Abstract
Language | English |
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Pages | 59-68 |
Number of pages | 10 |
Journal | Computer Methods in Materials Science |
Volume | 17 |
Issue number | 1 |
Publication status | Published - 15 Jan 2017 |
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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
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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.
KW - Inconel 718®
KW - hot forging
KW - microstructure modelling
KW - JMAK
KW - superalloys
KW - microstructural evolution phenomena
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 -