Experimental conditions and environment effects on thermal fatigue damage accumulation and life of die-casting steel X38CrMoV5 (AISI H11)

Farid Medjedoub 1 Gilles Dour 1 Sabine Le Roux 1 Pascal Lamesle 1 Mehdi Salem 1 Patrick Hairy 2 Farhad Rezai-Aria 1
1 CROMeP - Centre de Recherche Outillages, Matériaux et Procédés
2 CTIF - Centre Technique des Industries de la Fonderie
Abstract : Thermal Fatigue (TF) is a life-limiting factor in die-casting dies. The effect of the maximum temperature of thermal cycle, Tmax, and the heating (or heat flux density) of thermal fatigue (X38CrMoV5 AISI H11) at 47 HRC is investigated. Two microscopic and macroscopic heat-checking cells are identified. The microscopic heat checking is limited to the double-layer oxide scales formed on the external surface of TF specimens. An engineering Paris-type law using Kmax, can describe TF surface crack propagation of all tests examined. TF life based on σmax is used to rationalise TF micro- and macroscopic cracking.
Keywords : dies Thermal Fatigue fatigue-oxidation interaction fatigue chromium steels crack initiation TF crack and initiation die casting steel fatigue damage accumulation
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Farid Medjedoub, Gilles Dour, Sabine Le Roux, Pascal Lamesle, Mehdi Salem, et al.. Experimental conditions and environment effects on thermal fatigue damage accumulation and life of die-casting steel X38CrMoV5 (AISI H11). International Journal of Microstructure and Materials Properties, Inderscience, 2008, 3 (2/3), pp.336-349. ⟨10.1504/IJMMP.2008.018739⟩. ⟨hal-01685075⟩

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