PSI - Issue 47

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2022) 000–000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 47 (2023) 478–487

© 2023 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Particularly, in the presented paper a comparison of the resulting fatigue strength of ferritic EN-GJS-400-18LT, ferritic silicon solid-solution strengthened EN-GJS-450-18 and EN-GJS-700-2 is conducted. The comparison is done for the base material and the welded condition by the help of axial and bending specimens. For the investigated material conditions, the results show reduction in the fatigue strength for axial loading for EN-GJS-400-18LT and EN-GJS-700-2 by about 30 % while the silicon solid solution strengthened EN-GJS-450-18 dropped down to around 25 % of the fatigue strength of the base material. © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons Keywords: Nodular cast iron; repair welding; fatigue strength 27th International Conference on Fracture and Structural Integrity (IGF27) An investigation on the fatigue strength of repair welded nodular cast iron for heavy sections Christoph Bleicher*, Steffen Schoenborn, Heinz Kaufmann Fraunhofer Institute for Structural Durability and System Reliability LBF, Bartningsstrasse 47, 64289 Darmstadt, Germany Abstract Large cast components made of nodular cast iron for heavy industry and wind energy turbines are usually not completely free of local material defects. In the case those material defects occur locally and near the component’s surface this will lead to negative effects on lifetime, when high surface stresses and sharp notches or stress gradients are present and interact. One measure to bring the components into usage for foundries is to determine the defect characteristics and remove the defect by a defined manufacturing and a subsequent welding process. Nevertheless, repair welding is not accepted by certification bodies due to a lack of knowledge of the cyclic material behavior of repair welded nodular cast iron. Within the research project “nodularWELD” the possibilities for welding thick-walled nodular cast iron are investigated on ferritic, ferritic silicon solid-solution strengthened and pearlitic cast iron grades. Afterwards the welded cast materials are subjected to cyclic stress based fatigue tests to determine the influence of the welding in comparison to the base material.

* Corresponding author. Tel.: +49-6151-8359. E-mail address: christoph.bleicher@lbf.fraunhofer.de

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons

2452-3216 © 2023 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the IGF27 chairpersons 10.1016/j.prostr.2023.07.076