Papers by Author: Philippe Lours

Abstract: During superplastic forming, dies are subjected to high temperatures and severe environmental conditions. Optimum material grade choice and die design have to take into account all these combined parameters. Microstructure evolution and high temperature mechanical properties are investigated and reported for various Heat Resistant Cast Steels. New die concepts are suggested for energy and cost savings.

Abstract: Based on a coupled numerical and experimental approach, the design and implementation of an in situ thermal-gradient-controlled cyclic oxidation test, dedicated to the investigation of the TGO and TBC spallation, is presented. The influence of the specimen through thickness thermal gradient as well as the benefits of the video real-time monitoring of the cooling phase of an oxidation test is discussed in the case of the spallation of an alumina scale grown on FeCrAl alloys.

Abstract: CROMeP (Research Centre on Tools, Materials and Processes) experience in rapid tooling development is related. Focus is placed on two processes, namely the Direct Metal Laser Sintering/DMLS^Ⓡ and STRATOCONCEPT^Ⓡ currently under consideration for the manufacturing of thermoplastic injection moulds. The principle of the two processing routes as well as the benefits attainable by using those processes will be briefly reviewed. Recent results on the microstructure and the mechanical performances of sample tools built up using both processes are presented.