Description

This project aims at establishing an experimental methodology and a modelling approach of residual creep lifetime of steam methane reforming tubes used for hydrogen production. The microstructural evolution and damage development will be quantitatively linked to loading conditions using a model that takes underlying physical mechanisms into account. These mechanisms are to be identified during the project, by detailed investigation of crept specimens and of serviced tubes. The methodology and the modeling approach are to be extended within Air Liquide to assess the lifetime of in-service tubes, in both current and future operating conditions.

Skills required

Typical profile for a thesis at MINES Paris: Engineer and / or Master of Science - Good level of general and scientific culture. Good level of knowledge of French (B2 level in french is required) and English. (B2 level in english is required) Good analytical, synthesis, innovation and communication skills. Qualities of adaptability and creativity. Teaching skills. Motivation for research activity. Coherent professional project. Prerequisite (specific skills for this thesis): Strong background in metallurgy together with sound knowledge in mechanics of materials. The candidate is expected to be strongly involved in experimental work and also to be intersted in physically-based modelling. Applicants should supply the following : • a detailed resume • a copy of the identity card or passport • a covering letter explaining the applicant’s motivation for the position • detailed exam results • two references: the name and contact details of at least two people who could be contacted • to provide an appreciation of the candidate • Your notes of M1, M2 • level of English equivalent TOEIC to be sent to recrutement_these@mat.mines-paristech.fr and to anne-francoise.gourgues-lorenzon@minesparis.psl.eu

Bibliography

Fuyang, C-m, Chen J-y, Shao B., et coll. (2021) Effect of microstructural evolution in themal exposure on mechanical properties of HP40Nb alloy. International Journal of Pressure Vessels and Piping 192, 104391.
Fuyang C., Gong J., Wang X, et coll. (2022) A physics-based life prediction model of HP40Nb heat-resistant alloy in a coupled creep-carburisation environment. Materials Science and Engineering A860, 144260.
Gaffard V., J. Besson J., Gourgues-Lorenzon A.-F. (2005). Creep failure model of a tempered martensitic stainless steel integrating multiple deformation and damage mechanisms. International Journal of Fracture 133, 139-166.
Larson, F.R. and Miller, J. (1952). A time–temperature relationship for rupture and creep stresses, Transactions of the ASME 74, 765–775.
Panait C.G. (2010). Metallurgical evolution and creep strength of 9-12% Cr heat resistant steels at 600°C and 650°C. PhD thesis, Mines Paris (in English). https://pastel.hal.science/pastel-00579983

Keywords

Refractory alloys , Thermal ageing , Viscoplastic flow , Cavitation, Creep lifetime