Research

As part of the SFB 103 Transfer Project T8, Jonathan Streitberger is investigating the creep behavior of single- and polycrystalline Ni-base superalloys. His work focuses on the influence of complex γ′-particle morphologies and sizes on the mechanical properties of the materials. In particular, he investigates γ′-particle shapes that arise as a result of the slow solidification of large volumes of alloy. In addition to ideal cubic or spherical γ′ precipitates, irregular, dendritic structures as well as densely grouped multiplets (duplets and octets) are characterized regarding their formation during casting and heat treatment. Their influence on the mechanical properties of the material is determined using creep tests. Their influence on the mechanical properties of the material is determined using creep tests. Another focus is on directional particle coarsening (rafting), which occurs during uniaxial creep at elevated temperatures in the <100> direction.To precisely and rapidly quantify these γ/γ′ microstructures, Jonathan Streitberger employs modern computer vision methods, including machine learning and deep learning. The research is complemented by creep tests on actual turbine blades, in which both new and end-of-service components are tested.

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since 11.2024:
Research Associate, Chair for Materials Science and Engineering (LWW), Ruhr University Bochum (RUB)

2021 – 2024:
Internship semester & working student position at VDM Metals, R&D in the mobility department (automotive)

2019 – 2021:
Student Assistant, Chair for Materials Science and Engineering (LWW), Ruhr University Bochum (RUB)

2015 – 2024:
Study of Mechanical Engineering – Specialization in Materials and Microengineering, Ruhr University Bochum (RUB)
Bachelor’s thesis: "On the influence of Mo and W in addition to the γ/γ’ microstructure on the creep properties of nickel-based superalloys"
Master’s thesis: "Effect of gamma-prime phase on precipitation kinetics of sigma phase in superalloys and its influence on creep behavior"

Research

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Publications