PhD Studentship in Production Technology – Specializing in Advanced Processing and Characterization of Duplex Stainless Steels – Welding, HIP, and Additive Manufacturing
Research in The Division of Welding Technology in the Department of Engineering Science focus around three main areas in relation to welding technology; Metallurgy, Process physics modelling, and Process development and control.
Our main aim is to fundamentally study and improve understanding of welding processes and its influence on the materials. In a new project in cooperation with Swedish industry we seek a PhD student for a position at University West.
The scientific work in the project
Efficient and successful production and joining of duplex stainless steels requires precise control of processes and in depth understanding of relations between composition, processing thermal cycles and resulting microstructures as these control properties. This is true both for steel production using conventional melting, rolling and heat treatment as well as component production with powder metallurgy using hot isostatic pressing or powder based additive manufacturing (AM). Joining by welding or building components using wire arc additive manufacturing (WAAM) adds to complexity by introducing local variations in thermal cycles resulting in an inhomogeneous microstructure making control and prediction of microstructures and properties even more complex.
In the welding technology group, there are a number of ongoing and recent projects dealing with both production and welding of duplex stainless steels. Techniques to control and monitor thermal cycles have been developed which together with instruments and software for evaluation and modelling of thermal cycles and microstructures provide unique possibilities to study these versatile but complex materials. With access to a state-of-the-art SEM-EBSD, Gleeble Thermomechanical testing equipment, Arc Heat Treatment equipment, hardness mapping facilities as well as relevant software for modelling and thermodynamic calculations it is possible to both apply well-controlled desired thermal cycles and evaluate resulting microstructures in detail at a fine scale.
Problems and materials would initially be selected from ongoing projects on duplex stainless steels, AM components and weld metals. Focus will be mainly on highly alloyed grades as these are more sensitive to variations in thermal cycles, but complementary studies should also be made on other grades.
Potential research questions include:
- effects of multiple thermal cycles in WAAM,
- early stages of precipitation and phase separation and effects of differences in composition between welding consumables and base material,
- loss of nitrogen and how this depends on process and material grade and effects on phase balance,
- influence of crystallographic features and processing conditions on material response to thermal cycles.
PhD degree program: Production Technology
Research center: https://www.hv.se/en/research/research-education/production-technology/">https://www.hv.se/en/research/research-education/production-technology/
Job description: The research program includes, in addition to participation in third-cycle courses and other activities, implementation of an independent thesis work.
Qualification requirements: Please read 3.1 and 3.2 in General syllabus for the third-cycle programme in Production Technology, Ref. No 2015/1343 B 25: https://www.hv.se/en/research/research-education/courses/production-technology/
Selection: Please read 3.3 in General syllabus.
Qualifications of merit for this position:
- Master of Science (or equivalent level) in Material Science or equivalent
- Knowledge of welding and additive manufacturing (metallurgy and processes)
- Good knowledge of stainless steels in general and duplex stainless steels in particular
- Experience in material- and property characterization
- Experience of microstructural characterization using techniques such as SEM, XRD, TEM etc is regarded as a merit
- Good understanding of material affecting issues during processing and production
- Experience of modelling and thermodynamical calculations is a merit
- Experience of research work and scientific writing (prior publications in the subject is regarded as a merit)
- Willingness to travel and perform experiments outside of University West if needed
- Ability to communicate orally and in writing in English (documented)
- Ability to communicate in Swedish is regarded as a merit
Duration and terms of employment: Please read the Higher Education Ordinance (SFS 1993:100) Chapter 5 section 7.
Applications - go to https://www.hv.se/en/research/research-education/production-technology/">https://www.hv.se/en/research/research-education/production-technology/.
The application must include:
- CV/Personal qualifications
- Personal letter containing: - Interest in the research topic. - Previous experience regarding the proposed research topic and its research methods. - Motive to pursue Doctoral studies.
- Degree project of second level of higher education
- Degree certificate of first and second level of higher education
- Other documents which the applicant wishes to invoke
+46520-22 32 81, firstname.lastname@example.org
+46520-22 33 73, email@example.com
+46520-22 33 59, firstname.lastname@example.org