On the applicability of JMAK-type models in predicting IN718 microstructural evolution

Nicola Stefani¹, Olga Bylya², Aleksey Reshetov², Paul Blackwell²

¹Department of Design, Manufacture and Engineering Management, University of Strathclyde, 75 Montrose Street, Glasgow, G1 1XJ, United Kingdom.

²Advanced Forming Research Centre, University of Strathclyde, 85 Inchinnan Drive, Inchinnan, Renfrewshire, PA4 9LJ, United Kingdom.

DOI:

https://doi.org/10.7494/cmms.2017.1.0576

Abstract:

Nickel-based superalloys are widely used in the aerospace sector for their mechanical properties, which are directly related to the microstructural and physical properties of these materials. JMAK-type models have been applied to this class of superalloys for the prediction of microstructural evolution phenomena such as recrystallisation. However, these models often lack a clear range of applicability. The majority of the successful applications normally address rather idealised processes (relatively slow forging, simple geometry). However, the real-world production environment generally involves complex strain paths and thermal histories. Thus, there arises the question of whether the JMAK-type models can be applied to such cases. This paper’s research focus is to investigate the applicability of JMAK-type models for such processes. To do this, screw press forging of disks was used to validate the in-built JMAK-type model of Inconel 718® available in DEFORMTM. In particular, the applicability of the model was examined using a comparison between the results from simulation and from metallographic analysis. At first, the appropriateness of the JMAK outputs in describing the observed microstructures was investigated and then quantitative results were evaluated. The model’s outputs were found to be insufficient in describing the observed microstructural states and additional parameters were deemed necessary. The model’s predictions ranged from a broadly good match, for which the model could be calibrated with a proposed new methodology, to a qualitative mismatch that highlights the limits of the model’s applicability.

Cite as:

Stefani, N., Bylya, O., Reshetov, A., Blackwell, P. (2017). On the applicability of JMAK-type models in predicting IN718 microstructural evolution. Computer Methods in Materials Science, 17(1), 59 – 68. https://doi.org/10.7494/cmms.2017.1.0576

Article (PDF):

Keywords:

Inconel 718R, Hot Forging, Microstructure Modelling, JMAK

References:

ASTM E112-13, 2014, Standard Test Methods for DeterminingAverage Grain Size, ASTM International, 1-28.

Avrami, M., 1941, Granulation, Phase Change, andMicrostructure Kinetics of Phase Change. III, TheJournal of Chemical Physics, 9(2), 177.

Avrami, M., 1940, Kinetics of Phase Change. II -Transformation-Time Relations for Random Distributionof Nuclei, Journal of Chemical Physics, 8(1940), 212-224.

Avrami, M., 1939, Kinetics of phase change. I general theory,The Journal of Chemical Physics, 7(12), 1103.

Brand, A. J., Karhausen, K., Kopp, R., 1996, Microstructuralsimulation of nickel base alloy Incone* 718 in productionof turbine discs, Materials Science and Technology,12(11), 963-969.

DEFORMTM, 2014, DEFORMTM V11.0.1 SystemDocumentation, Reed Road Columbus, Ohio: ScientificForming Technologies Corporation.Hallberg, H., 2011, Approaches to Modeling ofRecrystallization, Metals, 1(1), 16-48.

Huang, D., Wu, W.T., Lambert, D., S. L. Semiatin, 2001,Computer simulation of microstructure evolution duringhot forging of Waspaloy and nickel alloy 718, Proc.Microstruct. Model. Predict. Dur. thermomechanicalProcess. TMS, eds, R. Srinivasan, S.L. Semiatin, A.Beaudoin, S. Fox, Z. Jin, Indianapolis (Indiana), 137-146.

Huber, D., Stotter, C., Sommitsch, C., Mitsche, S., Poelt, P.,Buchmayr, B., Stockinger, M., 2008, Microstructuremodeling of the dynamic recrystallization kinetics duringturbine disc forging of the nickel based superalloy Allvac718PlusTM, Superalloys 2008, 855-861.

Humphreys, F.J., Hatherly, M., 2004, Recrystallization andrelated annealing phenomena, Elsevier, Amsterdam.Johnson, W., Mehl, R., 1939, Reaction kinetics in processes ofnucleation and growth. Transactions of the AmericanInstitute of Mining and Metallurgical Engineers, (135),416-458.

Kolmogorov, A.N., 1937, On the Statistical Theory of theCrystallization of Metals, Bulletin of the Academy ofSciences of the USSR, 1(Mathematics Series), 355-359.

Medeiros, S.C., Prasad, Y.V.R.K., Frazies, W.G., Srinivasan, R.,2000, Microstructural modeling of metadynamicrecrystallization in hot working of IN 718 superalloy,Materials Science and Engineering A, 293(1), 198-207.

Micas Simulation LTD, QFORM v8 FE packagedocumentation: Description of Microstructure evolutionmodel, Available at: http://www.qform3d.co.uk/db_files/17/123.pdf [Accessed September 1, 2016].

Mirzadeh, H., Najafizadeh, A., Moazeny, M., 2009, Flow curveanalysis of 17-4 PH stainless steel under hot compressiontest, Metallurgical and Materials Transactions A:Physical Metallurgy and Materials Science, 40(12),2950-2958.

Na, Y.S., Teom, J.T., Park, N.K., Lee, J.Y., 2003. Simulation ofmicrostructures for Alloy 718 blade forging using 3DFEM simulator, Journal of Materials ProcessingTechnology, 141(3), 337-342.

Prasad, Y.V.R.K., Rao, K.P., Sasidhara, S., 1997, Hot WorkingGuide: A Compendium of Processing Maps Second Edi.,ASM International, Materials Park (Ohio).

Reshetov, A., Bylya, O., Stefani, N., Rosochowska, M.,Blackwell, P., 2016, An Approach To MicrostructureModelling In Nickel Based Superalloys, TMS 13thInternational Symposium on Superalloys, eds., M. Hardy,E. Huron, U. Glatzel, B. Griffin, B. Lewis, C. Rae, V.Seetharaman, S. Ti, Seven Springs (Pennsylvania), 531-538.

Sellars, C.M., Whiteman, J. A., 1979, Recrystallization andgrain growth in hot rolling, Metal Science, 13(April),187–194.

Sims, C.T., 1984, A History of Superalloy Metallurgy forSuperalloy Metallurgists, Superalloys 1984 (FifthInternational Symposium), ed., M. Gel, 399-419.

Sui, F.L., Xu, L.X., Chen, L.Q., Liu, X.H., 2011, Processingmap for hot working of Inconel 718 alloy, Journal ofMaterials Processing Technology, 211(3), 433-440.

Zhang, J.M., Gao, Z.Y., Zhuang, J.Y., Zhong, Z.Y., 1999,Mathematical modeling of the hot-deformation behaviorof superalloy IN718, Metallurgical and MaterialsTransactions A, 30(10), 2701-1712.