Hot‐rolling of austenite and cold‐rolling of martensite were combined with aging treatments to obtain new microstructures in a maraging steel with a high Mo‐content.
Purpose of the investigation is to acquire an optimum combination of ultra high yield stress (σr>3000 MPa) and ductility (or toughness). The best results were obtained by treatments consisting of high amounts of plastic deformation between 1000°C and 600°C (ausforming) and aging of the martensite which had formed from the deformed austenite. Ausaging around 550°C induced pronounced intercrystalline embrittlement. Intercritical heat treatment at 700°C provide considerable ductility (uniform elongation) however, insufficient strength (<2000 MPa).
The most favourable thermo‐mechanical treatments are discussed in context with fabrication methods for the investigated steel.
An Schüttungen von Festkörpern (Koks und Erz) verschiedener Form und Stückgröße sowie an Mischungen aus den Komponenten wurden bei Durchströmungsversuchen Druckverlustkurven aufgenommen und die Widerstandsbeiwerte der Schüttungen nach bekannten Beziehungen berechnet. Aus den Ergebnissen wurden unter Berücksichtigung der verschiedenen Rohdichten der Einsatzstoffe Folgerungen für den praktischen Betrieb von Festbett‐Reaktoren, hier speziell dem Hochofen, gezogen.
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