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Caractérisation de la tribologie des procédés de mise en forme à haute température

Abstract : Identification of friction data at high temperatures is still a critical point in the optimization of forming processes. The present paper presentsthe Warm and Hot Upsetting Sliding Test (WHUST):a test bench dedicated to the tribology of metal forming processes at high temperature. The friction test operates according to a large range of plastic strains, contact pressures and temperatures. The paper presents the methodology developed in order to simulate on the test bench contact conditions encountered at the tool/workpiece interface of various industrial forming processes. Three designs of experiments are discussed. The first one studies the effects of the composition of graphite based lubricants on friction of hot forging tool. A particular attention is paid on the volume of lubricant used, the size of graphite particles and the amount of binding agents. The second set of experiments quantifies the ability of two white lubricants to reduce friction and to protect tool surface. The first lubricant is a mineral salt; the second one is an organic salt. Tests are performed at 1200°C on AISI 4820 steel specimens, with AISI H11 nitrided steel contactors. Results show that the tested white lubricants lead to coefficient of friction similar to those obtained with graphite lubricants. Nonetheless white lubricants lose their ability to reduce friction as soon as the sliding length becomes greater than 10 mm, while graphite lubricants can undergo 30mm. The last design of experiments is performed to qualify a new sol-gel coating deposited on a common tool steel AISI H13. Tests are operated at 1100°C on AISI 4820 steel specimens. Results show that the sol-g
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Submitted on : Friday, November 19, 2021 - 2:51:25 PM
Last modification on : Saturday, November 20, 2021 - 3:49:04 AM

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  • HAL Id : hal-03436721, version 1

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André Dubois, Laurent Dubar, Mirentxu Dubar. Caractérisation de la tribologie des procédés de mise en forme à haute température. 23 èmeCongrès Français de Mécanique, Aug 2017, Lille, France. ⟨hal-03436721⟩

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