Browsing by Keyword "Thermal fatigue"
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Item Equipamiento y metodología para la determinación de la vida de materiales para moldes(2010) Abuin, A.; Galarraga, H.; Crespo, I.; Plaza, L. M.; Carnicer, P.; Vicario, I.; García, J. C.; SG; CIRMETAL; PROMETAL; Tecnalia Research & InnovationDies used in the non ferrous die casting process, have a limited service life due to the damage effect by surface cracking appearance. These cracks are mainly produced by thermal fatigue, which are promoted by a repeated heating and cooling process through working cycles. The existing demand to improve materials to extend the die's service life leads to the development of new equipments to test the material behaviour. INASMET-TECNALIA in collaboration with FEAF (Spanish Federation of the Foundry Associations), has developed a testing machine to evaluate the thermal fatigue behaviour of steels used to manufacture dies. This testing machine is able to test forty samples simultaneously, getting a remarkable advantage in regard to previous developed test equipment. The versatility of heating and cooling system makes possible to test all kind of materials in very different thermal fatigue conditions.Item Failure assessment in a h10 hot die forging tool related to thermal fatigue(TANGER Ltd., 2015) Amondarain, Zuriñe; Mendia, Leire; Perez, Iñaki; Lachmann, Stefan; Tecnalia Research & Innovation; Caracterización y Validación. Materiales; PROMETALA failure analysis has been performed to investigate the root cause for the rejection of the H10 (DIN 1.2365) hot work tool steel of the Hatebur forging machine. The punch is subjected to intensive thermal shocks, cyclically variable loads and high pressure at high temperatures. Although several surface defects are found related to different degradation phenomena, the higher thermal expansion occurred at the surface, compared with the inner part of the die, makes thermal fatigue the main failure responsible. In fact, thermal conductivity of an alloy will depend upon temperature and microstructure and therefore time and of course chemical composition. Damage analysis including dimensional control, surface analysis and metallographic analysis is completed by ThermoCalc and JMatPro calculations done for the standard 1.2365 tool steel. These are very useful tools to know in advance which are the stability ranges of the phases present (at equilibrium and nonequilibrium conditions), the elements in solid solution, the nature of the carbides, CCT curves and some other features for a better understanding of the failure analysis of the described system.