Open positions

Bachelor and Master Thesis / Internships

An average of around 200 students work at Empa, whether it be in a several-week long internship during their studies or within the scope of their Bachelor’s or Master’s thesis projects. Although the majority of “our” students are enrolled at the two ETHs in Zurich and Lausanne, Swiss universities also “send” their students to Empa for the practical part of their final theses. All student projects are advertised on www.eth-gethired.ch and siropglobal.org.

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Master Thesis:

Residual Stress Analysis of Cold Forged Components Using X-ray Diffraction

The master thesis aims to systematically investigate residual stresses using X-ray methods of cold forged parts after undergoing different hardening processes and steps. The parts will be investigated as produced as well as after extensive use in durability tests.

 

Description
thyssenkrupp Presta is a tier 1 automotive supplier of steering systems to the world's leading car makers. Presta has several decades of experience in cold forging, an important and cost-efficient industrial forming process of steel. Empa is a world-renowned research institute of the ETH domain. Empa has profound knowledge in x-ray analytical methods and state-of-the-art equipment in its center for x-ray analytics in Dübendorf.

The master thesis aims to systematically investigate residual stresses of cold forged parts after undergoing different hardening processes and steps. The parts will be investigated as produced as well as after extensive use in durability tests. The foreseen X-ray diffraction studies will include the analysis of present steel phases, texture evaluation using pole figure scans and quantitative stress determination.

For as produced parts, steel phases and residual stresses need to be identified and correlated with hardening process parameters. For used parts the change in phases and residual stresses are to be determined, all of the above primarily using x-ray methods. Ideally, samples further undergo electropolishing and XRD measurement cycles to analyze the evolution as well as a function of depth.

Experimental results will then be used as input for Presta's finite element simulation department and shall be used to calibrate material models. In addition, the data will also form an important basis for Presta's efforts to predict component and system durabilities in the future.

 

Aim
The master thesis aims to systematically investigate residual stresses of cold forged parts after undergoing different hardening processes and steps. The parts will be investigated as produced as well as after extensive use in durability tests. The foreseen X-ray diffraction studies will include the analysis of present steel phases, texture evaluation using pole figure scans and quantitative stress determination.

 

The master thesis aims to systematically investigate residual stresses of cold forged parts after undergoing different hardening processes and steps. The parts will be investigated as produced as well as after extensive use in durability tests. The foreseen X-ray diffraction studies will include the analysis of present steel phases, texture evaluation using pole figure scans and quantitative stress determination.

 

Contact
Empa: antonia.neels@empa.ch; tel: +41 58 765 45 07 thyssenkrupp: roger.herger@thyssenkrupp.com; +423 377 6729

Empa: ; tel: +41 58 765 45 07

thyssenkrupp: ; +423 377 6729