Experimental conditions and environment effects on thermal fatigue damage accumulation and life of die-casting steel X38CrMoV5 (AISI H11)
by Farid Medjedoub, Gilles Dour, Sabine Le Roux, Pascal Lamesle, Mehdi Salem, Patrick Hairy, Farhad Rezai-Aria
International Journal of Microstructure and Materials Properties (IJMMP), Vol. 3, No. 2/3, 2008

Abstract: Thermal Fatigue (TF) is a life-limiting factor in die-casting dies. The effect of the maximum temperature of thermal cycle, T_max, 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 K_max, can describe TF surface crack propagation of all tests examined. TF life based on σ_max is used to rationalise TF micro- and macroscopic cracking.

Online publication date: Mon, 16-Jun-2008

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