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Parameters Identification of High Temperature Damage Model of X12 Alloy Steel for Ultra-Supercritical Rotor Using Inverse Optimization Technique

X12 alloy steel is a new generation material for manufacturing ultra-supercritical generator rotors. Cracks will appear on the forgings during the forging process and the rotors will be scrapped in serious cases. To optimize the forging process of the rotor and avoid the occurrence of crack defects...

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Autores principales: Chen, Xuewen, Du, Kexue, Du, Yuqing, Lian, Tingting, Liu, Jiqi, Bai, Rongren, Li, Zhipeng, Yang, Yisi, Jung, Dongwon
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2021
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7867318/
https://www.ncbi.nlm.nih.gov/pubmed/33540797
http://dx.doi.org/10.3390/ma14030695
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author Chen, Xuewen
Du, Kexue
Du, Yuqing
Lian, Tingting
Liu, Jiqi
Bai, Rongren
Li, Zhipeng
Yang, Yisi
Jung, Dongwon
author_facet Chen, Xuewen
Du, Kexue
Du, Yuqing
Lian, Tingting
Liu, Jiqi
Bai, Rongren
Li, Zhipeng
Yang, Yisi
Jung, Dongwon
author_sort Chen, Xuewen
collection PubMed
description X12 alloy steel is a new generation material for manufacturing ultra-supercritical generator rotors. Cracks will appear on the forgings during the forging process and the rotors will be scrapped in serious cases. To optimize the forging process of the rotor and avoid the occurrence of crack defects in the hot forming process, based on Oyane damage model, a high temperature damage model of X12 alloy steel was proposed by introducing the influences of temperature and strain rate on the damage evolution. A reverse analysis method was proposed to determine the critical damage value of Oyane damage model by comparing experimental and simulated fracture displacement in the tensile tests. Then, the critical damage value was determined as a function of temperature and strain rate. The high temperature damage model was combined to the commercial finite element software FORGE(®) to simulate the high temperature tensile test. The accuracy of the damage model was verified by comparing the difference of the fracture displacement between simulated and experimental samples. Additionally, as stress triaxiality is a significant factor influencing the damage behavior of ductile materials, the effects of temperature and strain rate on the stress triaxiality of X12 alloy steel was analyzed by simulating the high temperature tensile process, and the damage mechanism of X12 alloy steel under high stress triaxiality was analyzed by SEM (Scanning Electron Microscope).
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spelling pubmed-78673182021-02-07 Parameters Identification of High Temperature Damage Model of X12 Alloy Steel for Ultra-Supercritical Rotor Using Inverse Optimization Technique Chen, Xuewen Du, Kexue Du, Yuqing Lian, Tingting Liu, Jiqi Bai, Rongren Li, Zhipeng Yang, Yisi Jung, Dongwon Materials (Basel) Article X12 alloy steel is a new generation material for manufacturing ultra-supercritical generator rotors. Cracks will appear on the forgings during the forging process and the rotors will be scrapped in serious cases. To optimize the forging process of the rotor and avoid the occurrence of crack defects in the hot forming process, based on Oyane damage model, a high temperature damage model of X12 alloy steel was proposed by introducing the influences of temperature and strain rate on the damage evolution. A reverse analysis method was proposed to determine the critical damage value of Oyane damage model by comparing experimental and simulated fracture displacement in the tensile tests. Then, the critical damage value was determined as a function of temperature and strain rate. The high temperature damage model was combined to the commercial finite element software FORGE(®) to simulate the high temperature tensile test. The accuracy of the damage model was verified by comparing the difference of the fracture displacement between simulated and experimental samples. Additionally, as stress triaxiality is a significant factor influencing the damage behavior of ductile materials, the effects of temperature and strain rate on the stress triaxiality of X12 alloy steel was analyzed by simulating the high temperature tensile process, and the damage mechanism of X12 alloy steel under high stress triaxiality was analyzed by SEM (Scanning Electron Microscope). MDPI 2021-02-02 /pmc/articles/PMC7867318/ /pubmed/33540797 http://dx.doi.org/10.3390/ma14030695 Text en © 2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Chen, Xuewen
Du, Kexue
Du, Yuqing
Lian, Tingting
Liu, Jiqi
Bai, Rongren
Li, Zhipeng
Yang, Yisi
Jung, Dongwon
Parameters Identification of High Temperature Damage Model of X12 Alloy Steel for Ultra-Supercritical Rotor Using Inverse Optimization Technique
title Parameters Identification of High Temperature Damage Model of X12 Alloy Steel for Ultra-Supercritical Rotor Using Inverse Optimization Technique
title_full Parameters Identification of High Temperature Damage Model of X12 Alloy Steel for Ultra-Supercritical Rotor Using Inverse Optimization Technique
title_fullStr Parameters Identification of High Temperature Damage Model of X12 Alloy Steel for Ultra-Supercritical Rotor Using Inverse Optimization Technique
title_full_unstemmed Parameters Identification of High Temperature Damage Model of X12 Alloy Steel for Ultra-Supercritical Rotor Using Inverse Optimization Technique
title_short Parameters Identification of High Temperature Damage Model of X12 Alloy Steel for Ultra-Supercritical Rotor Using Inverse Optimization Technique
title_sort parameters identification of high temperature damage model of x12 alloy steel for ultra-supercritical rotor using inverse optimization technique
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7867318/
https://www.ncbi.nlm.nih.gov/pubmed/33540797
http://dx.doi.org/10.3390/ma14030695
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