PSI - Issue 58

ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

Procedia Structural Integrity 58 (2024) 9–16

© 2024 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 ICSID 2023 Organizers Abstract This study investigates the influences of the four different microstructure morphologies on the calculation of the fatigue crack initiation cycle number for 9Cr-1Mo (P91) under cyclic loading conditions at room temperature. Understanding the critical influence of microstructure behavior on material durability necessitates examining two principal microstructure morphologies: irregular microstructures with inhomogeneous and homogeneous grain shapes, which were generated using the Voronoi Tessellation (VT) method. Finite Element Method (FEM) simulations were conducted to identify different stress distributions across these artificial microstructures. These stress distributions were subsequently analyzed using the physics-based Tanaka-Mura model (TMM) to estimate the number of cycles for fatigue crack initiation at several stress amplitudes and four types of microstructure. The fatigue resistance of the homogeneous grain morphology was discovered to be higher than that of the inhomogeneous microstructure, indicating the possibility of developing more durable material designs. The investigation into the different microstructure morphology of steel P91 offers a significant advancement in fatigue research, particularly with implications for power plants. © 2024 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 ICSID 2023 Organizers Keywords: Microstructure Morphology; Finite Element Method (FEM); 9Cr-1Mo (P91); Tanaka-Mura Model (TMM); Fatigue Crack Initiation (FCI) Abstract This study investigates the influences of the four different microstructure morphologies on the calculation of the fatigue crack initiation cycle number for 9Cr-1Mo (P91) under cyclic loading conditions at room temperature. Understanding the critical influence of microstructure behavior on material durability necessitates examining two principal microstructure morphologies: irregular microstructures with inhomogeneous and homogeneous grain shapes, which were generated using the Voronoi Tessellation (VT) method. Finite Element Method (FEM) simulations were conducted to identify different stress distributions across these artificial microstructures. These stress distributions were subsequently analyzed using the physics-based Tanaka-Mura model (TMM) to estimate the number of cycles for fatigue crack initiation at several stress amplitudes and four types of microstructure. The fatigue resistance of the homogeneous grain morphology was discovered to be higher than that of the inhomogeneous microstructure, indicating the possibility of developing more durable material designs. The investigation into the different microstructure morphology of steel P91 offers a significant advancement in fatigue research, particularly with implications for power plants. © 2024 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 ICSID 2023 Organizers Keywords: Microstructure Morphology; Finite Element Method (FEM); 9Cr-1Mo (P91); Tanaka-Mura Model (TMM); Fatigue Crack Initiation (FCI) 2452-3216 © 2024 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 ICSID 2023 Organizers 2452-3216 © 2024 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 ICSID 2023 Organizers 7th International Conference on Structural Integrity and Durability (ICSID 2023) Impact of microstructure morphology on fatigue crack initiation in 9Cr-1Mo (P91) through numerical simulation M.R.A. Rahim a,b,* , S. Schmauder a , Y.H.P. Manurung c , Ž . Bo ž i ć d , P. Binkele a , J. Dusza e , T. Csanádi e , M.I.M. Ahmad f , M.F. Mat c , K.J. Dogahe a,g 7th International Conference on Structural Integrity and Durability (ICSID 2023) Impact of microstructure morphology on fatigue crack initiation in 9Cr-1Mo (P91) through numerical simulation M.R.A. Rahim a,b,* , S. Schmauder a , Y.H.P. Manurung c , Ž . Bo ž i ć d , P. Binkele a , J. Dusza e , T. Csanádi e , M.I.M. Ahmad f , M.F. Mat c , K.J. Dogahe a,g a Institute for Materials Testing, Materials Science and Strength of Materials (IMWF), University of Stuttgart, 70569 Stuttgart, Germany b Department of Occupational Safety and Health (DOSH) Sarawak, 93100 Kuching, Sarawak, Malaysia c SMRI and School of Mechanical Engineering, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia d Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lucica 5, 10000 Zagreb, Croatia e Institute of Materials Research of SAS, Watsonova 47, 040 01 Košice , Slovakia f Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, 43600 Universiti Kebangsaan Malaysia (UKM), Selangor, Malaysia g Graduate School of Advanced Manufacturing Engineering (GSaME), University of Stuttgart, Nobelstraße 12, 70569 Stuttgart, Germany a Institute for Materials Testing, Materials Science and Strength of Materials (IMWF), University of Stuttgart, 70569 Stuttgart, Germany b Department of Occupational Safety and Health (DOSH) Sarawak, 93100 Kuching, Sarawak, Malaysia c SMRI and School of Mechanical Engineering, Universiti Teknologi MARA (UiTM), 40450 Shah Alam, Selangor, Malaysia d Faculty of Mechanical Engineering and Naval Architecture, University of Zagreb, Ivana Lucica 5, 10000 Zagreb, Croatia e Institute of Materials Research of SAS, Watsonova 47, 040 01 Košice , Slovakia f Department of Mechanical and Manufacturing Engineering, Faculty of Engineering and Built Environment, 43600 Universiti Kebangsaan Malaysia (UKM), Selangor, Malaysia g Graduate School of Advanced Manufacturing Engineering (GSaME), University of Stuttgart, Nobelstraße 12, 70569 Stuttgart, Germany

2452-3216 © 2024 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 ICSID 2023 Organizers 10.1016/j.prostr.2024.05.003