Stéphane Pierret

Subject Matter Expert (SME) – Electrical materials Materials & Structures | Garrett Motion

Stéphane obained his engineering degree in materials science in Nancy, France, from the european school of material science and engineering. He also obtained a master degree in material science from Saarland university, Germany, and specialized into metallic materials during his final project when he focussed on the synthesis and characterisation of Fe-based bulk metallic glasses. Then he moved to Switzerland and joined the institue of materials of the EPFL in Lausanne for his PhD. His PhD was a joined collaboration between Alstom, the EPFL and the Paul Scherrer institute and aimed at investigating, using X-rays and neutrons diffraction techniques, the evolution of the microstructure of single crystal Ni-based superalloys during manufacturing process and creep deformation. Afters successfully defending his PhD thesis in September 2008, Stéphane joinded Safran Aircraft Engines company in France and worked for 4 years as material mechanics engineer. During this period, he submitted several papers in international conferences on the topic of high temperature crack growth mechanisms in wrought Ni-based alloys. Then he moved to design office division of the company and managed several projects to support the transition of innovative life prediction methodologies for aircraft engine rotative components from R&D to design operation work. In 2020, Stéphane decided to join Garrett Advancing Motion, one of the world leading company in turbocharging technology for automotive industry, to be part of the material and structure team in the french site of the company in Thaon-les-Vosges. During 2.5 years, Stéphane was leading the development of high temperature life prediction methodologies of turbine wheel components and implemented creep and TMF materials and life models into design processes. During the same period, he worked at implementing casting simulation capabilities in the software portfolio of the company, espacially focussing on casting defect risk assessment on investment cast turbine wheels made of Ni-based superalloys. 6 month ago, Stéphane moved to a new role of subject matter expert for electrical materials and is now owning material development work for electrical machines within the company.

11:45 - 12:15 Track 2 Session 7 | Foundry Technology

Tuesday 9th May 2023

Hot tear risk and impact of grain structure for turbocharger turbine wheels using ESI Procast