Transformation behavior of TRIP steels

Olson, Gregory B.; Azrin, Morris

doi:10.1007/bf02659928

Cited by 179 publications

(103 citation statements)

References 8 publications

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“…9 However, the temperature dependence of the stress-assisted transformation kinetics is zero at T~, and so the temperature sensitivity of the contribution of stress-assisted nucleation to the overall transformation kinetics at ambient temperatures can be decreased by moving T~ closer to 300 K. From Eq. [10] and Figure 2, T~ is located where -A S matches the slope of AGcrit , corresponding to a value for this alloy of 0.43 cal/mole-~ (1.80 J/mole-~ as shown in Figure 4. Thermodynamic calculations indicate that substitution of manganese for nickel in these steels could bring the magnitude of the room-temperature transformation entropy 9 g change close to this value.…”

Section: T E M P E R a T U R E D E P E N D E N C E Of P L A S T Imentioning

confidence: 68%

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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: T E M P E R a T U R E D E P E N D E N C E Of P L A S T Imentioning

confidence: 68%

“…In addition, comparison of the isothermal transformation kinetic data for Fe-Ni and Fe-Ni-Mn alloys 12-~6 suggests that manganese may reduce the B parameter; as indicated by Eqs. [10] and [11], this would also serve to raise T o .…”

Section: T E M P E R a T U R E D E P E N D E N C E Of P L A S T Imentioning

confidence: 99%

Stress-assisted isothermal martensitic transformation: Application to TRIP steels

1982

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“…In the temperature regime between S M and σ S M in which plastic flow is controlled by stressassisted transformation, the volume fraction of transformed martensite ( f α ′ ) is proportional to the plastic strain (ε) [11]:…”

Section: Brief Description Ofdeformation-induced Martensite Transformmentioning

confidence: 99%

“…During the austenite to martensite transformation, the macroscopic plastic strain, arises from the shape change as determined by the preferential selection of favourable crystallographic variants (Magee effect [9]) and from the plastic accommodation processes which occur around the forming martensite grains (the Greenwood-Johnson effect) [6,12,16,19]. During deformation-induced transformation, two main factors control the plastic flow behaviour of the material: (i) the dynamic softening arising from plastic straining due to the dilation effect upon formation of martensitic grains [11,17] and, (ii) the static hardening caused by the increasing volume fraction of the harder martensitic phase. Dynamic softening is dominant at low strains, whereas the static hardening effect is related to the fraction of martensite formed at the stress and strain-assisted regimes via Eqs.…”

Section: Transformation-induced Plasticity Effectmentioning

confidence: 99%

Retained Austenite: Transformation-Induced Plasticity

Pereloma¹,

Gazder²,

Timokhina³

2016

Encyclopedia of Iron, Steel, and Their Alloys

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The deformation-induced phase transformation of metastable austenite to martensite is accompanied by macroscopic plastic strain and results in significant work hardening and the delayed onset of necking. Steels that exhibit such transformation-induced plasticity (TRIP) effect possess high strength-ductility ratios and improved toughness. Since the stability of the retained austenite (RA) phase is the rate controlling mechanism for the TRIP effect, the factors affecting the chemical and mechanical stability of RA in CMnSi TRIP steels are discussed. It was suggested that chemical stability plays a more important role at low strains, whereas other factors become responsible for RA behavior at higher strains. The importance of optimizing the processing parameters to achieve the desirable level of austenite stability is highlighted. Finally, the influence of mechanical testing conditions and the interaction between the phases during tensile testing are also detailed. ABSTRACTThe deformation-induced phase transformation of metastable austenite to martensite is accompanied by macroscopic plastic strain and results in significant work hardening and the delayed onset of necking. Steels that exhibit such transformation-induced plasticity (TRIP) effect possess high strength-ductility ratios and improved toughness. Since the stability of the retained austenite phase is the rate controlling mechanism for the TRIP effect, the factors affecting the chemical and mechanical stability of retained austenite in CMnSi TRIP steels are discussed. It was suggested that chemical stability plays a more important role at low strains, whereas other factors become responsible for the RA behavior at higher strains. The importance of optimising the processing parameters to achieve the desirable level of austenite stability was highlighted. Finally, the influence of mechanical testing conditions and the interaction between the phases during tensile testing are also detailed.Eds. R. Colás and G. E. Totten, chapter TRIP effect and retained austenite stability in steels 2

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“…During deformation, the austenite phase progressively transforms to martensite resulting in improved ductility and strength. Due to the remarkable improvement in properties, the TRIP phenomenon was thoroughly investigated and modelled by Olson, Cohen and Stringfellow [2][3][4][5] and later by Iwamoto, Tomita et al [6][7][8][9] The authors reported on the influence of strain rate, stress state and temperature on the kinetics of the martensitic transformation. The focus on the transformation kinetics is due to its direct influence on the mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Systematic Characterization of the Crashworthiness Properties of Low Alloys Silicon Bearing TRIP Steels

Dabboussi

Nemes

2013

ISIJ Int.

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Metallurgical and mechanical properties of two low alloy, TRIP assisted, multi-phase steels are investigated. Tension and compression experiments are performed over a range of strain rates and temperatures to determine the kinetics of the austenite to martensite transformation. The volume fraction of retained austenite is measured using neutron diffraction which provides measurements of high accuracy. Results are used to assess the energy absorption characteristics of the steels for use in crashworthiness evaluations.

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Transformation behavior of TRIP steels

Cited by 179 publications

References 8 publications

Stress-assisted isothermal martensitic transformation: Application to TRIP steels

Stress-assisted isothermal martensitic transformation: Application to TRIP steels

Retained Austenite: Transformation-Induced Plasticity

Systematic Characterization of the Crashworthiness Properties of Low Alloys Silicon Bearing TRIP Steels

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