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Compréhension des mécanismes d'endommagement en surface des outils de forge à chaud : effets des lubrifiants

Abstract : The conditions of contact and friction encountered in hot forging generate important thermo mechanical stresses which induce various damaging modes on the tools. The principal objective of the thesis aims at quantifying the capacity of the lubricants to reduce or delay these damages. First, the choice of a laboratory friction test allowing the tribological characterization applied to hot steel working is presented and justified. The methodology of use of the test bench is detailed. Results provided by the friction test are presented as performance pointers, allowing quantifying the capacities of the lubricant to reduce friction or to protect work piece and tool surfaces. Second, a first series of tests is run. Results show the reliability and the robustness of the test bench, in particular in terms of sensitivity and repeatability. Finally, a second series of tests is performed. It leads to the qualification of the graphite aqueous solutions, used as lubricant in hot forging of steels. The results present the performances of the graphite lubricants according to their composition (grain size distribution, binder), their spraying technique, and the mechanical loadings they undergo.
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Submitted on : Wednesday, November 25, 2020 - 3:45:42 PM
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  • HAL Id : tel-03023895, version 1


Estelle Daouben. Compréhension des mécanismes d'endommagement en surface des outils de forge à chaud : effets des lubrifiants. Génie mécanique [physics.class-ph]. Université de Valenciennes et du Hainaut-Cambrésis, 2009. Français. ⟨NNT : 2009VALE0014⟩. ⟨tel-03023895⟩



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