Hot-work tool steels are usually the selected materials for high-load and high- temperature applications such as forging, casting and extrusion dies. In this framework, each cast/forged part or each extruded billet represents for the tool a mechanical load cycle, thus leading to the fatigue-working regime. In addition, the high thermal loads are also involved for the creep phenomenon that synergistically and detrimentally act with fatigue, reducing the tool lifetime. In the present work, three hot-work tool steels commonly used to manufacture extrusion dies have been selected and compared in terms of dynamic performance under the creep-fatigue regime. An innovative experimental setup was used to test the steels by means of specimens that replicate the mandrel of a porthole die on a small scale. The H11 and the H13 have been compared at different levels of temperature and load by evaluating the specimen deflection over time, clearly highlighting the relative optimal working windows. An analytical model developed by the authors was also used to predict the H11 specimen lifetime at further load/temperature levels in order to perform a comparison with previous performed experiments on the super clean hot-work tool steel TQ1.

Barbara Reggiani, L.D. (2022). Comparing Hot-Work Tool Steels for Extrusion Die Performance. Wauconda : Aluminum Extruders Council.

Comparing Hot-Work Tool Steels for Extrusion Die Performance

Lorenzo Donati;Luca Tomesani
2022

Abstract

Hot-work tool steels are usually the selected materials for high-load and high- temperature applications such as forging, casting and extrusion dies. In this framework, each cast/forged part or each extruded billet represents for the tool a mechanical load cycle, thus leading to the fatigue-working regime. In addition, the high thermal loads are also involved for the creep phenomenon that synergistically and detrimentally act with fatigue, reducing the tool lifetime. In the present work, three hot-work tool steels commonly used to manufacture extrusion dies have been selected and compared in terms of dynamic performance under the creep-fatigue regime. An innovative experimental setup was used to test the steels by means of specimens that replicate the mandrel of a porthole die on a small scale. The H11 and the H13 have been compared at different levels of temperature and load by evaluating the specimen deflection over time, clearly highlighting the relative optimal working windows. An analytical model developed by the authors was also used to predict the H11 specimen lifetime at further load/temperature levels in order to perform a comparison with previous performed experiments on the super clean hot-work tool steel TQ1.
2022
Proceedings of the twelfth International Aluminum Extrusion Technology Seminar & Exposition
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Barbara Reggiani, L.D. (2022). Comparing Hot-Work Tool Steels for Extrusion Die Performance. Wauconda : Aluminum Extruders Council.
Barbara Reggiani, Lorenzo Donati, Mehdi Ben Tahar, Luca Tomesani
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/907351
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