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The suitability of a variety of different steel grades for semi‐solid processing was investigated by means of differential thermal analysis, quenching experiments, metallographic investigations, line scan technology and hardness measurements. Thixoforging trials with the promising steel grades 100Cr6 and HS6‐5‐3 were used to validate the suitability of both steel grades by manufacturing the structural component “damper bracket”. The microstructures of these steels during thixoforging differ significantly: The grade HS6‐5‐3 develops a homogeneous and fine globulitic grain distribution with mainly liquid phase at the grain boundaries; the grade 100Cr6 develops a coarse grained microstructure with high entrapped liquid contents beside the intergranular liquid. The experience with laboratory processed components can be summarized that either the production of geometrically complex components (homogenous, fine globulitic structure) or the production with a determined microstructure and property gradients (coarse‐grained structure) are possible.
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Püttgen et al. (2005) studied this question.
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