Supervisor: Project manager
Localization: Toulouse, France and State College, PA
The Institut de Recherche Technologique Antoine de Saint Exupéry seeks to reinforce the competitiveness of research and industry in the French aeronautic, spatial, and embedded systems domains in Occitanie, Nouvelle Aquitaine, and Provence-Alpes-Côte d’Azur.
Financed 50% by the public sector and 50% by the private sector, the IRT regroups the industries of the aforementioned regions, public establishments, and their laboratories in order to collaborate in three strategic technological domains: high-performance multifunctional materials, more electrical aircraft, and embedded systems.
As part of its developmental goals, the IRT is seeking a Post-doctoral Research Engineer on the subject of “Precipitation and dissolution kinetics during heat treatment of Ni alloy 718 components produced by additive manufacturing – microstructural evolutions and metallurgy” (F/H) for a duration of 18 months. This work is to be carried out in partnership with The Pennsylvania State University and the work will be split more or less evenly between the United States and France.
The production of critical aircraft or satellite components by additive manufacturing requires a profound understanding of as-built microstructures and evolutions of the metallurgical state of the part over time. A relationship between microstructure and mechanical properties is thus established and permits the operational limitations of the part to be defined. The justification of these criteria necessitates the development of robust experimental databases as well as predictive numerical models and advanced dimensioning methods. These integrate the microstructural and metallurgical characteristics of the produced parts as well as their evolutions in service.
The proposed research activities fall within the scope of the AnDDurO project, in which the IRT Saint Exupéry collaborates with several industrial partners in the aerospace and spatial domains and notably a number of small and medium businesses in the additive manufacturing sector. This project aims to improve the scientific understanding of powder bed additive manufacturing techniques for alloys of titanium, nickel, and aluminum. The notion of durability, central to the project, is studied as it relates to physical metallurgy, mechanical resistance to different types of loads, the impact of process defects, and the effects of long-term heat treatments.
The objective of the post-doctoral work is to generate a reliable data set describing materials produced by the different additive manufacturing technologies considered in the project. The principal tasks include the metallurgical and microstructural characterizations of additively-manufactured nickel alloy 718 as well as phase transformation kinetics during different stages of post-fabrication heat treatments.
The planned work program is described as follows:
- Understanding of the subject, the associated problems/questions to address, the specific tasks to be performed, the targeted objectives, and the characterization techniques to be employed to achieve those objectives.
- Metallurgical characterizations essentially based on the study of phase transformations during heating and cooling of samples produced using the different additive manufacturing technologies studied. This is a key point in the study and will utilize thermal analyses such as dilatometry and potentially other complimentary techniques.
- Microstructural characterizations of both as-built and post-treated samples. These characterizations will be performed at each step of thermomechanical processing to observe the evolution of the microstructure and optimize the heat treatment of AM parts.
- Fine characterization (SEM, TEM) of hardening precipitates over the course of aging heat treatments and determination of the peak aging point for AM alloy 718.
- Construction of simulated phase transformation diagrams (CHT, CCT) specific to AM alloy 718 and comparison with the existing literature on cast or wrought products.
- Production of a report containing the description of the techniques and experimental methods employed, the results obtained, and their interpretation.
This work program will be executed in collaboration with university laboratories in the region.
The applicant should possess a Ph.D. in Materials / Metallurgy / Mechanics with at least 3 years of experience in the study of metallic materials in an industrial setting, technical center, or research laboratory.
- Understanding of additive manufacturing processes of metallic alloys
- Understanding of metallurgy and mechanical behavior of nickel superalloys produced by conventional processes or by additive manufacturing
- Technical experience with
- Metallographic preparation
- Tools for microstructural characterization (optical and electron microscopy) and metallurgical transformations (notably thermal analyses—a practical knowledge of techniques like absolute or differential dilatometry, DTA, and/or TMA is a plus)
- CALPHAD methods and numerical tools
- Ability to define and employ experimental protocols
- Ability to critically and objectively interpret experimental results
- Ability to diagnose and resolve problems
- Must conform to hygiene and safety regulations
- Must have a professional level of English (written and spoken)
Other requirements :
- Aptitude and desire to perform experimental work
- Ability to work in a team
- Can manage priorities well and adapt to change.
- Analytical mindset, listening skills, and ability to effectively communicate technical information.
- Hard-working, dependable, and rigorous.
While the work planned for this position is to be split between The Pennsylvania State University and the IRT Saint Exupéry, only proficiency in English is necessary. Knowledge of the French language is a plus, but the lack thereof is not an obstacle to a successful candidature.
If this offer is of interest, please send your candidature (cover letter + CV) to firstname.lastname@example.org with the reference 18PD-MAT-AND-02.