DataVXJournal of Materials Engineering and PerformancePaper
journal article·2022-02Open access

Study on the Austemperability of Thin-wall Ductile Cast Iron Produced by High-Pressure Die-casting

Frederic van gen Hassend, Lukas Ninnemann, Felix Töberich, Michael Breuckmann, Arne Röttger, Sebastian Weber

Journal of Materials Engineering and Performance· Volume 31· Issue 2
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Abstract

Abstract The production of thin-wall ductile iron (TWDI) by high-pressure die-casting (HPDC) is complex because of several metallurgical and microstructural challenges. The present work aims to evaluate the austemperability of components (4 mm thickness) produced by HPDC process. The graphitization kinetics, the pearlite formation during continuous cooling, and the effect of austempering on the evolution of the ausferritic microstructure were investigated using dilatometric tests, microstructural analysis as well as Vickers hardness tests and tensile tests. Results show that components exhibit a brittle behavior because of white structures, small shrinkage cavities, and microporosity in the as-cast condition. Graphitization at 1100 °C allows rapid formation of small graphite particles within a short time (40 s). The critical cooling time (t8/5) to avoid the formation of pearlite upon cooling was found to be 5 s at a martensite start temperature of 193 ± 14 °C. Austempering at 360 °C for 40 min results in an ausferritic microstructure with stable carbon-enriched austenite which provides a high hardness (355 ± 4 HV10) and tensile strength (Rm = 709 ± 65 MPa). The results represent main criteria regarding the producibility of die-casted TWDI, which are helpful for future alloy and heat treatment design.
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Research context

Metals & alloysMaterials processing

OpenAlex topics: Metal Alloys Wear and Properties · Microstructure and Mechanical Properties of Steels · Metallurgy and Material Forming

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

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