The development of creep damage constitutive equations for high Cr steel

Xuming Zheng, Qiang Xu, Joan Lu, Xue Wang, XiQiao Feng

Research output: Contribution to journalArticle

Abstract

This paper reports 1) an application of the modified hyperbolic sine law to P92 for the minimum creep strain rate over a more extensive range of stress level, and 2) the calibration of the creep cavity fracture model based on cavity area fraction along grain boundaries and its applications to such as P92, E911 and MARBN alloys when applicable. This work was motivated by the need for the improvement of the existing sine law and mechanism-based creep rupture model and their successful applications to other alloys. The results include: (1) the calibration of creep cavity fracture model for E911, and the pre-required cavity nucleation and growth models, for E911, (2) the creep lifetime and stress relation coefficient U’ for P92, and (3) the relationship of the cavity nucleation rate coefficient A2 and stress level for MARBN-heat 1 cross-welds. This paper contributes to the specific knowledge to the individual topics as well as the proof of the suitability of the methodology to the creep damage research in general. It anticipates that the (creep) cavitation-based fracture modelling methodology will find its value and application in modelling other fractures such as ductile and fatigue.
Original languageEnglish
JournalMaterials at High Temperatures
Publication statusAccepted/In press - 6 Jan 2020

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Steel
constitutive equations
Constitutive equations
Creep
steels
damage
cavities
nucleation
methodology
Nucleation
coefficients
Calibration
cavitation flow
strain rate
grain boundaries
Cavitation
heat
life (durability)
Strain rate
Welds

Cite this

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title = "The development of creep damage constitutive equations for high Cr steel",
abstract = "This paper reports 1) an application of the modified hyperbolic sine law to P92 for the minimum creep strain rate over a more extensive range of stress level, and 2) the calibration of the creep cavity fracture model based on cavity area fraction along grain boundaries and its applications to such as P92, E911 and MARBN alloys when applicable. This work was motivated by the need for the improvement of the existing sine law and mechanism-based creep rupture model and their successful applications to other alloys. The results include: (1) the calibration of creep cavity fracture model for E911, and the pre-required cavity nucleation and growth models, for E911, (2) the creep lifetime and stress relation coefficient U’ for P92, and (3) the relationship of the cavity nucleation rate coefficient A2 and stress level for MARBN-heat 1 cross-welds. This paper contributes to the specific knowledge to the individual topics as well as the proof of the suitability of the methodology to the creep damage research in general. It anticipates that the (creep) cavitation-based fracture modelling methodology will find its value and application in modelling other fractures such as ductile and fatigue.",
keywords = "High Cr alloys, stress breakdown, minimum creep strain rate, cavity nucleation and growth, cavity area fraction along grain boundaries, creep damage",
author = "Xuming Zheng and Qiang Xu and Joan Lu and Xue Wang and XiQiao Feng",
year = "2020",
month = "1",
day = "6",
language = "English",
journal = "Materials at High Temperatures",
issn = "0960-3409",
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The development of creep damage constitutive equations for high Cr steel. / Zheng, Xuming; Xu, Qiang; Lu, Joan; Wang, Xue; Feng, XiQiao.

In: Materials at High Temperatures, 06.01.2020.

Research output: Contribution to journalArticle

TY - JOUR

T1 - The development of creep damage constitutive equations for high Cr steel

AU - Zheng, Xuming

AU - Xu, Qiang

AU - Lu, Joan

AU - Wang, Xue

AU - Feng, XiQiao

PY - 2020/1/6

Y1 - 2020/1/6

N2 - This paper reports 1) an application of the modified hyperbolic sine law to P92 for the minimum creep strain rate over a more extensive range of stress level, and 2) the calibration of the creep cavity fracture model based on cavity area fraction along grain boundaries and its applications to such as P92, E911 and MARBN alloys when applicable. This work was motivated by the need for the improvement of the existing sine law and mechanism-based creep rupture model and their successful applications to other alloys. The results include: (1) the calibration of creep cavity fracture model for E911, and the pre-required cavity nucleation and growth models, for E911, (2) the creep lifetime and stress relation coefficient U’ for P92, and (3) the relationship of the cavity nucleation rate coefficient A2 and stress level for MARBN-heat 1 cross-welds. This paper contributes to the specific knowledge to the individual topics as well as the proof of the suitability of the methodology to the creep damage research in general. It anticipates that the (creep) cavitation-based fracture modelling methodology will find its value and application in modelling other fractures such as ductile and fatigue.

AB - This paper reports 1) an application of the modified hyperbolic sine law to P92 for the minimum creep strain rate over a more extensive range of stress level, and 2) the calibration of the creep cavity fracture model based on cavity area fraction along grain boundaries and its applications to such as P92, E911 and MARBN alloys when applicable. This work was motivated by the need for the improvement of the existing sine law and mechanism-based creep rupture model and their successful applications to other alloys. The results include: (1) the calibration of creep cavity fracture model for E911, and the pre-required cavity nucleation and growth models, for E911, (2) the creep lifetime and stress relation coefficient U’ for P92, and (3) the relationship of the cavity nucleation rate coefficient A2 and stress level for MARBN-heat 1 cross-welds. This paper contributes to the specific knowledge to the individual topics as well as the proof of the suitability of the methodology to the creep damage research in general. It anticipates that the (creep) cavitation-based fracture modelling methodology will find its value and application in modelling other fractures such as ductile and fatigue.

KW - High Cr alloys

KW - stress breakdown

KW - minimum creep strain rate

KW - cavity nucleation and growth

KW - cavity area fraction along grain boundaries

KW - creep damage

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JO - Materials at High Temperatures

JF - Materials at High Temperatures

SN - 0960-3409

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