Recovery and Recrystallization during High Temperature Deformation

McQueen, H.J.; Jonas, John J.

doi:10.1016/b978-0-12-341806-7.50014-3

Cited by 315 publications

(143 citation statements)

References 37 publications

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“…Kumar u~ has used the principle of separability in arriving at the dissipation function that relates to the metallurgical processes (J co-content) using the strain-rate sensitivity, and the variation of this dissipation function (J content) with strain rate is considered for defining the condition for the occurrence of metallurgical instability at constant temperature: 6J/6g: < J/~ [7] Using Eq. [3] in Eq. [7], we get the criterion for instability given Eq.…”

Section: Microstructural Instabilitiesmentioning

confidence: 99%

Processing map for hot working of alpha-zirconium

1991

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The hot deformation characteristics of alpha-zirconium in the temperature range of 650 ~ to 850 ~ and in the strain-rate range of 10 -3 to 102 S -1 are studied with the help of a power dissipation map developed on the basis of the Dynamic Materials Model. [7'8'91 The processing map describes the variation of the efficiency of power dissipation (77 --2m/m + 1) calculated on the basis of the strain-rate sensitivity parameter (m), which partitions power dissipation between thermal and microstructural means. The processing map reveals a domain of dynamic recrystallization in the range of 730 ~ to 850 ~ and l0 -2 to 1 s -1, with its peak efficiency of 40 pct at 800 ~ and 0.1 s -1, which may be considered as optimum hot-working parameters. The characteristics of dynamic recrystallization are similar to those of static recrystallization regarding the sigmoidal variation of grain size (or hardness) with temperature, although the dynamic recrystallization temperature is much higher. When deformed at 650 ~ and 10 -3 s -t, texture-induced dynamic recovery occurred, while at strain rates higher than 1 s -l, alpha-zirconium exhibits microstructural instabilities in the form of localized shear bands which are to be avoided in processing.

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Section: Microstructural Instabilitiesmentioning

confidence: 99%

Processing map for hot working of alpha-zirconium

1991

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“…The value of peak stress is a marked characteristic of the occurrence of dynamic recrystallization. 20,21) Here, the value of this stress is of the order of 180 MPa at a strain of approximately 0.5 for the sample tested at a strain rate of 0.1 s Ϫ1 . The peak stress in this case is well established since the steady state stress is approximately 160 MPa.…”

Section: Notementioning

confidence: 99%

Hot Deformation of 304 Type Austenitic Stainless Steel at High Strain Rates.

Almeida¹,

Barbosa

2003

ISIJ International

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“…In 1992, the International Organization for Standardization specified the ISO 5832-9 fixing composition limits of 22Cr -10.6 Ni -2.4 Mo -Nb 0.42-0.37 N, describes the features and defines test methods to austenitic stainless steels with high nitrogen used in orthopedic implants. These steels combines high strength with localized corrosion, even in the annealed condition and are of relatively low cost 2,3 . The hot deformation processing of metallic materials, held at high temperatures aims to control shape changing, but also achieving optimal mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Prediction of hot flow plastic curves of ISO 5832-9 steel used as orthopedic implants

et al. 2014

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An austenitic stainless steel ISO 5832-9 used as a biomaterial was torsion-deformed over the temperature range of 1000-1200 °C and strain rates of 0.05, 0.1, 1.0 and 5.0 s -1 . The flow stress curves obtained showed two regions where firstly there is a rising on stress characterized as work hardening mechanism acting and secondly a decreasing in work-softening after a peak stress. The flow curves were modeled by adjusting the experimental data with Zener-Hollomom parameter to construct the constitutive equations that describe the plastic behavior in both regions. The first region was described until the peak stress, taking into consideration the competition between work hardening and recovery while the second one was described applying the softening time of 50% and the Avrami equation. In some hot deformation conditions the simulated curves showed good agreement with the experimental ones while in others conditions the simulated showed differences to experimental curves that was discussed and associated with other mechanisms that acted during hot deformation.

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Recovery and Recrystallization during High Temperature Deformation

Cited by 315 publications

References 37 publications

Processing map for hot working of alpha-zirconium

Processing map for hot working of alpha-zirconium

Hot Deformation of 304 Type Austenitic Stainless Steel at High Strain Rates.

Prediction of hot flow plastic curves of ISO 5832-9 steel used as orthopedic implants

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