Effect of Compositional Variation Induced by EBM Processing on Deformation Behavior and Phase Stability of Austenitic Cr-Mn-Ni TRIP Steel

Electron beam melting (EBM) is an established powder bed-based additive manufacturing process for the fabrication of complex-shaped metallic components. For metastable austenitic Cr-Mn-Ni TRIP steel, the formation of a homogeneous fine-grained microstructure and outstanding damage tolerance have bee...

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Bibliographic Details
Published in:JOM (1989) 2020-03, Vol.72 (3), p.1052-1064
Main Authors: Günther, J., Lehnert, R., Wagner, R., Burkhardt, C., Wendler, M., Volkova, O., Biermann, H., Niendorf, T.
Format: Article
Language:English
Subjects:
Additive manufacturing
Alloys
Anisotropy
Austenitic stainless steels
Chemistry/Food Science
Chromium
Crack initiation
Damage tolerance
Defects
Deformation
Deformation effects
Deformation mechanisms
Earth Sciences
Electron beam melting
Energy
Engineering
Environment
Kinetics
Manganese
Martensite
Mechanical properties
Metal fatigue
Microstructure
Nickel
Organic chemistry
Phase stability
Physics
Powder beds
Process parameters
Steel
Strain hardening
The 2nd Asia-Pacific International Conference on Additive Manufacturing (APICAM 2019)
TRIP steels
Ultimate tensile strength
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Summary:Electron beam melting (EBM) is an established powder bed-based additive manufacturing process for the fabrication of complex-shaped metallic components. For metastable austenitic Cr-Mn-Ni TRIP steel, the formation of a homogeneous fine-grained microstructure and outstanding damage tolerance have been reported. However, depending on the process parameters, a certain fraction of Mn evaporates. This can have a significant impact on deformation mechanisms as well as kinetics, as was previously shown for as-cast material. Production of chemically graded and, thus, mechanically tailored parts can allow for further advances in terms of freedom of design. The current study presents results on the characterization of the deformation and strain-hardening behavior of chemically tailored Cr-Mn-Ni TRIP steel processed by EBM. Specimens were manufactured with distinct scan strategies, resulting in varying Mn contents, and subsequently tensile tested. Microstructure evolution has been thoroughly examined. Starting from one initial powder, an appropriate scan strategy can be applied to purposefully evaporate Mn and, therefore, adjust strain hardening as well as martensite formation kinetics and ultimate tensile strength.
ISSN:1047-4838
1543-1851
DOI:10.1007/s11837-020-04018-6