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

Nicola Stefani, Olga Bylya, Aleksey Reshetov, Paul Blackwell

Research output: Contribution to journal › Conference Contribution

2 Citations (Scopus)

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 industrial 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.
LanguageEnglish
Pages59-68
Number of pages10
JournalComputer Methods in Materials Science
Volume17
Issue number1
Publication statusPublished - 15 Jan 2017

Fingerprint

Microstructural evolution
Forging
Superalloys
Nickel
Physical properties
Mechanical properties
Microstructure
Geometry

Keywords

  • Inconel 718®
  • hot forging
  • microstructure modelling
  • JMAK
  • superalloys
  • microstructural evolution phenomena
  • recrystallisation
  • industrial production environment
  • screw press forging
  • Johnson-Mehl-Avrami-Kolmogorov type model

Cite this

Stefani, Nicola ; Bylya, Olga ; Reshetov, Aleksey ; Blackwell, Paul. / On the applicability of JMAK-type models in predicting IN718 microstructural evolution. In: Computer Methods in Materials Science. 2017 ; Vol. 17, No. 1. pp. 59-68.
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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 industrial 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{\circledR} 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.",
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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, vol. 17, no. 1, pp. 59-68.

On the applicability of JMAK-type models in predicting IN718 microstructural evolution. / Stefani, Nicola; Bylya, Olga; Reshetov, Aleksey; Blackwell, Paul.

In: Computer Methods in Materials Science, Vol. 17, No. 1, 15.01.2017, p. 59-68.

Research output: Contribution to journal › Conference Contribution

TY - JOUR

T1 - On the applicability of JMAK-type models in predicting IN718 microstructural evolution

AU - Stefani, Nicola

AU - Bylya, Olga

AU - Reshetov, Aleksey

AU - Blackwell, Paul

PY - 2017/1/15

Y1 - 2017/1/15

N2 - 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 industrial 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.

AB - 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 industrial 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.

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KW - recrystallisation

KW - industrial production environment

KW - screw press forging

KW - Johnson-Mehl-Avrami-Kolmogorov type model

UR - http://www.cmms.agh.edu.pl/

M3 - Conference Contribution

VL - 17

SP - 59

EP - 68

JO - Computer Methods in Materials Science

T2 - Computer Methods in Materials Science

JF - Computer Methods in Materials Science

SN - 1641-8581

IS - 1

ER -

Stefani N, Bylya O, Reshetov A, Blackwell P. On the applicability of JMAK-type models in predicting IN718 microstructural evolution. Computer Methods in Materials Science. 2017 Jan 15;17(1):59-68.

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