Evolution of transformation plasticity during bainitic transformation
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Hans-Gerd Lambers
Abstract
The influences of prior austenitization treatment and the state of applied stresses on the evolution of transformation plasticity strains during isothermal bainitic phase transformation and the resulting microstructures were examined. The key finding is that, upon pre-straining, the amount of transformation plasticity strain under superimposed elastic stresses is dictated by both the prior austenite grain size and the (0.01 % offset) yield strength of the supercooled austenite. Furthermore, the superimposition of internal stresses present due to pre-straining and externally applied stresses results in transformation plasticity strains similar to those obtained when a permanent stress equivalent to the 0.01 % offset yield strength of the supercooled austenite is applied. Another important result is that lower transformation plasticity strains were observed when decreasing the austenite grain size, which is accompanied by an increase in grain boundary area per volume, hindering the growth of preferred variants. Overall, the results clearly lay out the influence of austenite grain size and the particular 0.01 % offset yield strength of the supercooled austenite in limiting the transformation plasticity strains, which has to be incorporated into current models involving bainitic phase transformations.
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© 2011, Carl Hanser Verlag, München
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Prof. Dr.-Ing. Heinrich Wollenberger — 80 years
- Original Contributions
- Atom probe tomography: from physical metallurgy towards microelectronics
- Accumulation of radiation damage and disordering in MgAl2O4 under swift heavy ion irradiation
- TEM study of irradiation induced copper precipitation in boron alloyed EUROFER97 steel
- Order – disorder transformation in Ni – V alloys under electron irradiation
- Materials issues of the SINQ high-power spallation target
- The origin and development of the P{011}<111> orientation during recrystallization of particle-containing alloys
- Coarsening kinetics of Cu-rich precipitates in a concentrated multicomponent Fe–Cu based steel
- Beyond Ni-based superalloys: Development of CoRe-based alloys for gas turbine applications at very high temperatures
- The effect of heat treatments on the microstructure, texture and mechanical properties of the extruded magnesium alloy ME21
- Analysing SANS data to determine magnetisation reversal processes in composite perpendicular magnetic recording media using TEM images
- Dislocationless sliding in a polycluster glass
- Evolution of transformation plasticity during bainitic transformation
- Surface tension and viscosity of NiAl catalytic precursor alloys from microgravity experiments
- Synthesis of carbon nanotubes by fine Ni particles in Ni3Al foam
- Fabrication of dielectric thin films by sputtering deposition at different pressures with (Ba0.3Sr0.7)(Zn1/3Nb2/3)O3 ceramic as target
- DGM News
- DGM News
Artikel in diesem Heft
- Contents
- Contents
- Editorial
- Prof. Dr.-Ing. Heinrich Wollenberger — 80 years
- Original Contributions
- Atom probe tomography: from physical metallurgy towards microelectronics
- Accumulation of radiation damage and disordering in MgAl2O4 under swift heavy ion irradiation
- TEM study of irradiation induced copper precipitation in boron alloyed EUROFER97 steel
- Order – disorder transformation in Ni – V alloys under electron irradiation
- Materials issues of the SINQ high-power spallation target
- The origin and development of the P{011}<111> orientation during recrystallization of particle-containing alloys
- Coarsening kinetics of Cu-rich precipitates in a concentrated multicomponent Fe–Cu based steel
- Beyond Ni-based superalloys: Development of CoRe-based alloys for gas turbine applications at very high temperatures
- The effect of heat treatments on the microstructure, texture and mechanical properties of the extruded magnesium alloy ME21
- Analysing SANS data to determine magnetisation reversal processes in composite perpendicular magnetic recording media using TEM images
- Dislocationless sliding in a polycluster glass
- Evolution of transformation plasticity during bainitic transformation
- Surface tension and viscosity of NiAl catalytic precursor alloys from microgravity experiments
- Synthesis of carbon nanotubes by fine Ni particles in Ni3Al foam
- Fabrication of dielectric thin films by sputtering deposition at different pressures with (Ba0.3Sr0.7)(Zn1/3Nb2/3)O3 ceramic as target
- DGM News
- DGM News
