Tandem Bayesian MTandem Bayesian MConditions Considering HAZ Shape Factor Conditions Considering HAZ Shape Factor Hitoshi Izuno1, Masahiko Demura1, Kenji Nagata2, Yoh-ichi Mototake3, Daisuke Abe4 and Keisuke Torigata4 Hitoshi Izuno1, Masahiko Demura1, 1 Research Network and Facility Services Division, National Institute for Materials Science (NIMS) Kenji Nagata2, Yoh-ichi Mototake3, Daisuke Abe4 and Keisuke Torigata4 2 Center for Basic Research on Materials, National Institute for Materials Science (NIMS) 1 Research Network and Facility Services Division, National Institute for Materials Science (NIMS) 3 Hitotsubashi University 2 Center for Basic Research on Materials, National Institute for Materials Science (NIMS) 4 IHI Corporation 3 Hitotsubashi University 4 IHI Corporation The creep rupture life of ferritic heat-resistant steel such as 2 1/4Cr-1Mo steel weld joints is dominated The creep rupture life of ferritic heat-resistant steel such as 2 1/4Cr-1Mo steel weld joints is dominated by Type IV cracking that occurs in the heat-affected zone (HAZ). The HAZ shape of a weld joint by Type IV cracking that occurs in the heat-affected zone (HAZ). The HAZ shape of a weld joint influences the rupture life through creep damage accumulation. We addressed the inverse problem of influences the rupture life through creep damage accumulation. We addressed the inverse problem of extending the creep rupture life of weld joints by controlling HAZ shape via welding conditions. Using extending the creep rupture life of weld joints by controlling HAZ shape via welding conditions. Using the workflow that predicts creep rupture life from the predicted HAZ shape from welding conditions the workflow that predicts creep rupture life from the predicted HAZ shape from welding conditions which have implemented in MInt system, we presented a tandem Bayesian model for predicting the which have implemented in MInt system, we presented a tandem Bayesian model for predicting the welding condition for longer creep life via HAZ shape factors. The welding conditions and HAZ shape welding condition for longer creep life via HAZ shape factors. The welding conditions and HAZ shape factors were connected by Gaussian process. A Bayesian linear regression that incorporates the concept factors were connected by Gaussian process. A Bayesian linear regression that incorporates the concept of model selection was used to predict rupture life from HAZ shape factors. We connected these models of model selection was used to predict rupture life from HAZ shape factors. We connected these models probabilistically by Bayesian statistical mathematics and constructed a search algorithm based on the probabilistically by Bayesian statistical mathematics and constructed a search algorithm based on the probabilistic model. Start from 49 initial HAZ shape factors and 22 creep rupture life data within the probabilistic model. Start from 49 initial HAZ shape factors and 22 creep rupture life data within the 5764801 welding conditions combination we performed forward calculations of 20 rupture lives to find 5764801 welding conditions combination we performed forward calculations of 20 rupture lives to find welding conditions that can improve the creep rupture life by 12% over the initial data. welding conditions that can improve the creep rupture life by 12% over the initial data. Multiscale Multiscale Duplex Steels Duplex Steels S. Yanagawa 1,2 and I. Watanabe 1 Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, S. Yanagawa 1,2 and I. WatanabeUniversity of Tsukuba 1 Degree Programs in Pure and Applied Sciences, Graduate School of Science and Technology, 2 Center for Basic Research on Materials, National Institute for Materials Science (NIMS) University of Tsukuba 2 Center for Basic Research on Materials, National Institute for Materials Science (NIMS) The yield point phenomenon is observed in a variety of materials and is particularly dominant in carbon The yield point phenomenon is observed in a variety of materials and is particularly dominant in carbon steels. Mechanisms of the aforementioned behavior is believed to be the inhibition of dislocation motion steels. Mechanisms of the aforementioned behavior is believed to be the inhibition of dislocation motion by interstitial atoms such as carbon. The yield point phenomenon in which an abrupt stress drop and by interstitial atoms such as carbon. The yield point phenomenon in which an abrupt stress drop and localized deformation occur is often neglected in numerical simulations such as finite element analysis localized deformation occur is often neglected in numerical simulations such as finite element analysis because it is an unstable phenomenon and leads to the numerical instability. In this study, finite because it is an unstable phenomenon and leads to the numerical instability. In this study, finite element analysis of Ferrite phase was performed using the constitutive model that takes into account the element analysis of Ferrite phase was performed using the constitutive model that takes into account the yield point phenomenon. The true stress–strain relationship of Ferrite phase was reproduced by yield point phenomenon. The true stress–strain relationship of Ferrite phase was reproduced by minimizing residual error between a computational simulation and experiment of tensile test, where the minimizing residual error between a computational simulation and experiment of tensile test, where the yield point phenomenon in a tensile test of Ferrite steel was reproduced. Additionally, finite element yield point phenomenon in a tensile test of Ferrite steel was reproduced. Additionally, finite element models of ferrite-pearlite duplex microstructure with pearlite volume fractions of 21.5% and 40.3% were models of ferrite-pearlite duplex microstructure with pearlite volume fractions of 21.5% and 40.3% were prepared and used to investigate the macroscopic response and microscopic deformation mechanisms. prepared and used to investigate the macroscopic response and microscopic deformation mechanisms. Furthermore, finite element simulations of uniaxial tensile tests were performed using the stress-strain Furthermore, finite element simulations of uniaxial tensile tests were performed using the stress-strain relationship of ferrite-pearlite duplex microstructure to reproduce the yield point phenomenon in relationship of ferrite-pearlite duplex microstructure to reproduce the yield point phenomenon in uniaxial tensile tests. The yield point phenomenon in Ferrite-Pearlite duplex steels was successfully uniaxial tensile tests. The yield point phenomenon in Ferrite-Pearlite duplex steels was successfully reproduced. reproduced. Finite Element Analysis of Yield Point Phenomenon in Ferrite-pearlite Finite Element Analysis of Yield Point Phenomenon in Ferrite-pearlite odel: Connection of odel: Connection of 1,2 1,2 Poster Presentation ｜NIMS Award Symposium 2023Masayoshi Yamazaki1, Satoshi Minamoto1, Junya Sakurai1, Masayoshi Yamazaki1, Satoshi Minamoto1, Junya Sakurai1, Weld Joint Creep Performance and Weld Joint Creep Performance and P4 ｜ ModelingPP44--1177 PP44--1177 Welding Welding PP44--1188 PP44--1188 77
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