Applicability of JMAK-type model for predicting microstructural evolution in nickel-based superalloys

Research output: Contribution to journalConference Contribution

Abstract

The question of the prediction of microstructural transformation over a wide range of temperatures and strain rates is important for the simulation of industrial hot forging processes, especially those focused on net-shape forging. A large spectrum of microstructural models, from the simplest empirical and phenomenological forms to more complex physics-based ones were developed during last century; some of them were embedded into commercial software. However, in spite of some successful implementations, the problem of the robust prediction of microstructure development in the real multi-operational industrial processes remains in general unsolved. Complex models often suffer due to high computational cost, possible mathematical instability and ill-defined calibration techniques. Simple models are easier for practical use but, due to the nature of the simplifying assumptions, have a limited range of validity, which is almost never specified. JMAK-type models are one of the examples of the relatively simple mathematical model forms popular for the description a number of metallurgical processes. One of them is recrystallisation, which is one of the dominating mechanisms in the hot working of metals. In this paper, the wellknown family of 718 nickel-base superalloys and a range of forging trials of different levels of complexity were used to analyze the applicability of the JMAK-type models.
LanguageEnglish
Number of pages7
JournalProcedia Engineering
Publication statusAccepted/In press - 22 May 2017

Fingerprint

Microstructural evolution
Superalloys
Nickel
Forging
Hot working
Strain rate
Physics
Calibration
Mathematical models
Microstructure
Metals
Costs
Temperature

Keywords

  • microstructural modelling, JMAK-type model, Nickel superalloys,
  • validity analysis
  • nickel superalloys

Cite this

@article{c15a75e8c33b4be6ad231a4b9bbca36a,
title = "Applicability of JMAK-type model for predicting microstructural evolution in nickel-based superalloys",
abstract = "The question of the prediction of microstructural transformation over a wide range of temperatures and strain rates is important for the simulation of industrial hot forging processes, especially those focused on net-shape forging. A large spectrum of microstructural models, from the simplest empirical and phenomenological forms to more complex physics-based ones were developed during last century; some of them were embedded into commercial software. However, in spite of some successful implementations, the problem of the robust prediction of microstructure development in the real multi-operational industrial processes remains in general unsolved. Complex models often suffer due to high computational cost, possible mathematical instability and ill-defined calibration techniques. Simple models are easier for practical use but, due to the nature of the simplifying assumptions, have a limited range of validity, which is almost never specified. JMAK-type models are one of the examples of the relatively simple mathematical model forms popular for the description a number of metallurgical processes. One of them is recrystallisation, which is one of the dominating mechanisms in the hot working of metals. In this paper, the wellknown family of 718 nickel-base superalloys and a range of forging trials of different levels of complexity were used to analyze the applicability of the JMAK-type models.",
keywords = "microstructural modelling, JMAK-type model, Nickel superalloys,, validity analysis , nickel superalloys",
author = "Olga Bylja and Aleksey Reshetov and Nicola Stefani and Malgorzata Rosochowska and Paul Blackwell",
year = "2017",
month = "5",
day = "22",
language = "English",
journal = "Procedia Engineering",
issn = "1877-7058",

}

TY - JOUR

T1 - Applicability of JMAK-type model for predicting microstructural evolution in nickel-based superalloys

AU - Bylja, Olga

AU - Reshetov, Aleksey

AU - Stefani, Nicola

AU - Rosochowska, Malgorzata

AU - Blackwell, Paul

PY - 2017/5/22

Y1 - 2017/5/22

N2 - The question of the prediction of microstructural transformation over a wide range of temperatures and strain rates is important for the simulation of industrial hot forging processes, especially those focused on net-shape forging. A large spectrum of microstructural models, from the simplest empirical and phenomenological forms to more complex physics-based ones were developed during last century; some of them were embedded into commercial software. However, in spite of some successful implementations, the problem of the robust prediction of microstructure development in the real multi-operational industrial processes remains in general unsolved. Complex models often suffer due to high computational cost, possible mathematical instability and ill-defined calibration techniques. Simple models are easier for practical use but, due to the nature of the simplifying assumptions, have a limited range of validity, which is almost never specified. JMAK-type models are one of the examples of the relatively simple mathematical model forms popular for the description a number of metallurgical processes. One of them is recrystallisation, which is one of the dominating mechanisms in the hot working of metals. In this paper, the wellknown family of 718 nickel-base superalloys and a range of forging trials of different levels of complexity were used to analyze the applicability of the JMAK-type models.

AB - The question of the prediction of microstructural transformation over a wide range of temperatures and strain rates is important for the simulation of industrial hot forging processes, especially those focused on net-shape forging. A large spectrum of microstructural models, from the simplest empirical and phenomenological forms to more complex physics-based ones were developed during last century; some of them were embedded into commercial software. However, in spite of some successful implementations, the problem of the robust prediction of microstructure development in the real multi-operational industrial processes remains in general unsolved. Complex models often suffer due to high computational cost, possible mathematical instability and ill-defined calibration techniques. Simple models are easier for practical use but, due to the nature of the simplifying assumptions, have a limited range of validity, which is almost never specified. JMAK-type models are one of the examples of the relatively simple mathematical model forms popular for the description a number of metallurgical processes. One of them is recrystallisation, which is one of the dominating mechanisms in the hot working of metals. In this paper, the wellknown family of 718 nickel-base superalloys and a range of forging trials of different levels of complexity were used to analyze the applicability of the JMAK-type models.

KW - microstructural modelling, JMAK-type model, Nickel superalloys,

KW - validity analysis

KW - nickel superalloys

UR - http://www.sciencedirect.com/science/journal/18777058

M3 - Conference Contribution

JO - Procedia Engineering

T2 - Procedia Engineering

JF - Procedia Engineering

SN - 1877-7058

ER -