetry, selective laser melting, ε-martensite
dk_c
Jakob
Kraner
70
Jože
Medved
70
Matjaž
Godec
70
Irena
Paulin
70
UDK
4
620.1/.2
ISSN pri članku
9
2075-4701
DOI
15
10.3390/met11020234
COBISS_ID
3
49402627
RAZ_Kraner_Jakob_2021.pdf
6247174
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2022-02-10 14:29:20