The Effect of Strain Rate, Temperature and Grain Size on the Lower Yield Stress and Flow Stress of Polycrystalline Pure Iron

Sakui, Seita; Sakai, Taku

doi:10.2355/tetsutohagane1955.58.10_1438

Cited by 14 publications

(7 citation statements)

References 13 publications

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“…This HAGB strengthening is simulated using the well-known Hall-Petch equation. Based on the measured data of Sakui et al [30,31] for pure Fe, an exponential dependence of the Hall-Petch constant, kHP, on temperature is observed (see Figure 2). Thus, the HAGB contribution to strength is:…”

Section: Contribution Of Grain Boundaries To Yield Strengthmentioning

confidence: 80%

“…For the Fe-23Ni alloy, db is 2.46 μm and kHP is 0.21 MPa.m 1/2 [22]. The constant kHP for the Fe-1.5Mn and Fe-C alloys is set at 0.18 MPa.m 1/2 , the value for pure Fe at room temperature [30]. The solute strengthening constants, α and φ, are identified using a best fit with Fe-23Ni experimental data, with the model parameters for Fe alloys presented in Table 2.…”

Section: Predicting the Contribution Of High And Low-angle Boundaries...mentioning

confidence: 99%

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A physically-based high temperature yield strength model for 9Cr steels

Barrett

O’Donoghue

Leen

2018

Materials Science and Engineering: A

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Section: Contribution Of Grain Boundaries To Yield Strengthmentioning

confidence: 80%

Section: Predicting the Contribution Of High And Low-angle Boundaries...mentioning

confidence: 99%

A physically-based high temperature yield strength model for 9Cr steels

Barrett

O’Donoghue

Leen

2018

Materials Science and Engineering: A

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“…From a series of tensile tests for αFe at low strain rates (7) , a relation between the thermal activation volume, v * , and the thermal component of true stress, σ * , was determined experimentally by using a constant, B, as follows:…”

Section: Consideration From Yieldingmentioning

confidence: 99%

“…A relation between the thermal component of stress and the strain rate evaluated from experiments for αFe (7) and the temperature-strain rate parameter (4), (5) were used. The prediction was successfully performed and they show that stress-strain behaviour at high strain rates can be predicted from quasi-static data with good accuracy.…”

Section: Introductionmentioning

confidence: 99%

Prediction of Mechanical Behaviour of Low Carbon Steel at High Strain Rate Using Thermal Activation Theory and Static Data

Ogawa

Kobayashi

Sugiyama

et al. 2005

JSME Int. J., Ser. A

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Thermal activation theory is well-known to be a useful theory to explain the mechanical behaviour of various metals in the wide range of temperature and strain-rate. In this study, a number of trials to obtain the lower yield stress or flow stress at high strain rates from quasi-static data were carried out using the data shown in the report titled "The final report of research group on high-speed deformation of steels for automotive use". A relation between the thermal component of stress and the strain rate obtained from experiments for αFe and the temperature-strain rate parameter were used with thermal activation theory. The predictions were successfully performed and they showed that the stress-strain behaviour at high strain rates can be evaluated from quasi-static data with good accuracy.

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“…[4][5][6] It is well known that BCC steels have a brittle-ductile transition temperature and that fracture behavior from brittle to ductile changes with increasing temperature. [7][8][9] In pure Fe 10,11) and Fe-Si alloys, 12,13) a low temperature deformation occurs by a combination of deformation twinning and dislocation motion. It is generally accepted that a pile-up dislocation against a barrier provides a suitable stress concentration to initiate twinning.…”

Section: Introductionmentioning

confidence: 99%