Fatigue and fracture of high-alloyed steel specimens subjected to purely thermal cycling

Fischer, F.D.; Rammerstorfer, F.G.; Bauer, František

doi:10.1007/bf02656578

Cited by 33 publications

(6 citation statements)

References 15 publications

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“…For the calculation, the boundary conditions 1100 • C and 0.1 s −1 were used. From comparing the single-phase flow curve of austenite with the peak stress from the literature, it is demonstrated that the peak stress of the duplex model in the present work overestimates the peak stress from the work of Iza-Mendia et al In the case of a ferrite flow curve, the steady-state stress calculated by the duplex model of the present work is higher than the stress calculated with the model of Iza-Mendia et al Moreover, the stress for low strains from the ferrite flow curves is as low as the yield stress in the measurements of Fischer et al [17]. Due to several unknown input parameters in the model, a sensitivity analysis was performed.…”

Section: Modelling Of Flow Curvescontrasting

confidence: 76%

Modelling of Hot Flow Stress of Duplex Steel in Dependence of Microstructure Using the Rule of Mixture

Quadfasel

Nietsch

Teller

2021

Metals

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The ferrite fraction and phase distribution of duplex steels depend strongly on the temperature evolution during hot deformation and are correlated to different mechanical behaviors during hot deformation as well as cold deformation. Therefore, the control of microstructure evolution during hot forming is relevant for target-oriented material design. In flow stress modelling for hot forming, the influence of microstructure beyond the ferrite fraction is often neglected. In the present work, a new method is demonstrated to also consider the influence of grain size in flow stress modelling. For this purpose, different initial microstructures with different ferrite fractions and phase distribution were tested in compression tests at 1100 °C and 0.1 s−1. The microstructure was analyzed before and after forming and it was observed that the differences in ferrite fractions vanished during the compression tests. Those microstructure data were used in a model including a rule of mixture and Hall–Petch relationship to extract the single-phase flow curves of ferrite and austenite. Based on the flow stress of the single phases, in combination with ferrite fraction and individual grain size, the flow curves of the different material conditions were calculated and the concurrent influence of ferrite fraction and phase distance on the mechanical behavior was discussed.

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Section: Modelling Of Flow Curvescontrasting

confidence: 76%

Modelling of Hot Flow Stress of Duplex Steel in Dependence of Microstructure Using the Rule of Mixture

Quadfasel

Nietsch

Teller

2021

Metals

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“…The generalized Hooke's law was then considered and the thermal-mechanical characteristics of the austenite and the ferrite were found in the literature. [24][25][26][27] For the austenite: is the temperature. The surface stress field resulting from mechanical polishing was numerically calculated by applying a biaxial stress state and a temperature field to the samples, 17 as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

A Mechanical–Electrochemical Approach for the Determination of Precursor Sites for Pitting Corrosion at the Microscale

Vignal¹,

Mary²,

Oltra³

et al. 2006

J. Electrochem. Soc.

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The influence of metallurgical defects and residual surface stresses generated by polishing on the pitting susceptibility of duplex stainless steels was studied by combining macro-and microelectrochemical measurements with thermal-mechanical simulation and metallography tests. It has been shown that pits initiate in both phases at metallurgical point defects ͑such as oxide inclusions in the ferrite and dislocation lines in the austenite͒. By contrast, the surface stress state was the driving force for pit initiation along the austenite/ferrite interface. Experiments at the macroscale revealed that this process represents about 40% of the total number of pits observed. It has been demonstrated that the local stress gradient was the key-parameter in pit initiation and that the local average stress was the parameter governing the transition from metastable to stable pitting.

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“…This speci®c structure results in a different behaviour under purely thermal cyclic loading of cylindrical specimens cut with their axis either parallel or perpendicular to the forging direction. Specimens of the former type exhibit an irreversible axial elongation after a full thermal cycle 900 C±20 C±900 C, while specimens of the latter type undergo an axial contraction, [2,3]. Specimens of austenitic or ferritic stainless steels of roughly the same composition demonstrate, in contrast, almost no residual strains under the same loading conditions, [2,3,4].…”

Section: Introductionmentioning

confidence: 86%

“…The main disadvantage of these plots encountered frequently is the absence of the ratchetting regime for purely thermal cycling as observed experimentally, e.g. [2]. In this case, the Bree diagram should degenerate to a one-dimensional single-axis representation of thermal loading conditions, with region boundaries marked as points on this axis.…”

Section: Shakedownmentioning

confidence: 97%

See 1 more Smart Citation

On material immanent ratchetting of two-phase materials under cyclic purely thermal loading

Silberschmidt¹,

Rammerstorfer

Werner³

et al. 1999

Archive of Applied Mechanics (Ingenieur Archiv)

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The paper analyses speci®c features of the response of two-phase materials with different thermomechanical properties of the phases to purely thermal cycling. It is shown that even without mechanical loading both shakedown and ratchetting regimes are possible. A short review is given of the phenomena and various models of shakedown and ratchetting under cyclic thermomechanical loading. Three structural models for the description of a special two-phase material, namely the duplex stainless steel, under purely thermal loading are discussed: a simple two-bar model, a composite cylinder model and micromechanical ®nite element models with duplex topologies. These models account for different features of the deformation process during thermal cycling and are used as basis for the analysis of thermal ratchetting. Results of numerical simulations are presented for various material conditions and modelling schemes.Conditions for material immanent ratchetting are derived and veri®ed by numerical experiments. It is shown that a temperature-dependence of the yield stresses of the two phases, which exhibits an intersection of the corresponding curves within the temperature interval of the cyclic thermal load, enforces this sort of ratchetting, lacking intersection of the yield stresstemperature curves indicates, on the other hand, a lesser or lacking tendency for material immanent ratchetting. Comparisons with results of laboratory experiment are also presented, and the tendencies derived from the micromechanical models are veri®ed.

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Fatigue and fracture of high-alloyed steel specimens subjected to purely thermal cycling

Cited by 33 publications

References 15 publications

Modelling of Hot Flow Stress of Duplex Steel in Dependence of Microstructure Using the Rule of Mixture

Modelling of Hot Flow Stress of Duplex Steel in Dependence of Microstructure Using the Rule of Mixture

A Mechanical–Electrochemical Approach for the Determination of Precursor Sites for Pitting Corrosion at the Microscale

On material immanent ratchetting of two-phase materials under cyclic purely thermal loading

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