Serrated yielding in AISI 316 stainless steel

Samuel, K.G.; Mannan, S.L.; Rodríguez, P.

doi:10.1016/0001-6160(88)90331-8

Cited by 123 publications

(43 citation statements)

References 15 publications

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“…As well, the activation energy for appearance of serrated yielding was calculated as 86 (kJ/mol) and the activation energy for termination of serration was determined as 158 (kJ/mol), which are in agreement with those calculated in other works. 3,21) Figure 4 shows the conditions that serrated flow occurs, respectively. In addition, the strain rate sensitivity was calculated using the flow stress at the true strain of 0.15.…”

Section: Resultsmentioning

confidence: 99%

Prediction of Flow Behavior during Warm Working

Serajzadeh

2004

ISIJ International

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In this work, the effects of dynamic strain aging and dynamic recovery on metal flow during warm working are studied. Compression experiments are utilized to assess the flow behavior of a low carbon steel under warm deformation conditions. Then, a two dimensional finite element routine is coupled with dynamic recovery and dynamic strain aging models. In this way, the temperature and the velocity fields are predicted during warm working operations with regard to the effects of dynamic recovery and dynamic strain aging. Warm rolling tests are performed in order to verify the modelling results. Comparison between the predicted and measured roll forces shows reliability of the employed model. KEY WORDS: warm rolling; dynamic strain aging; dynamic recovery; finite element analysis.

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Section: Resultsmentioning

confidence: 99%

Prediction of Flow Behavior during Warm Working

Serajzadeh

2004

ISIJ International

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“…Later this decrease in the band velocity with increasing stress rate was observed for various alloys by numerous researchers [118,124]. The dependence on temperature and strain rate has been studied rigorously, and all observations have shown that the serrated flow of a particular metal occurs at particular strain rates in combination with suitable temperatures [7,8,[135][136][137][138], a feature that many authors have directly connected to the matching of the mobility of solutes with that of dislocations [7,138,139]. Because of the long-observed reproducible and well-established temperature-strain rate relationship, Lebyodkin et al proposed the construction of a phase diagram based on strain rate versus reciprocal temperature [49,140].…”

Section: Fundamental Achievementsmentioning

confidence: 99%

The Portevin–Le Chatelier effect: a review of experimental findings

Yılmaz¹

2011

Science and Technology of Advanced Materials

241

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The Portevin-Le Chatelier (PLC) effect manifests itself as an unstable plastic flow during tensile tests of some dilute alloys under certain regimes of strain rate and temperature. The plastic strain becomes localized in the form of bands which move along a specimen gauge in various ways as the PLC effect occurs. Because the localization of strain causes degradation of the inherent structural properties and surface quality of materials, understanding the effect is crucial for the effective use of alloys. The characteristic behaviors of localized strain bands and techniques commonly used to study the PLC effect are summarized in this review. A brief overview of experimental findings, the effect of material properties and test parameters on the PLC effect, and some discussion on the mechanisms of the effect are included. Tests for predicting the early failure of structural materials due to embrittlement induced by the PLC effect are also discussed.

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“…It has been documented that serrated yielding in monotonic testing only occurs within a well-delimited region of temperatures, strains, and strain rates. [18] This can also be applied to cyclic loading. [2] Following the preceding ideas and based on the observations here appreciated, it may be deduced that longer arresting times, i.e., more effective blocking effect, are obtained for the high strain amplitude fatigue tests, because the higher dislocation density involved in order to attain the imposed strain amplitude increases the probability for solute interaction.…”

Section: B Serrationsmentioning

confidence: 99%

“…In single-phase austenitic stainless steels, DSA has been reported to occur on a wide interval of temperatures, i.e., from 200°C to 800°C. [2][3][4][5][6][7][8][9]18,19] However, in the case of DSS in the intermediate temperature range, ferrite is the phase more affected by DSA because of the easier diffusion of chromium in a-iron. [22] Therefore, the reason for the change in the dislocation arrangements on austenite is not straightly related to DSA, but actually it is rather a consequence of it.…”

Section: Substructural Features Associated With Cyclic Deformationmentioning

confidence: 99%

“…[15,16,17] Regarding physical mechanisms, monotonic and cyclic mechanical responses exhibited for single-phase stainless steels at intermediate temperatures are usually related with the operation of dynamic strain aging (DSA) phenomena. Most of the information has been provided for austenitic grades, [2,[4][5][6]18,19] although there also exists some literature regarding ferritic and martensitic stainless steels. [20,21] Recently, DSA effects have been reported on DSSs, [15][16][17]22] even though for these steels experimental data are quite limited.…”

Section: Introductionmentioning

confidence: 99%

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Cyclic deformation of superduplex stainless steels at intermediate temperatures

Gironès¹,

Llanes

Anglada

et al. 2006

Metall Mater Trans A

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Cyclic deformation of a superduplex stainless steel at temperatures ranging from room temperature to 475°C was evaluated for two different strain amplitudes. Cyclic hardening-softening response and the corresponding substructural features within each constituent phase of the alloy were characterized. Experimental evidence, such as abnormal cyclic hardening, inverse strain rate sensitivity (SRS), and serrated flow, reveals the existence of dynamic strain aging (DSA) in the studied temperature range. Substructural evolution suggests that DSA induces changes in the distribution of plastic strain between austenite and ferrite. In the case of tests performed at 475°C, there exists a significant influence of thermal embrittlement too.

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Serrated yielding in AISI 316 stainless steel

Cited by 123 publications

References 15 publications

Prediction of Flow Behavior during Warm Working

Prediction of Flow Behavior during Warm Working

The Portevin–Le Chatelier effect: a review of experimental findings

Cyclic deformation of superduplex stainless steels at intermediate temperatures

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