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Master Thesis Work:Experimental investigation and numerical modelling of the strain-induced martensitic transformation of 304L stainless steel during cyclic loading
1 month ago
Background
Many components within Swedish nuclear reactors are constructed from grade 304L
stainless steel. This material is subjected to simultaneous exposure to cyclic loads
induced by vibrations, thermal fluctuations and high temperatures. Furthermore, cyclic loading and deformation of 304L stainless steel have been observed to trigger a strain-induced martensitic transformation of the austenite phase. Consequently, this
transformation alters the soft and ductile nature of the metal, rendering it more akin to
a hard and brittle material, thereby diminishing its fatigue performance. This
transformation is distinguished by significant secondary hardening during constant
amplitude cyclic loading, accompanied by magnetic properties stemming from the
originally non-magnetic austenite phase.
The aim of the MSc thesis project is to acquire understanding concerning the straininduced martensitic transformation of 304L stainless steel across different strain amplitudes and load frequencies. Furthermore, the project seeks to investigate the impact of this transformation on the fatigue life of the metal through fatigue testing. Additionally, an existing numerical return-mapping algorithm, featuring integrated rateindependent plasticity, will be expanded to account for the secondary hardening of stainless steel caused by the strain-induced martensitic transformation.
The present thesis work includes several activities:
• Pre-study and literature survey
• Experimental fatigue tests at KTH to investigate the influence of strain amplitude and load frequencies on the martensitic transformation
• Analysis of the test specimens at the KTH laboratories
• Microstructural analysis of the austenite and martensite phases in the specimens at Forsmark nuclear power plant
• Numerical modelling with a return mapping algorithm to account for the secondary hardening in Matlab
• Study visit to the Swedish nuclear power plants
We are looking for student to join our journey towards a fossil free future. You are soon to be graduated from your academic studies. You also identify yourself with our principles: active, open, positive and safe.
- Education - Master's program (Mechanics, Materials Science, Mechanical Engineering, or Solid Mechanics).
- Scope - 30hp
- Required language skill: Swedish and English
- Location: KTH, Stockholm
- Application – a combined document with your CV and cover letter, and grades are to be submitted in the application.
- Deadline for application is :
Supervisors
- Mustafa Subasic ) – KTH
- Rami Mansour ) – KTH/Aarhus University
- Jonas Faleskog ) – KTH
- PÃ¥l Efsing ) – Vattenfall (Ringhals AB)
- Björn Forssgren ) – Vattenfall (Ringhals AB)
- Fredrik Gustavsson ) – Vattenfall (Forsmarks Kraftgrupp AB
We have been electrifying industries, powering homes and transforming life through innovation and collaboration for more than 100 years. Empowered by our goal, we are determined to enable fossil free living within one generation. To succeed we, as one of Europe's leading energy companies, must be fossil-free ourselves.
But that's not enough. That's why we are looking beyond our own industry, to see where we can really make a difference.
Join us in our journey towards a fossil-free life within one generation.
Want to learn more about what we do? Visit
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Stockholm, Stockholm, Sweden Vattenfall Full timeJob DescriptionBackground Numerous components within Swedish nuclear reactors comprise various grades of stainless steel. This material undergoes simultaneous exposure to cyclic loads from mechanically induced vibrations, thermal fluctuations and elevated temperatures.Moreover, the escalating energy demand within society underscores the critical importance...
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Stockholm, Stockholm, Sweden Vattenfall Full timeJob DescriptionBackground Numerous components within Swedish nuclear reactors comprise various grades of stainless steel. This material undergoes simultaneous exposure to cyclic loads from mechanically induced vibrations, thermal fluctuations and elevated temperatures.Moreover, the escalating energy demand within society underscores the critical importance...
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Stockholm, Stockholm, Sweden Vattenfall Full timeAbout the jobBackgroundSeveral components in Swedish nuclear reactors are made of different types of stainless steel, which are exposed to mechanical vibrations, thermal changes, and high temperatures.Furthermore, the increasing energy needs highlight the crucial role of Sweden's nuclear power plants' long term operation (LTO) program in ensuring stable,...
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