ISSUE 1/2014

/// 01
Perrier, F.; Desrayaud, C.; Bouvier, V.; Duperray, L.; Epale, R.
Response to the article: Effect of process route on the structure, tensile, and fatigue properties of aluminium alloy automotive steering knuckles

This paper is a response to the article, “Effect of process route on the structure, tensile, and fatigue properties of aluminium alloy automotive steering knuckles” [Anyalebechi, P. N.: Effect of process route on the structure, tensile, and fatigue properties of aluminium alloy automotive steering knuckles. International Foundry Research 63 (2011), [no. 3], pp. 32-431]. It contains the results made on CobapressTM knuckles in an independent laboratory (Centre Technique des Industries de la Fonderie, Sèvres, France). In the current study, the SDAS is the thinnest for the hybrid casting-forging CobapressTM knuckles compared to the vacuum riserless/pressure riserless casting (VRC/PRC) and the pressure counter pressure casting (PCPC). No porosity was observed in the microstructure and the mechanical properties are in accordance with the customers requirements. Despite, all the knuckles have a relatively similar behavior in fatigue; CobapressTM knuckles have the best fatigue strength at 106 and 107 cycles. If we take into account the good surface quality and the substructuration of the microstructure in the subsurface, the fatigue properties of the whole part is really higher for the CobapressTM knuckles.




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