Abstract
In this study, varying powder particle size fractions (<25, 25 to 45, 45 to 63 µm) of a TRIP steel powder were compacted by spark plasma sintering (SPS). Densification initiated at a slightly lower temperature with decreasing particle size due to increasing green density. With decreasing powder particle size fraction, the as-sintered materials exhibited smaller grain sizes. Compression tests revealed a slight decrease of the compressive yield strength with increasing particle size and, accordingly, larger grain size. A few large deformation bands formed in bigger grains, while many thin deformation bands were formed in smaller grains. α′-Martensite nuclei formed successively inside the deformation bands, reducing the mean free path of (partial) dislocation slip. Due to the size of the deformation bands, α′-martensite formation started at lower strains with increasing particle size. When α′-martensite formation was initiated, work hardening was influenced more by α′-martensite formation than by the grain size of the steel matrix. Hence, work hardening increased with increasing particle size.
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Acknowledgments
The authors would like to thank the German Research Foundation (DFG) for supporting the investigations, which were part of the Collaborative Research Center TRIP Matrix Composites (SFB 799). For the production of the steel powder, the authors would like to thank the Institute of Iron and Steel Technology at the TU Bergakademie Freiberg. Furthermore, the authors thank the Institute of Ceramic, Glass and Construction Materials at the TU Bergakademie Freiberg for carrying out the measurements of the powder particle size distribution.
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Decker, S., Martin, S. & Krüger, L. Influence of Powder Particle Size on the Compaction Behavior and Mechanical Properties of a High-Alloy Austenitic CrMnNi TRIP Steel During Spark Plasma Sintering. Metall Mater Trans A 47, 170–177 (2016). https://doi.org/10.1007/s11661-015-2861-0
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DOI: https://doi.org/10.1007/s11661-015-2861-0