Modeling and Investigation of Dynamic Recrystallisation in Nickel-Based Superalloys

Sommitsch, Christof; Walter, Michael J.; Wedl, Franz; Kleber, Siegfried

doi:10.4028/www.scientific.net/msf.426-432.743

Cited by 4 publications

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“…The specimens remained at 1200°C or were cooled down to the test temperatures of 1120, 1050 and 950°C by 1Ks -1 and were compressed at a constant strain rate to strains ε = 2 x ε peak to ensure MDRX behaviour. The peak-strains ε peak were estimated from flow curves which were recorded in a previous investigation by the identical test conditions [8]. The applied strain values can be taken from Table 1, which gives an overview of this test program.…”

Section: Methodsmentioning

confidence: 99%

Stress Relaxation Measurements of Meta-Dynamic and Static Recrystallization of Alloy 80A

Kleber

Sommitsch

2004

MSF

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The stress relaxation method has been applied to the nickel-based alloy 80A to predict meta-dynamic (MDRX) and static recrystallization (SRX) kinetics. Compression tests were performed on a Gleeble 3800 system atr different temperatures (950-1200°C). The strain rate was varied in the case of MDRX and the pre-strain in the case of SRX. To investigate MDRX, the prestrain was set to twice the peak strain in order to reach steady state before holding. To focus on the interaction of MDRX and SRX, the pre-strain was set to the peak strain, where dynamic recrystallization (DRX) starts but does not yet reach steady state. Avrami type equations for the prediction of both the MDRX and SRX were adapted to feed a semi-empirical grain structure model.

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Section: Methodsmentioning

confidence: 99%

Stress Relaxation Measurements of Meta-Dynamic and Static Recrystallization of Alloy 80A

Kleber

Sommitsch

2004

MSF

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Coupled Physical and Numerical Simulation to Optimize Thermo-mechanical Metal Forming Processes

Sommitsch

Buchmayr

2007

steel research international

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The numeric simulation of thermo-mechanical hot forming processes and the modelling of the structure development and the mechanical properties of complex metallic materials serve for both the optimization of forming processes and the increase of process reliability. To meet close process windows, predictions of the formability of the material as function of the process conditions and material history are required as well. Lifetime evaluation of the tools is made possible from coupled computation of workpiece and tool loads. Material and damage models in use must be adapted on the basis of laboratory experiments and advanced analysis methods.

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On modelling of dynamic recrystallisation of fcc materials with low stacking fault energy

Sommitsch

Mitter

2006

Acta Materialia

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Modeling and Investigation of Dynamic Recrystallisation in Nickel-Based Superalloys

Cited by 4 publications

References 0 publications

Stress Relaxation Measurements of Meta-Dynamic and Static Recrystallization of Alloy 80A

Stress Relaxation Measurements of Meta-Dynamic and Static Recrystallization of Alloy 80A

Coupled Physical and Numerical Simulation to Optimize Thermo-mechanical Metal Forming Processes

On modelling of dynamic recrystallisation of fcc materials with low stacking fault energy

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