Estimation of homogenisation time for superalloys based on a new diffusional model

Sohrabi, Mohammad Javad; Mirzadeh, Hamed

doi:10.1080/02670836.2019.1706906

Cited by 10 publications

(2 citation statements)

References 32 publications

(50 reference statements)

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“…Sreenu [ 16 ] investigated the microscopic structure features in a new P/M superalloy which was processed by the HIP route. In addition, the mathematical model is a vital way to depict the relationship between deformation conditions and rheological features, as well as the microscopic structure evolution in alloys [ 7 , 17 , 18 , 19 , 20 ]. Meanwhile, accurate mathematical models are essential to analyze/forecast material deformation behavior and the evolution of the microstructure by the finite element method (FEM) [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

et al. 2022

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The dynamic recrystallization (DRX) features and the evolution of the microstructure of a new hot isostatic pressed (HIPed) powder metallurgy (P/M) superalloy are investigated by hot-compression tests. The sensitivity of grain dimension and DRX behavior to deformation parameters is analyzed. The results reveal that the DRX features and grain-growth behavior are significantly affected by deformation conditions. The DRX process is promoted with a raised temperature/true strain or a reduced strain rate. However, the grains grow up rapidly at relatively high temperatures. At strain rates of o.1 s−1 and 1 s−1, a uniform microstructure and small grains are obtained. Due to the obvious differences in the DRX rate at various temperatures, the piecewise DRX kinetics equations are proposed to predict the DRX behavior. At the same time, a mathematical model for predicting the grain dimension and the grain growth behavior is established. To further analyze the DRX behavior and the changes in grain dimension, the hot deformation process is simulated. The developed grain-growth equation as well as the piecewise DRX kinetics equations are integrated into DEFORM software. The simulated DRX features are consistent with the test results, indicating that the proposed DRX kinetics equations and the established grain-growth model can be well used for describing the microstructure evolution. So, they are very useful for the practical hot forming of P/M superalloy parts.

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Section: Introductionmentioning

confidence: 99%

Modeling Dynamic Recrystallization Behavior in a Novel HIPed P/M Superalloy during High-Temperature Deformation

et al. 2022

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“…The homogenisation treatment has been applied to many commercial alloys for the enhancement of their properties [15][16][17][18][19][20][21]. For a low-alloyed TRIP steel, a profound effect of homogenisation treatment on the decomposition of austenite, suppression of microstructural banding, and work-hardening capacity were observed [13].…”

Section: Introductionmentioning

confidence: 99%

Effects of hot rolling and homogenisation treatment on low alloy steel ingot

Baharvand

Zanganeh

Mirzadeh

et al. 2020

Materials Science and Technology

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The effects of hot rolling and homogenisation treatment on the microstructure and mechanical properties of low-alloy transformation-induced plasticity (TRIP) steel were studied. With increasing the reduction in thickness during rolling, the band spacing and the average ferrite grain size decreased with the consequent enhancement of mechanical properties. Homogenisation treatment resulted in the gradual fading of the banded morphology, more homogeneous microhardness profile, and twice total elongation compared to the as-cast counterpart. The experimentally observed homogenisation time judged by the disappearance of the banded structure was in agreement with the obtained values based on the band spacing and elemental analysis. This work provided scientific evidence for the assumptions used to derive the homogenisation formulae.

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