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Open AccessArticle

Microstructure and Deformation Response of TRIP-Steel Syntactic Foams to Quasi-Static and Dynamic Compressive Loads

1
Leibniz Institute for Solid State and Materials Research IFW Dresden, Institute for Complex Materials, Helmholtzstr, 20, D-01069 Dresden, Germany
2
Research Institute of Leather and Plastic Sheeting (FILK) gGmbH, Meißner Ring 1-5, D-09599 Freiberg, Germany
3
Fraunhofer Institute for Manufacturing Technology and Advanced Materials, Wiener Str. 12, D-28359 Bremen, Germany
4
Institute of Materials Engineering, Technische Universität Bergakademie Freiberg, Gustav-Zeuner-Str. 5, D-09599 Freiberg, Germany
*
Author to whom correspondence should be addressed.
Materials 2018, 11(5), 656; https://doi.org/10.3390/ma11050656
Received: 20 March 2018 / Revised: 18 April 2018 / Accepted: 19 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Advanced Materials for Transport Applications)
The implementation of hollow S60HS glass microspheres and Fillite 106 cenospheres in a martensitically transformable AISI 304L stainless steel matrix was realized by means of metal injection molding of feedstock with varying fractions of the filler material. The so-called TRIP-steel syntactic foams were studied with respect to their behavior under quasi-static compression and dynamic impact loading. The interplay between matrix material behavior and foam structure was discussed in relation to the findings of micro-structural investigations, electron back scatter diffraction EBSD phase analyses and magnetic measurements. During processing, the cenospheres remained relatively stable retaining their shape while the glass microspheres underwent disintegration associated with the formation of pre-cracked irregular inclusions. Consequently, the AISI 304L/Fillite 106 syntactic foams exhibited a higher compression stress level and energy absorption capability as compared to the S60HS-containing variants. The α -martensite kinetic of the steel matrix was significantly influenced by material composition, strain rate and arising deformation temperature. The highest ferromagnetic α -martensite phase fraction was detected for the AISI 304L/S60HS batches and the lowest for the TRIP-steel bulk material. Quasi-adiabatic sample heating, a gradual decrease in strain rate and an enhanced degree of damage controlled the mechanical deformation response of the studied syntactic foams under dynamic impact loading. View Full-Text
Keywords: syntactic foams; steel matrix; TRIP; martensite; high strain rate; quasi-adiabatic syntactic foams; steel matrix; TRIP; martensite; high strain rate; quasi-adiabatic
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MDPI and ACS Style

Ehinger, D.; Weise, J.; Baumeister, J.; Funk, A.; Waske, A.; Krüger, L.; Martin, U. Microstructure and Deformation Response of TRIP-Steel Syntactic Foams to Quasi-Static and Dynamic Compressive Loads. Materials 2018, 11, 656.

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