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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.
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.
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.
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.