A dislocation model for dynamical strain ageing of α-iron in the jerky-flow region

Bergström, Y.; Roberts, W. T.

doi:10.1016/0001-6160(71)90058-7

Cited by 33 publications

(25 citation statements)

References 8 publications

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“…DSA-induced hardening, manifested by the anomalies associated with DSA in Section 3.1, is thought to come from the following two mechanisms: (1) based on the impurity pinning model [21], DSA is a consequence of the pinning and regeneration of dislocations. The pinning of dislocations during deformation could result from the formation of either Snoek or Cottrell atmospheres.…”

Section: Microstructuresmentioning

confidence: 99%

Mechanism of dynamic strain aging and characterization of its effect on the low-cycle fatigue behavior in type 316L stainless steel

Hong

Lee

2005

Journal of Nuclear Materials

149

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Section: Microstructuresmentioning

confidence: 99%

Mechanism of dynamic strain aging and characterization of its effect on the low-cycle fatigue behavior in type 316L stainless steel

Hong

Lee

2005

Journal of Nuclear Materials

149

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“…Because of their high diffusivity, these solute atoms are mainly carbon and nitrogen in low carbon steels. When these atoms form atmospheres around mobile dislocation and lock them, strain aging occurs and results in increased strength and decreased ductility (Ref [17][18][19][20]. When the straining and aging processes take place simultaneously, it is called DSA, which affects work-hardening behavior of the material.…”

Section: Introductionmentioning

confidence: 99%

The Effect of Dynamic Strain Aging on Subsequent Mechanical Properties of Dual-Phase Steels

Molaei

Ekrami

2009

J. of Materi Eng and Perform

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Dual-phase (DP) steels with different martensite contents were produced by subjecting a low carbon steel to various heat treatment cycles. In order to investigate the effect of dynamic strain aging (DSA) on mechanical properties, tensile specimens were deformed 3% at 300°C. Room temperature tensile tests of specimens which deformed at 300°C showed that both yield and ultimate tensile strengths increased, while total elongation decreased. The fatigue limit increased after pre-strain in the DSA temperature range. The effects of martensite volume fraction on mechanical properties were discussed.

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“…Generally, dislocation density tends to decline as temperature increases. However, the reverse was noted in the experiments published by [12], as well as the model predictions by [13] (see Figure 2). Following [13], the dislocation density can be given as a function of the equivalent plastic strain.…”

Section: Introductionmentioning

confidence: 75%

Constitutive Models for Dynamic Strain Aging in Metals: Strain Rate and Temperature Dependences on the Flow Stress

2020

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A new constitutive model for Q235B structural steel is proposed, incorporating the effect of dynamic strain aging. Dynamic strain aging hugely affects the microstructural behavior of metallic compounds, in turn leading to significant alterations in their macroscopic mechanical response. Therefore, a constitutive model must incorporate the effect of dynamic strain aging to accurately predict thermo-mechanical deformation processes. The proposed model assumes the overall response of the material as a combination of three contributions: athermal, thermally activated, and dynamic strain aging stress components. The dynamic strain aging is approached by two alternative mathematical expressions: (i) model I: rate-independent model; (ii) model II: rate-dependent model. The proposed model is finally used to study the mechanical response of Q235B steel for a wide range of loading conditions, from quasi-static loading ( ε ˙ = 0.001 s − 1 and ε ˙ = 0.02 s − 1 ) to dynamic loading ( ε ˙ = 800 s − 1 and ε ˙ = 7000 s − 1 ), and across a broad range of temperatures ( 93 K − 1173 K ). The results from this work highlight the importance of considering strain-rate dependences (model II) to provide reliable predictions under dynamic loading scenarios. In this regard, rate-independent approaches (model I) are rather limited to quasi-static loading.

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A dislocation model for dynamical strain ageing of α-iron in the jerky-flow region

Cited by 33 publications

References 8 publications

Mechanism of dynamic strain aging and characterization of its effect on the low-cycle fatigue behavior in type 316L stainless steel

Mechanism of dynamic strain aging and characterization of its effect on the low-cycle fatigue behavior in type 316L stainless steel

The Effect of Dynamic Strain Aging on Subsequent Mechanical Properties of Dual-Phase Steels

Constitutive Models for Dynamic Strain Aging in Metals: Strain Rate and Temperature Dependences on the Flow Stress

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