Phase Field Modeling of the Microstructure Evolution in a Steel Workpiece under High Temperature Gradients

Klocke, Fritz; Mohammadnejad, M.; Hess, R.; Harst, Simon; Klink, Andreas

doi:10.1016/j.procir.2018.05.079

Cited by 11 publications

(11 citation statements)

References 16 publications

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“…Additionally, a refined model for the material modification will be developed with the aim to identify the most suitable descriptives of the internal material load for Process Signatures. First approaches were already obtained and published by Klocke et al [25].…”

Section: Exemplary Process Signature Componentmentioning

confidence: 99%

Underlying Mechanisms for Developing Process Signatures in Manufacturing

et al. 2018

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The concept of Process Signatures allows the reliable and knowledge-based prediction of material modifications (e.g., changes of hardness, residual stress, microstructure and chemical composition) researchers in the field of surface integrity, and manufacturing technologies have already been seeking for a long time. A Process Signature is based on the correlation between the internal material loads in manufacturing processes (e.g., stress, strain, temperature) and the resulting material modifications. The target of this paper is to get a comprehensive view on the development of single Process Signature Components for processes with different predominant impacts. Particularly, a mechanism-based approach leading to significant descriptives of internal material loads for a specific material modification is proposed. By this, a deeper understanding of the underlying mechanisms leading to changes of the workpiece surface layer properties caused by manufacturing processes is provided. The challenging identification of significant mechanisms and descriptives of internal material loads is highlighted for each process, and supporting measurement methods and modeling approaches are presented. Process Signatures are expected to enable the solution of the so-called inverse problem in manufacturing.

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Section: Exemplary Process Signature Componentmentioning

confidence: 99%

Underlying Mechanisms for Developing Process Signatures in Manufacturing

et al. 2018

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“…The literature [9][10][11][12] emphasizes the key influence of the type of used dielectric on the properties of the surface layer. This is related to the physical properties of the dielectric, which determine the possibility of electrical discharges, the ability to extinguish the arc and cooling and solidification of evaporated or melted material, removal of erosion products from the treatment zone, as well as heat dissipation from the workpiece and electrode [9][10][11][12][13][14][15][16]. It should be also pointed that the thermal and electrical character of EDM implies the need to pay special attention to the thermal and electrical properties of the machined materials.…”

Section: Introductionmentioning

confidence: 99%

Primary research on influence of workpiece cooling on efficiency of Inconel’s 625 alloy elecrodischarge milling in carbon dioxide

Żyra

Skoczypiec

2022

J. Phys.: Conf. Ser.

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Inconel alloys one of the most cost intensive materials to machine with conventional machining methods. It is connected with its mechanical properties, as well as low thermal conductivity and also high material losses during machining. An alternative to conventional machining is electrodischarge machining (EDM), which enables to machine all the materials which are conductors or semi-conductors regardless its chemical composition and mechanical properties. There are three main dielectric types which can be used for EDM machining. The eco-friendly are gaseous ones. It is still hard to use gaseous dielectrics in the industrial applications, however it seems that this dielectrics are the future. The main aim of this research was to determine an influence of EDM milling in carbon dioxide used as dielectric in two configurations – with and without external workpiece cooling with deionized water on the EDM technological parameters (material removal rate, electrode wear) as well as technological surface integrity and surface structure.

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“…Hence, the process of crystal growth and nucleation is classified as micro-scale modeling. 6,12,13 Spherulite growth investigation through micro-scale modeling enhances the understanding of crystallization behavior for polymer materials. For semi-crystalline polymers, crystalline and amorphous phases are present in the microstructure of the material.…”

Section: Introductionmentioning

confidence: 99%

“…To date, numerous phase-field models have been developed to investigate the crystallization behavior of polymer materials. 6,12,13,[18][19][20][21] This method differentiates the phase state during crystallization, with any sharp interface between the two phases to be treated as a diffused interface. 20 Also known as phenomenological phase-field modeling, the anisotropic growth of the polymer crystal can be simulated with an empirical anisotropic function.…”

Section: Introductionmentioning

confidence: 99%

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Investigation of polyamide 12 isothermal crystallization through the application of the phase‐field model

Teo

Tran

Chen

et al. 2022

Polymers for Advanced Techs

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Crystallization of polyamide 12 (PA12) is an essential process requiring thorough investigation for evaluating the mechanical properties after the polymer parts are manufactured. The change in crystallization temperature results in different crystallization behaviors for PA12. Hence, the crystal morphology of PA12 achieved provides important information about crystallization behavior, especially for those produced through additive manufacturing due to its heterogenous cooling rate in a single print bed. Considering the need of investigating PA12 crystallization using phase‐field modeling, this paper aims to simulate the spherulite morphology of PA12 undergoing isothermal crystallization. This model is compared with the spherulite morphologies obtained from the optical microscopy test. The model shows that PA12 spherulites have thicker dendrites when the isothermal temperature is higher. The present phase‐field model can determine the spherulite morphologies of bulk printed PA12 based on the crystallization condition and be used to evaluate the properties of the printed part.

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Phase Field Modeling of the Microstructure Evolution in a Steel Workpiece under High Temperature Gradients

Cited by 11 publications

References 16 publications

Underlying Mechanisms for Developing Process Signatures in Manufacturing

Underlying Mechanisms for Developing Process Signatures in Manufacturing

Primary research on influence of workpiece cooling on efficiency of Inconel’s 625 alloy elecrodischarge milling in carbon dioxide

Investigation of polyamide 12 isothermal crystallization through the application of the phase‐field model

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