Inhomogenous deformation and strain-rate effects in high-strength TRIP steels

Azrin, Morris; Olson, Gregory B.; Gagne, Roger A.

doi:10.1016/0025-5416(76)90084-7

Cited by 23 publications

(14 citation statements)

References 5 publications

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“…The simultaneous measurement of plastic flow and transformation in TRIP steels 1~ verifies the existence of a temperature regime in which plastic flow is controlled by stress-assisted martensitic transformation. Under these conditions, the volume fraction of martensite (3') and the plastic strain (e) are found to be linearly related: 1~ f = ke [9] This, in turn, defines a linear relation between transformation rate and plastic strain rate. Here plastic flow will occur at the applied stress for which the combined (chemical and mechanical) driving force is sufficient to make the rate of transformation plasticity match the imposed strain rate; yielding in a constant strain-rate tensile test then corresponds to an imposed rate of stress-assisted isothermal transformation.…”

Section: Stress-assisted Transformationmentioning

confidence: 93%

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Stress-assisted isothermal martensitic transformation: Application to TRIP steels

1982

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Low-temperature plastic flow in TRIP steels has been found to be controlled by stress-assisted isothermal martensitic transformation. For these conditions, the thermodynamics and kinetic theory of martensitic transformations leads directly to constitutive relations predicting the dependence of flow stress on temperature, strain, strain-rate, and stress-state, consistent with the observed behavior of TRIP steels. Guidelines are obtained for the control of temperature sensitivity, tr-e curve shape, and stress-state effects to achieve novel mechanical properties.

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Section: Stress-assisted Transformationmentioning

confidence: 93%

“…[9]), substitution of f = ke gives a complete constitutive relation predicting the ~-e behavior when plastic flow is controlled by stressassisted isothermal martensitic transformation. As the last term in Eq.…”

Section: Isothermal Stress-strain Behaviormentioning

confidence: 99%

Stress-assisted isothermal martensitic transformation: Application to TRIP steels

1982

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“…However, some undesirable consequences, most notably inhompgeneous yielding and extreme temperature sensitivity have hampered the practical development and application of the high-strength TRIP steels (22,23). In the optimum temperature range only a small amount of adiabatic heating is required to drastically alter the shape of stress-strain curve with an attendant serious loss of uniform ductility.…”

Section: General Aspectsmentioning

confidence: 99%

Metastable Ferrous Austenite - Consequences on Fracture and Tribology

Schmidt¹

1989

ESOMAT 1989 - Ist European Symposium on Martensitic Transformations in Science and Technology

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“…The temperature problem was intensified at increased strain rates due to adiabatic heating . These limitations are more pronounced at the higher strength levels where there is nonuniform yielding in the form of a Liiders band (136). The imposed elongation is concentrated in the forming Luders band , greatly magnifying the adiabatic heating.…”

Section: G Trip Steelsmentioning

confidence: 99%

“…) of steels and alloys of aluminum , nickel , and titanium . Data for this report was obtained from scientific and technical literature dating from 1968 to April 1976. Of the Euras ian Communist Coun tr ies , only in the Soviet Union and to a lesser extent in Czechoslovakia is there a strong commitment to the research , developmen t , and utilization of TM'! '.…”

mentioning

confidence: 99%