The transition from multiple- to single-peak recrystallization during the hot working of austenite

Nazábal, J.; Urcola, J. J.; Fuentes, M.

doi:10.1016/0025-5416(87)90444-7

Cited by 15 publications

(8 citation statements)

References 12 publications

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“…Subsequently the flow stress drops with increasing strain to a steady state value ( σ ss ) at large strain. This flow behavior is typical of DRX and has been reported for a wide variety of metals and alloys 21–23. The softening (exhibited by the decrease of flow stress) beyond peak stress results from the large scale removal of dislocations by the growth of dislocation free regions.…”

Section: The Modeling Techniquesupporting

confidence: 59%

Kinetics of dynamic recrystallization in cobalt: A study using the Avrami relation

Sarkar

Chakravartty

Paul

et al. 2011

Physica Status Solidi (a)

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The progress of dynamic recrystallization (DRX) in polycrystalline wrought cobalt (Co) during hot deformation has been studied using a newly developed mechanical approach. The approach is based upon the analysis of the flow curve of the material to quantify the softening which is attributed to DRX. Avrami plots for Co during DRX have been generated using stress–strain curves under various deformation conditions. The values of the Avrami time exponents are ∼3.0. The dependence of the time of half‐softening on strain rate is found to exhibit similar behavior to that of other materials.

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Section: The Modeling Techniquesupporting

confidence: 59%

Kinetics of dynamic recrystallization in cobalt: A study using the Avrami relation

Sarkar

Chakravartty

Paul

et al. 2011

Physica Status Solidi (a)

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“…(9) is consistent with the classical literature data which has a value between -0.11 and -0.4 for steels. 4,5,[62][63][64][65] Moreover, The DS exponent of -0.8 in Eq. (10) is within the reported range of -0.7 to -0.8 for singlephase materials.…”

Section: Grain Refinementmentioning

confidence: 99%

Hot Deformation and Dynamic Recrystallization of 17-4 PH Stainless Steel

Mirzadeh

Najafizadeh

2013

ISIJ Int.

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The hot deformation behavior of a 17-4 PH stainless steel was investigated by compression tests. The typical single-peak dynamic recrystalization (DRX) behavior and also a transition state between single and multiple peak (cyclic) behaviors were seen in the resultant flow curves. The application of constitutive equations for determination of hot working constants was critically discussed. As a result, the deformation activation energy and the stress multiplier in the hyperbolic sine equation were determined as 337 kJ/mol and 0.011, respectively. The Zener-Hollomon parameter (Z) exponents for peak stress and peak strain based on the power relationships were determined as 0.18 and 0.11, respectively. The normalized critical stress and strain for initiation of DRX were respectively found to be 0.89 and 0.47. The prior austenite grain boundaries (PAGB) were revealed by electrolytic etching of the martensite in order to study the microstructure of hot deformed samples. Significant grain refinement occurred as a result of necklace DRX mechanism. The average dynamically recrystallized grain size was related to Z and peak stress by power equations with exponents of -0.25 and -1.24, respectively. A DRX map was developed to show the effect of deformation conditions on the occurrence of DRX and on the final grain size.

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“…However, a transition from single peak to multiple peak behaviour has been reported under certain deformation conditions (very low strain rate and high temperature) and/or initial microstructures (small grain sizes). [1][2][3] Despite several studies of DRX in austenite exhibiting multiple peaks, 2,[4][5][6][7][8][9][10][11] many details remain unclear. The critical conditions for transition from single to multiple peaks, the microstructural development and also grain size evaluation under multiple peaks behaviour, are examples of issues that have not been completely resolved.…”

Section: Introductionmentioning

confidence: 99%

Dynamic Recrystallization of Austenitic Stainless Steel under Multiple Peak Flow Behaviours

Dehghan-Manshadi

Hodgson

2007

ISIJ Int.

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The transition from multiple- to single-peak recrystallization during the hot working of austenite

Cited by 15 publications

References 12 publications

Kinetics of dynamic recrystallization in cobalt: A study using the Avrami relation

Kinetics of dynamic recrystallization in cobalt: A study using the Avrami relation

Hot Deformation and Dynamic Recrystallization of 17-4 PH Stainless Steel

Dynamic Recrystallization of Austenitic Stainless Steel under Multiple Peak Flow Behaviours

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