An improved continuum damage constitutive model is presented to describe the creep behavior of centrifugally cast 20Cr32Ni1Nb stainless steel. In order to determine the internal softening mechanisms of the steel, microstructural observations of damage in 20Cr32Ni1Nb steel are made using the long-term iso-thermal aging treatment. Based on the physics of microstructural processes, a two state variable theory which represents two damage mechanisms related to particle coarsening and microcrack is employed to account for tertiary creep. The kinetic equation which describes the coarsening of the precipitates with time is coupled with Liu-Murakami creep damage constitutive model. Good agreement between predicted and experimental data proves the validity of the proposed model. Compared with the failure times predicted by power law based models, such as Kachanov-Robotnov and Liu-Murakami model, life predictions based on the proposed model are found to be more reasonable over a wide stress range. Additionally, the proposed model is also applied to analyze the accumulation and development of damage in 20Cr32Ni1Nb manifold components.
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ASME 2017 Pressure Vessels and Piping Conference
July 16–20, 2017
Waikoloa, Hawaii, USA
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5798-4
PROCEEDINGS PAPER
An Improved Continuum Damage Constitutive Model for Creep Deformation of Cast 20Cr32Ni1Nb Steel
Xiaofeng Guo,
Xiaofeng Guo
Nanjing Tech University, Nanjing, China
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Jianming Gong,
Jianming Gong
Nanjing Tech University, Nanjing, China
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Luyang Geng
Luyang Geng
Nanjing Tech University, Nanjing, China
Search for other works by this author on:
Xiaofeng Guo
Nanjing Tech University, Nanjing, China
Jianming Gong
Nanjing Tech University, Nanjing, China
Luyang Geng
Nanjing Tech University, Nanjing, China
Paper No:
PVP2017-65583, V005T11A014; 9 pages
Published Online:
October 26, 2017
Citation
Guo, X, Gong, J, & Geng, L. "An Improved Continuum Damage Constitutive Model for Creep Deformation of Cast 20Cr32Ni1Nb Steel." Proceedings of the ASME 2017 Pressure Vessels and Piping Conference. Volume 5: High-Pressure Technology; ASME Nondestructive Evaluation, Diagnosis and Prognosis Division (NDPD); SPC Track for Senate. Waikoloa, Hawaii, USA. July 16–20, 2017. V005T11A014. ASME. https://doi.org/10.1115/PVP2017-65583
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