Effects of Strain, Strain Rate, and Temperature on the Hot Worked Structure of a 0.16% Carbon Steel

Sakui, Seita; Sakai, Taku; Takeishi, Kazuo

doi:10.2355/tetsutohagane1955.62.7_856

Cited by 23 publications

(12 citation statements)

References 6 publications

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“…9, the equation of e 99% as a function of Z obtained by fitting all the data is shown. The equation is believed to be equivalent to the relationship between the recrystallized grain size and the Hollomon parameter (Sakui 1977 Here the exponent g is 0.24, which is comparable to the exponent b (0.284) in Eq. (3).…”

Section: Strain Required For Drxmentioning

confidence: 65%

Ultrafine Grain Structure through Dynamic Recrystallization for Type 304 Stainless Steel.

2002

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Ultrafine grain structure in the Type 304 austenitic stainless steel are pursed through dynamic recrystallization. The recrystallization behaviors are studied at various combinations of deformation temperatures and strain rates accompanying the higher strain under a plain strain compression. The effects of the strain, the strain rate and the deformation temperature are investigated, and the relationship between the deformation conditions and the dynamic recrystallized grain size is analyzed. The critical strain needed for the initiation of recrystallization increases with the Z-H parameter. Empirical equations concerning the critical strain and the dynamic recrystallized grain size are discussed, and processing parameter maps are proposed for the complete dynamic recrystallization.

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Section: Strain Required For Drxmentioning

confidence: 65%

Ultrafine Grain Structure through Dynamic Recrystallization for Type 304 Stainless Steel.

2002

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“…26,[32][33][34] If stress oscillations appear before reaching the steady state, then several recrystallization and grain growth cycles occur before the steady state strain, which tend to die out gradually, and the stress behavior is said to be of the cyclic or multiple peak type. [38][39][40][41] In this case, the growth of grains is stopped by boundary impingement and not by concurrent deformation. 24,42) There is no evidence of classical multiple peaks in the flow curves of this work, even at very low strain rate of 0.001 s -1 and high temperature of 1 150°C.…”

Section: Hot Working Behaviormentioning

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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“…12) However, it has been proposed that this criterion is mostly applicable for torsion tests and is unlikely for compression and tensile tests. 1) In the second criterion, proposed by Sakai and his coworkers, 1,13,14) each type of flow curve represents a specific mechanism of recrystallization. According to this model, the single peak flow curve reflects a growth controlled mechanism (i.e.…”

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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Effects of Strain, Strain Rate, and Temperature on the Hot Worked Structure of a 0.16% Carbon Steel

Cited by 23 publications

References 6 publications

Ultrafine Grain Structure through Dynamic Recrystallization for Type 304 Stainless Steel.

Ultrafine Grain Structure through Dynamic Recrystallization for Type 304 Stainless Steel.

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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