FEM simulation of microstructure refinement during severe deformation

Bylya, Olga I.; Sarangi, M.K.; Овчинникова, Н.В.; Васин, Р. А.; Yakushina, E.; Blackwell, Paul

doi:10.1088/1757-899x/63/1/012033

Cited by 7 publications

(8 citation statements)

References 15 publications

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“…5 [11]: As can be seen from Eq. 5, the RX grain size calculation is based on the accumulated plastic work of deformation, which is usable parameter for FEA simulations due to its stable, integral nature.…”

Section: Recrystallisation (Rx) Model a Modified Jmak (Johnson-mehl-mentioning

confidence: 85%

See 1 more Smart Citation

Modelling Microstructure Evolution in ATI 718Plus<sup>®</sup> Alloy

Reshetov¹,

Bylja²,

Gzyl

et al. 2016

KEM

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Abstract. The present study details the results of finite element analysis (FEA) based predictions for microstructure evolution in ATI 718Plus ® alloy during the hot deformation process. A detailed description of models for static grain growth and recrystallisation is provided. The simulated average grain size is compared with those experimentally measured in aerofoil parts after trials. The proposed modified JMAK model has proved to be valid in the main body of the extruded part. The results predicted for the surface are less accurate. The recrystallised grain size on the surface is smaller than in the centre of the part which corresponds to the experimental results and reflects the main trend.

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Section: Recrystallisation (Rx) Model a Modified Jmak (Johnson-mehl-mentioning

confidence: 85%

“…5 indirectly through the flow stress function. A more detailed description of the approach is given in [11].…”

Section: Recrystallisation (Rx) Model a Modified Jmak (Johnson-mehl-mentioning

confidence: 99%

Modelling Microstructure Evolution in ATI 718Plus<sup>®</sup> Alloy

Reshetov¹,

Bylja²,

Gzyl

et al. 2016

KEM

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“…To attempt to rectify these deficiencies, the equation for D RX can be written as in the form of [15]:…”

Section: The Average Grain Size Of New Rx Grains Dmentioning

confidence: 99%

An Approach to Microstructure Modelling in Nickel Based Superalloys

Blackwell¹,

Bylya²,

Reshetov³

et al. 2016

Proceedings of the 13th International Symposium on Superalloys

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Mechanical properties of components made from nickel based superalloys rely on the microstructure that forms during their thermomechanical processing. The ability for predicting and controlling microstructure during the processing is of the utmost importance for this class of alloys. In this work, the applicability of JMAK-type (Johnson-Mehl-Avrami-Kolmogorov) models is studied in the context of industrial manufacturing processes. The results of FEA (finite element analysis) based predictions of microstructure evolution in ATI 718Plus ® alloy during the hot deformation process are presented. The limitations of the JMAKtype approach are discussed in the paper and concepts for an alternative modelling approach for microstructure prediction in nickel based superalloys are presented.

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“…The structural parameter D, reflecting the state of the microstructural refinement, is included in the macroscopic constitutive equation (3). The parameters A, m, Q and k in this equation are dynamic ones and depend on temperature and strain rate, more details see in [9]. For elevated temperatures (>0.3Tm) the value of the parameter k often becomes positive (inverse Hall-Petch effect).…”

Section: The Accounting Of the Softening Effect In Fem Simulationsmentioning

confidence: 99%

Simulation Of The Material Softening During Hot Metal Forming

Bylya¹,

Sarangi²,

Rohit³

et al. 2015

Archives of Metallurgy and Materials

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Deformation softening is quite often observed during hot working of different alloys. Steels, aluminium, titanium or nickel alloys can demonstrate a decrease in flow stress under active deformation at constant temperatures and strain rates. Though the background microstructural mechanisms as well as the softening rates can be quite different, the treatment of such processes requires special attention. Deformation softening can cause significant non-uniformity of the metal flow resulting in flow localization, formation of shear bands and variation of the microstructure across the workpiece. This paper is devoted to the investigation of the specific issues which arise in this respect in FEM simulation of processes involving softening. The possible role of softening in shear band formation is studied using numerical simulation and physical modelling. The effect of the softening rate on the probability of flow localization is discussed. The interplay of deformation softening with the stain rate and temperature sensitivity is demonstrated using as an example the simulation of Equal Channel Angular Pressing (ECAP). An approach to account for the deformation softening in FEM simulations via process modelling of the microstructure refinement is proposed.

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FEM simulation of microstructure refinement during severe deformation

Cited by 7 publications

References 15 publications

Modelling Microstructure Evolution in ATI 718Plus<sup>®</sup> Alloy

Modelling Microstructure Evolution in ATI 718Plus<sup>®</sup> Alloy

An Approach to Microstructure Modelling in Nickel Based Superalloys

Simulation Of The Material Softening During Hot Metal Forming

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