High temperature low cycle fatigue behaviour of a martensitic forging tool steel

Bernhart, Gérard; Moulinier, G; Brucelle, Olivier; Delagnes, Denis

doi:10.1016/s0142-1123(98)00064-4

Cited by 49 publications

(50 citation statements)

References 8 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…4) (cf. Bernhart et al, 1999;Mebarki et al, 2004). The first phase is generally explained by a rapid change in the dislocation density inherited from the quench treatment, the second is related to the formation of dislocation sub-structure and carbide coarsening under the action of time, temperature and cyclic load, while the third phase is a consequence of micro-damage development in the material that ultimately causes failure of the tested sample (cf.…”

Section: Materials Behaviourmentioning

confidence: 99%

Modeling of cyclic thermo-elastic-plastic behaviour of P91 steel

Sulich

Egner

Mroziński

et al. 2017

jtam

View full text Add to dashboard Cite

Thermomechanical low cycle fatigue behaviour of P91 steel used in power industry applications has been extensively investigated. The constitutive model of Armstrong-Frederick, extended with temperature rate effects, has been applied to describe the behaviour of the thermo-elastic-plastic material. The proposed model has been successfully implemented in simulation of low cycle fatigue of the examined steel in two different temperatures.

show abstract

Section: Materials Behaviourmentioning

confidence: 99%

Modeling of cyclic thermo-elastic-plastic behaviour of P91 steel

Sulich

Egner

Mroziński

et al. 2017

jtam

View full text Add to dashboard Cite

show abstract

“…Multiaxial Chaboche model has also been used by Koo and Kwon [3] and Zhang et al [18] for cyclic plasticity modelling of martensitic steels. Bernhart et al [19] implemented isotropic hardening strain memory effect within multiaxial Chaboche model for forging tool steel. In common, these constitutive models have first order differential equations which include material parameters for time-dependent stress-strain behaviour.…”

Section: Introductionmentioning

confidence: 99%

Determination of material parameters for a unified viscoplasticity-damage model for a P91 power plant steel

Kyaw

Rouse

et al. 2016

International Journal of Mechanical Sciences

View full text Add to dashboard Cite

The version presented here may differ from the published version or from the version of record. If you wish to cite this item you are advised to consult the publisher's version. Please see the repository url above for details on accessing the published version and note that access may require a subscription. AbstractSocietal pressures are mounting on electricity operators to operate traditional fossil-fuel power plants in an efficient and flexible manner in conjunction with renewable power plants. This requires the uses of high frequency start up -shut down load profiles in order to better match market demands. As such, high temperature/pressure components such as steam pipe sections and headers experience fluctuating mechanical and thermal loads. There is therefore an industrial need for the accurate prediction of fatigue and creep damage in order to estimate remnant component life. In the present work, a continuum damage model has been coupled with a Chaboche unified viscoplastic constitutive model in order to predict stress-strain behaviour of a P91 martensitic steel (a material used for power plant steam pipes) due to cyclic plasticity and damage accumulation. The experimental data used here are from the previous work [1]. Cyclic fully reversed strain controlled experiments (±0.4%, ±0.25% and ±0.2% strain ranges) and cyclic test with a dwell period (±0.5% strain ranges) for a P91 martensitic steel under isothermal conditions (600°C) are utilised. The physically relevant material parameters are determined and optimised using experimental results. Although many material parameter identification procedures can be found in the literature [1][2][3][4][5][6], there are uncertainties in determining the limits for the parameters used in the optimisation procedure. This could result in unrealistic parameters while optimising using experimental data. The issue is addressed here by using additional dwell test to identify the limits for stress relaxation parameters before using Cottrell's stress partition method to identify the limits for strain hardening parameters. Accumulated stored energy for damage initiation criterion and damage evolution parameters are also extracted from the experimental results. The estimated failure lifetimes for ±0.4%, ±0.25% and ±0.2% cases are 1600, 4250 and 9500 cycles, respectively, as opposed to 1424, 3522 and 10512 cycles as given by experiments.

show abstract

“…The steel generally exhibits cyclic softening behaviour as the peak stresses decrease as the number of cycles increases [11,12]. The application of cyclic mechanical loading of P91 steel at high temperature causes microstructural and damage evolution throughout the material's life cycles.…”

Section: Introductionmentioning

confidence: 99%

A study on the damage evolution of P91 steel under cyclic loading at high temperature

Saad¹,

Bachok²,

Sun³

2016

Int. J. Automot. Mech. Eng.

View full text Add to dashboard Cite

This study aimed to investigate the effect of cyclic loading on structural integrity of a P91 specimen at high temperature. The experiments were conducted using a thermomechanical fatigue test machine at 600 °C and electron microscopy investigation. The evolution of the elastic modulus can be used as an indication of the strength degradation of the material. Scanning and transmission electron microscopy were used to investigate the microstructural variations that occurred in the specimen at different life fractions during the cyclic tests. Based on the experimental stress-strain data, variations in the Young's modulus and the area enclosed in the hysteresis loops were determined, together with the variations in other parameters throughout the test. The initiation of cracks begins in the second stage of cyclic softening. The changes of structure, on a micro-scale, do not significantly affect the strength of the specimen, as the Young's modulus values of the specimen remain approximately constant up to the end of the stage 2 cyclic softening before damage to the specimen starts to increase. The cracks cause the material to become weaker, as indicated by the decrease of the Young's modulus value. The evolution of damage was found to be significant in the final stages of softening owing to the propagation of cracks in the P91 steel affecting the integrity of the material.

show abstract

High temperature low cycle fatigue behaviour of a martensitic forging tool steel

Cited by 49 publications

References 8 publications

Modeling of cyclic thermo-elastic-plastic behaviour of P91 steel

Modeling of cyclic thermo-elastic-plastic behaviour of P91 steel

Determination of material parameters for a unified viscoplasticity-damage model for a P91 power plant steel

A study on the damage evolution of P91 steel under cyclic loading at high temperature

Contact Info

Product

Resources

About