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Thixoforging of particle-reinforced steel materials

Autoren:Behrens, B.-A.; Frischkorn, C.
Kategorie:Zeitschriften/Aufsätze (reviewed)
Jahr:2014
Veröffentlichung:Production Engineering
DOI:10.1007/s11740-014-0533-3

Abstract

The paper deals with a new process chain consisting of powder metallurgy (PM) and a subsequent thixoforging process. This innovative production process can increase the complexity of PM components and enable a high formability of brittle materials such as metal matrix composites (MMC). Compared to conventional materials MMCs feature improved mechanical properties and thus a high potential for various applications. In this investigation cylindrical raw parts, consisting of a steel powder and different proportions of titanium carbide particles, were produced by uniaxial powder pressing and sintering. Subsequently, the samples were heated up to the thixotropic (semi-solid) temperature range and valve parts were thixoforged by a backwards rod extrusion process. Finally, the particle-reinforced steel parts were characterised by metallographic analysis and hardness measurements.