Effect of aluminizing and oxidation on the thermal fatigue damage of hot work tool steels for high pressure die casting applications

Abstract : The interaction between thermal fatigue and aluminizing and/or oxidation is investigated using an experimental approach based on decoupling of mechanisms. Virgin and pre-aluminized steel specimens are tested in air and nitrogen between 100 and 650 °C. Homogeneous uniaxial micro-crack network forms on the oxidised or pre-aluminized surface in air, with a better resistance to micro-cracking for the intermetallic coating. The propagation of the micro-cracks is delayed in nitrogen, whilst no evidence of micro-cracking is observed on the virgin specimen. The premature cracking of the steel depends on the formation of the superficial micro-crack network, and the crack propagation is assisted by oxidation.
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https://hal-mines-albi.archives-ouvertes.fr/hal-01898697
Contributeur : Mines Albi Ecole Nationale Supérieure Des Mines d'Albi-Carmaux <>
Soumis le : jeudi 18 octobre 2018 - 16:46:14
Dernière modification le : samedi 27 octobre 2018 - 01:26:57

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Mehdi Salem, Sabine Le Roux, Gilles Dour, Pascal Lamesle, Karim Choquet, et al.. Effect of aluminizing and oxidation on the thermal fatigue damage of hot work tool steels for high pressure die casting applications. International Journal of Fatigue, Elsevier, 2019, 119, p.126-138. 〈https://www.sciencedirect.com/science/article/pii/S0142112318305632〉. 〈10.1016/j.ijfatigue.2018.09.018〉. 〈hal-01898697〉

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