Abstract
A low-carbon metastable austenitic CrMnNi cast steel was investigated under shock conditions in a flyer-plate impact test. The samples were impacted by aluminum flyer-plates with impact velocities of 620 ± 30 m/s. Depending on deformation temperature and strain rate, the material exhibited different deformation mechanisms (dislocation glide, martensitic transformation, and mechanical twinning), which determined the microstructural evolution and mechanical behavior. Flyer-plate impact tests were carried out at 213 K and 293 K (−60 °C and +20 °C). A soft recovered sample revealed microstructural changes directly after impact. The subsequent microstructural investigations via light-optical microscopy and scanning electron microscopy revealed that transformation-induced plasticity (TRIP effect) was the primary deformation mechanism. Moreover, it was possible to quantify the martensite volume fraction by different methods and to identify the hcp ε-martensite phase as an intermediate transformation stage. A decrease in temperature also increased the driving force for the martensitic transformation.
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Acknowledgments
This work was supported by the German Research Foundation or Deutsche Forschungsgemeinschaft (DFG), and was created as part of the Collaborative Research Center TRIP-Matrix-Composites (SFB 799, subproject B2). The authors would like to thank Ms K. Zuber for carrying out the metallographic preparation. Special thanks also go to Dr. D. Ehinger for his help in conducting the EBSD measurements.
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Manuscript submitted July 31, 2014.
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Eckner, R., Reichel, B., Savinykh, A.S. et al. Microstructure of CrMnNi Cast Steel After Explosive-Driven Flyer-Plate Impact at Room Temperature and Below. Metall Mater Trans A 47, 75–83 (2016). https://doi.org/10.1007/s11661-015-3222-8
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DOI: https://doi.org/10.1007/s11661-015-3222-8