On dislocation accumulation and work hardening in Hadfield steel

Hutchinson, Bevis; Ridley, N.

doi:10.1016/j.scriptamat.2006.05.002

Cited by 190 publications

(66 citation statements)

References 12 publications

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“…Dynamic stain aging was reported to be significant but had less effect on work hardening compared to deformation twinning. 16,31,33) Considering that deformation twinning dominates the work hardening, and that an increase in the work hardening rate is often observed when dynamic strain aging occurs, we speculate that there is an important interaction between dynamic strain aging and deformation twinning. In recent papers, dynamic strain aging has been reported to arise from an interaction between carbon and the point defects in stacking faults 14) and an interaction between carbon and trailing partials.…”

Section: Comparison With Other High Mn Steelsmentioning

confidence: 88%

TWIP Effect and Plastic Instability Condition in an Fe^|^ndash;Mn^|^ndash;C Austenitic Steel

2013

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We investigated the correlation among deformation twin density, work hardening, and tensile ductility in an Fe-18Mn-1.2C twinning-induced-plasticity (TWIP) steel, and discussed the correlation with the plastic instability condition. The deformation twin density was varied by changing the deformation temperature from 123 to 523 K. An important factor for the uniform elongation is the work hardening rate in a later deformation stage. The increase in the deformation twin density enhanced the work hardening rate significantly but not monotonically just before the fracture, since the deformation twin density is saturated against plastic strain. In addition, dynamic strain aging in a later deformation stage and ε-martensitic transformation were found to accelerate the fracture due to the localized deformation and the premature fracture, respectively. Accordingly, the relationship between uniform elongation and deformation twin density was not simple. The optimum conditions for the TWIP effect were concluded to be (1) considerable amount of deformation twinning in a later deformation stage, (2) suppression of dynamic strain aging in a later deformation stage, and (3) inhibition of ε-martensitic transformation.KEY WORDS: high carbon; high Mn steel; austenitic steel; twinning-induced plasticity; work hardening; dynamic strain aging.

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Section: Comparison With Other High Mn Steelsmentioning

confidence: 88%

TWIP Effect and Plastic Instability Condition in an Fe^|^ndash;Mn^|^ndash;C Austenitic Steel

2013

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“…Generally, an increase in the yield strength of TWIP steels by cold working is associated with grain boundary strengthening, strain hardening and dynamic strain aging (DSA) [2][3][4][5][6]8,9,[15][16][17]. In high-Mn TWIP-steels, DSA is a type of solid solution strengthening attributed to the formation of interstitial C -substitutional Mn dipoles interacting strongly with dislocations or stacking faults.…”

Section: Introductionmentioning

confidence: 99%

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Kusakin

Belyakov

Haase

et al. 2014

Materials Science and Engineering: A

123

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a b s t r a c tThe effect of cold rolling on the microstructure evolution and mechanical properties of Fe-23Mn-0.3C-1.5Al twinning-induced plasticity (TWIP) steel was studied. The extensive mechanical twinning subdivides the initial grains into nanoscale twin lamellas. In addition, the formation of deformation micro bands at ε440% induces the formation of nanostructured bands of localized shear. It is demonstrated that the mechanical twinning is notably important for dislocation storage within the matrix, as the twin boundaries act as equally effective obstacles to dislocation glide as conventional high-angle grain boundaries. However, the contribution of the grain size strengthening to the overall yield stress (YS) is much smaller than that of the deformation strengthening, which plays a major role in the superior work-hardening behavior of TWIP steels. A very high dislocation density of $ 2 Â 10 15 m À 2 is achieved after plastic deformation with moderate strains. The superposition of deformation strengthening and grain boundary strengthening leads to an increase in the YS from 235 MPa in the initial state to 1400 MPa after 80% rolling.

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“…Figure 5 shows the relationship between the ln ¾ c and 1/T. Our previous study 23) along with many other reports 59,12,24,25) has indicated that the serrations in FeMnC austenitic steels stem from dynamic strain aging. The initiation of the dynamic strain aging in the temperature range of 273 to 523 K is associated with the diffusion of carbon atoms, since dynamic strain aging with substitutional atoms and dynamic precipitation requires a higher deformation temperature.…”

Section: Resultsmentioning

confidence: 77%

Influence of Dislocation Separation on Dynamic Strain Aging in a Fe–Mn–C Austenitic Steel

2012

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The influences of deformation temperature and strain rate on the serrated flow behavior of a Fe17Mn0.3C alloy with a low stacking fault energy were investigated by the tensile tests in a temperature range of 273 to 523 K. Three regions were found when the deformation temperature was plotted against the critical strains for the onset of serrations. The critical strain decreased in the region of 273 to 323 K, increased in that of 323 to 423 K, and decreased again in that of 423 to 523 K with increasing temperature. The first two regions are well known. However, the third region corresponding to that of high temperature has not been reported, and this region could be interpreted by separately considering the interactions of solute atoms with leading and trailing partials. Since the velocity of the leading partials is assumed to be significantly higher than that of the trailing partials, the critical strains in the first and third regions were concluded to result from trapping the trailing partials and the leading partials, respectively.

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On dislocation accumulation and work hardening in Hadfield steel

Cited by 190 publications

References 12 publications

TWIP Effect and Plastic Instability Condition in an Fe^|^ndash;Mn^|^ndash;C Austenitic Steel

TWIP Effect and Plastic Instability Condition in an Fe^|^ndash;Mn^|^ndash;C Austenitic Steel

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Influence of Dislocation Separation on Dynamic Strain Aging in a Fe–Mn–C Austenitic Steel

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On dislocation accumulation and work hardening in Hadfield steel

Cited by 190 publications

References 12 publications

TWIP Effect and Plastic Instability Condition in an Fe^|^ndash;Mn^|^ndash;C Austenitic Steel

TWIP Effect and Plastic Instability Condition in an Fe^|^ndash;Mn^|^ndash;C Austenitic Steel

Microstructure evolution and strengthening mechanisms of Fe–23Mn–0.3C–1.5Al TWIP steel during cold rolling

Influence of Dislocation Separation on Dynamic Strain Aging in a Fe&ndash;Mn&ndash;C Austenitic Steel

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Influence of Dislocation Separation on Dynamic Strain Aging in a Fe–Mn–C Austenitic Steel