# Search for high-creep-strength welding conditions considering HAZ shape factors for 2 1/4Cr–1Mo steel https://mdr.nims.go.jp/datasets/b807e1b1-ffd2-496d-a28c-1fd582910f27 ## File - [Search_for_high-creep-strength_HAZ_shape_factors_for_repository_最終稿.docx](https://mdr.nims.go.jp/filesets/aad004b8-3681-422b-957b-fff8eaebf56f/download) ([Detail](https://mdr.nims.go.jp/filesets/aad004b8-3681-422b-957b-fff8eaebf56f.md)) ## Id b807e1b1-ffd2-496d-a28c-1fd582910f27 ## Local identifier ## Visibility open_to_public ## State published ## Created at 2024-08-23T01:48:06.972761Z ## Updated at 2025-03-26T08:26:11.012903Z ## Published at 2025-03-26T08:26:15.196977Z ## Doi https://doi.org/10.48505/nims.4699 ## First published url https://doi.org/10.1007/s40194-024-01727-3 ## Date published 2024-03-16 ## Recorded date published 2024-5 ## Resource type journal_article ## Manuscript type accepted_manuscript ## Collection ## Title - title: Search for high-creep-strength welding conditions considering HAZ shape factors for 2 1/4Cr–1Mo steel title_type: original lang: en ## Description - description: The creep rupture life of ferritic heat-resistant steel weld joints is limited by Type IV cracking that occurs in the heat-affected zone (HAZ), whose shape affects creep damage accumulation. In this study, we address the inverse problem of extending the creep rupture life of weld joints by controlling HAZ shape via welding conditions. As reported separately, we have developed a workflow that predicts weld joint creep rupture life from the predicted HAZ shape from welding conditions and have implemented it in the material design system. Using this workflow, we presented a tandem Bayesian model for predicting the creep rupture life from welding conditions via the geometric features of HAZ shapes (HAZ shape factors), which are considered to determine the creep rupture life. The prediction model of a HAZ shape factor from welding conditions was formed by Gaussian process regression. The prediction model of the creep rupture life was formed by Bayesian linear regression. These models were probabilistically connected by Bayesian statistical mathematics. An algorithm to increase the creep rupture life was developed to search for welding conditions. This method was applied to a 2 1/4Cr-1Mo heat-resistant steel weld joint simulated with a plate I-bevel three-layer gas tungsten arc welding. The number of welding conditions combination reaches 7 8 = 5764801. Start from 49 initial HAZ shape factors and 22 creep rupture life data, 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. description_type: abstract lang: und ## Creator - name: Hitoshi Izuno role: author orcid: https://orcid.org/0000-0003-0503-3621 organization: National Institute for Materials Science ror: https://ror.org/026v1ze26 - name: Masahiko Demura role: author orcid: https://orcid.org/0000-0002-7308-3041 organization: National Institute for Materials Science ror: https://ror.org/026v1ze26 - name: Masayoshi Yamazaki role: author orcid: https://orcid.org/0000-0003-1051-4892 organization: National Institute for Materials Science ror: https://ror.org/026v1ze26 - name: Satoshi Minamoto role: author orcid: https://orcid.org/0000-0003-4023-5800 organization: National Institute for Materials Science ror: https://ror.org/026v1ze26 - name: Junya Sakurai role: author organization: National Institute for Materials Science ror: https://ror.org/026v1ze26 - name: Kenji Nagata role: author orcid: https://orcid.org/0000-0001-9894-4461 organization: National Institute for Materials Science ror: https://ror.org/026v1ze26 - name: Yoh-ichi Mototake role: author - name: Daisuke Abe role: author - name: Keisuke Torigata role: author ## Contact agent ## Publisher organization: Springer Science and Business Media LLC ## Managing organization ## Keyword - subject: Heat-resistant steel schema: not_defined - subject: Heat-affected zone schema: not_defined - subject: Weld joint schema: not_defined - subject: Creep property schema: not_defined - subject: Bayesian inference schema: not_defined - subject: Inverse problem schema: not_defined - subject: 21/4Cr1–Mo steel schema: not_defined ## Rights - description: 'This version of the article has been accepted for publication, after peer review (when applicable) and is subject to Springer Nature’s AM terms of use, but is not the Version of Record and does not reflect post-acceptance improvements, or any corrections. The Version of Record is available online at: http://dx.doi.org/10.1007/s40194-024-01727-3' identifier: http://rightsstatements.org/vocab/InC/1.0/ ## Other identifier(s) ## Data origin - data_origin_type: other ## Embargo start_date: 2024-03-16 end_date: 2025-03-16 ## Journal - title: Welding in the World issn: '00432288' volume: '68' start_page: 1313 end_page: 1332 ## Conference ## Related item ## Funding - identifier: JPMXP1122684766 funder_name: Ministry of Education, Culture, Sports, Science and Technology - identifier: SIP1 funder_name: Council for Science, Technology and Innovation ## Instrument ## Instrument operator ## Instrument managing organization ## Measurement method ## Specimen ## Chemical composition ## Structure for specimen ## Structural feature for specimen ## Specific property for specimen ## Process for specimen treatment ## Computational method ## Energy level/transition state ## Software ## Custom property ## Fileset - id: aad004b8-3681-422b-957b-fff8eaebf56f filename: Search_for_high-creep-strength_HAZ_shape_factors_for_repository_最終稿.docx content_type: application/vnd.openxmlformats-officedocument.wordprocessingml.document size: 3152490 md5: 7abff0e9ba51c12ffe119db71a633ecb ## Thumbnail fileset_id: aad004b8-3681-422b-957b-fff8eaebf56f filename: Search_for_high-creep-strength_HAZ_shape_factors_for_repository_最終稿.docx