Microtomographic assessment of damage in P91 and E911 steels after long-term creep

Renversade, Loïc; Ruoff, Herbert; Maile, Karl; Sket, F.; Borbély, András

doi:10.3139/146.111056

Cited by 16 publications

(26 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Secondary phase (M23C6, Laves phase) don't have influence on cavity growth during creep expose [21]. As discussed in section Π part B, the cavity nucleation is dominant damage mechanism for high chromium steel under low stress.…”

Section: ) Exploring the Relationship Function Between Cavity Nucleamentioning

confidence: 97%

The interpretation of experimental observation date for the development of mechanisms based creep damage constitutive equations for high chromium steel

Xin

2015

2015 21st International Conference on Automation and Computing (ICAC)

View full text Add to dashboard Cite

It is very important to design a safe factor or estimating the remain lifetime for electric power plant components of steam pipes which mostly manufacture by high chromium steels and work at high temperature and low stress level. The author will develop the mechanisms based on creep damage constitutive equations for high chromium steel under lows stress in initial stage: (1) Creep cavities mostly formed attaching with the precipitation of Laves phase or on grain boundary for high chromium steel under low stress. The Laves phase should play an active role in the nucleation of creep cavities and suggest to explore the function between cavity nucleation and the evolution of Laves phase; (2) The dominant cavity nucleation mechanism is adapted to high chromium steels under low stress level;(3) Brittle intergranluar model is appropriate for high chromium steels at high temperature under low stress level; (4) High density number of cavity of crept test high chromium steel at high temperature under low stress could be as fracture criterion.

show abstract

Section: ) Exploring the Relationship Function Between Cavity Nucleamentioning

confidence: 97%

The interpretation of experimental observation date for the development of mechanisms based creep damage constitutive equations for high chromium steel

Xin

2015

2015 21st International Conference on Automation and Computing (ICAC)

View full text Add to dashboard Cite

show abstract

“…Based on qualitative analysis for 3D tomographic reconstructions of the distribution voids of E911 and P91 steel, a theoretically derived function of taking into account nucleation and growth of voids [1] was used to evaluate the experimental obtained histograms; the distribution equation (8) proposed by Riedel fitted well with the histogram density functions of void equivalent radius R of E911 and P91 [21], while the identical value of β = 1.95 AE 0.05 (closely to 2) is characterized for the constrained diffusional mechanism of void growth and α = 1 characterized for continuum cavity nucleation [21,22].…”

Section: Determination Of Cavitation Constantsmentioning

confidence: 99%

“…The creep cavitation constants for P91 [12]. The comparison of cavity size probability density function for P91, experimental data from ref [22] and only sample points used [12]. are also obtained, respectively.…”

Section: The Determination Of the Creep Cavitation Coefficientsmentioning

confidence: 99%

Modeling of Creep Deformation and Creep Fracture

Xu¹,

Lu²

2020

Strength of Materials

View full text Add to dashboard Cite

This chapter reports the recent progresses in (1) the development of a modified hyperbolic sine law able to depict the minimum creep strain rate over a wider range of stress levels; (2) the development of the creep fracture criterion and model based on the cavity area fraction along grain boundary calibrated with the most representative and comprehensive cavitation data obtained from X-ray synchrotron investigation; and (3) the development of mesoscopic composite approach modeling of creep deformation and creep damage. The first progress facilitates to overcome the difficulty in creep deformation modeling caused by stress breakdown phenomenon; the second progress is of a really scientifically sound and fundamental new approach, first in the world; the third progress provides the concept and tool, at the appropriate size scale, for the modeling of the creep deformation and creep fracture. They all contribute to the specific knowledge and new methodology to the topic area. Furthermore, it is expected that cavitation fracture modeling methodology reported here will find use in the analysis and modeling of other types of failure such as ductile and fatigue failure. This chapter presents an excellent example of interdisciplinary collaborative research and it advocates further such collaboration in its conclusion.

show abstract

“…Recently, synchrotron micro-tomography has been used to investigate the cavitation of high Cr steel [5][6][7], and continuous cavity nucleation and cavity growth models were calibrated by Xu et al [8] and an explicit creep fracture model, based on the coalescence of grain boundary cavities was derived [8]. The applicability of Xu's creep fracture lifetime model to a stress range of 120 MPa to 180 MPa and a lifetime of 2825 to 51,406 h, has been demonstrated with 87% of accuracy [9].…”

Section: Introductionmentioning

confidence: 99%

Development of the FE In-House Procedure for Creep Damage Simulation at Grain Boundary Level

2019

Metals

View full text Add to dashboard Cite

A two-dimensional (2D) finite element framework for creep damage simulation at the grain boundary level was developed and reported. The rationale for the paper was that creep damage, particularly creep rupture, for most high temperature alloys is due to the cavitation at the grain boundary level, hence there is a need for depicting such phenomenon. In this specific development of the creep damage simulation framework, the material is modeled by grain and GB (grain boundary), separately, where smeared-out grain boundary element is used. The mesh for grain and grain boundary is achieved by using Neper software. This paper includes (1) the computational framework, the existing subroutines, and method applied in this procedure; (2) the numerical and programming implementation of the GB; (3) the development and validation of the creep software; and (4) the application to simulate plane stress Copper–Antimony alloy. This paper contributes to the development of finite element simulation for creep damage/rupture at a more realistic grain boundary level and contributes to a new understanding of the intrinsic relationship of stress redistribution and creep fracture.

show abstract

Microtomographic assessment of damage in P91 and E911 steels after long-term creep

Cited by 16 publications

References 20 publications

The interpretation of experimental observation date for the development of mechanisms based creep damage constitutive equations for high chromium steel

The interpretation of experimental observation date for the development of mechanisms based creep damage constitutive equations for high chromium steel

Modeling of Creep Deformation and Creep Fracture

Development of the FE In-House Procedure for Creep Damage Simulation at Grain Boundary Level

Contact Info

Product

Resources

About