Deformation behaviour of a ferritic hot-work tool steel with respect to the microstructure

Krumphals, Friedrich; Reggiani, Barbara; Donati, Lorenzo; Wlanis, Thomas; Sommitsch, Christof

doi:10.1016/j.commatsci.2011.03.047

Cited by 11 publications

(4 citation statements)

References 16 publications

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“…The microstructure exhibits a high density of dislocations, which gives a good strength to the steel at room temperature. Many investigations have clearly shown that the steel is highly prone to cyclic softening [49][50][51]. In addition, The Low Cycle fatigue (LCF) experiments have shown a significant softening for the first hundred cycles following a linear continuous softening until the rupture.…”

Section: Methodsmentioning

confidence: 99%

A multi-scale approach to investigate the nonlinear subsurface behavior and strain localization of X38CrMoV5-1 martensitic tool steel: Experiment and numerical analysis

Zouaghi

Velay

Soveja

et al. 2016

International Journal of Plasticity

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The cyclic mechanical behavior, the wear and fatigue resistances and damage developments of working surface of tool steels are dependent on microstructural features. A multi-scale approach combining experimental testing, numerical treatments and simulations is developed to model the surface behavior of X38CrMoV5-1 martensitic tool steels. The multi-scale modeling is coupled with finite element calculations. The elasto-viscoplastic constitutive equations used are based on crystal plasticity model of Méric-Cailletaud and are implemented on the finite element code ABAQUS under a small strain assumption. Trough an appropriate laboratory testing, the microstructure features comparable to the surface of industrial tools or pin/disc in tribology experiments are reproduced by considering plate specimens. Monotonic tensile testing is coupled with in-situ Digital Image Correlation technique (DIC) to determine the surface strain fields. The measured local nonlinear mechanical strain fields are analyzed. The strain localization is related to stereological artifacts. The numerical treatments allow reproducing, qualitatively, the strain localization patterns at the surface observed during tensile testing. The influence of the various stereological parameters such as the morphology of martensitic laths, the crystallographic orientations, the internal hardening state of the surface profiles and their evolutions on the local strain fields are addressed. By such approach, it is possible to get a better insight of some elementary mechanisms acting on tools and/or pin/disc surfaces regarding both tensile and cyclic behavior.

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Section: Methodsmentioning

confidence: 99%

A multi-scale approach to investigate the nonlinear subsurface behavior and strain localization of X38CrMoV5-1 martensitic tool steel: Experiment and numerical analysis

Zouaghi

Velay

Soveja

et al. 2016

International Journal of Plasticity

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“…The above relationship allows for the possibility to directly compute the fracture times at a given σ -T combination from the following: To describe the microstructure evolution during thermo-mechanical loading via a physical based approach and to compare it with phenomenological predictions, precipitation kinetics simulations as well as a dislocation density model for thermal creep using the rate theory, were applied to characterize the hardening and softening behaviour in a complex hot work tool steel 87 .…”

Section: Measures Of Estimating Creep Life In Steels : a Critical Reviewmentioning

confidence: 99%

“…al. 91 to describe hardening softening behaviour of complex hot working tool steel. In the study the microstructure evolution during the thermomechanical loading described by a physical based approach was compared with phenomenological predictions , simulations of prcipitation kinetics as well as dislocation density model using creep rate theory.…”

Section: D~smentioning

confidence: 99%

3D creep cavitation characteristics and residual life assessment in high temperature steels: A critical review

Gupta

Toda

Mayr

et al. 2015

Materials Science and Technology

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The paper seeks to assess critically the need for a new paradigm in creep life estimation of service exposed steels and provide possible new directions of residual life assessment, in the light of a decade of explosive application of micro-tomography on structural materials to characterise the 3D nature of cavitation damage. The phenomenon of creep failure using synchrotron micro-tomography (SR-µCT) has been studied at large synchrotron sources where imaging on conventional structural materials such as steels with high absorption to X-rays has been realized. The unique feature of the SR-µCT studies is the direct imaging in 3D of cavitation present in the bulk (hundreds of micrometers in size), revealing the spatial characteristics and morphology of the creep voids. Further the quantitative analyses of cavitation characteristics contained in the 3D datasets, which when scaled with time, stress and temperature provides functional information amenable for developing constitutive equations for creep fracture. These being based on SR-µCT, which due to its non-destructive feature provides high fidelity data that significantly reduces the ambiguity in the development of the functional relationships related to creep failure. Thus the use of such constitutive equations in an explicit manner to estimate the residual life of the components affected by creep and the consequent assessment of structural integrity would prove invaluable. This paper summarizes the studies related to creep in materials using micro-tomography with special emphasis on a 10.86%Cr heat resistant steel to show the type of data available which could be relevant for life assessment and design against creep failure. A brief discussion of the existing methods of residual life estimations in the light of the availability of the 3D micro-tomography data available in recent literature follows. Finally the possible new directions of using the microtomography data to formulate advanced residual life estimation methods are briefly touched.

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“…The physical and numerical simulation of metal processing techniques is still an important tool for design and development of required products, such as predicting the microstructure and subsequent properties of the component [1][2][3][4]. Accurate prediction of the grain size due to hardening and softening processes is very helpful in the improvement of the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Physical and Numerical Simulations of the Microstructure Evolution in AA6082 during Friction Stir Processing by Means of Hot Torsion and FEM

Krumphals

Gao

Zamani

et al. 2013

MSF

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A reproduction of the conditions occurring during friction stir processing, where a fine grained structure according to the process parameters rpm, transverse speed and pressure develops is the main focus in the present work. To physically simulate such a friction stir process, hot torsion tests at constant temperatures were carried out in a Gleeble ® 3800 machine at different strains and strain rates. The specimens were immediately water quenched after hot deformation to avoid any static recrystallization. The microstructure was investigated to characterize the grain size evolution and misorientation as a function of the local strain, strain rate and temperature. Dynamic recovery was observed followed by continuous dynamic recrystallization at large deformations. By means of DEFORMTM3D the occurring strain, strain rate and temperature distributions, which are decisive for the observed microstructure evolution, were evaluated.

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Deformation behaviour of a ferritic hot-work tool steel with respect to the microstructure

Cited by 11 publications

References 16 publications

A multi-scale approach to investigate the nonlinear subsurface behavior and strain localization of X38CrMoV5-1 martensitic tool steel: Experiment and numerical analysis

A multi-scale approach to investigate the nonlinear subsurface behavior and strain localization of X38CrMoV5-1 martensitic tool steel: Experiment and numerical analysis

3D creep cavitation characteristics and residual life assessment in high temperature steels: A critical review

Physical and Numerical Simulations of the Microstructure Evolution in AA6082 during Friction Stir Processing by Means of Hot Torsion and FEM

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