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When the research started, knowledge of the thermic, mechanical and metallurgical phenomena occurring during secondary cooling was limited. This research has enabled the situation to be greatly improved. First of all, the theoretical study of the secondary cooling of beam blanks provided basic knowledge of the phenomena in question. Digital simulations made it possible to determine the thermal path traveled by the beam, and metallographic studies revealed the mechanisms responsible for fissuring. The two studies were completely complementary and gave concordant results: the hardening structure present on the lower surface of the wing tips under standard cooling conditions is at the root of the faults found with certain steels. Gradual modifications to the secondary cooling resulted in the hardness measured at the lower and upper surfaces becoming almost equivalent. The research thus made it possible to eliminate the principal cause of the defects found on the lower surface of the wing tips.

Additional information

Authors: BOURDOUXHE M, ProfilARBED, Esch-sur Alzette (LU);WALMAG G, CRM, Liège (BE)
Bibliographic Reference: EUR 20183 FR (2002), pp.84. Euro: 13.00
Availability: EUR-OP reference: KI-NA-20183-FR-S Available from EUR-OP sales agents. URL:
ISBN: ISBN: 92-894-3207-1
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