We can't find the internet
Attempting to reconnect
Something went wrong!
Hang in there while we get back on track
Shear Transformation of Austenite in Steels Considering Stresses’ Effects
Summary
This study reviews the known mechanisms of martensitic transformation in steel during cooling, analyzing kinetic models under stress conditions and proposing an improved Koistinen-Marburger equation that accounts for the minimum stress threshold required for crystallogeometrically ordered iron atom displacement during martensite formation.
The currently known main mechanisms of martensitic transformation of austenite in steel during cooling, physical models, and schemes of shear rearrangement of the iron crystal lattice during transformation under the action of internal stresses are considered. An analysis of the available kinetic model of the shear transformation of austenite in steel is carried out considering the influence of stresses. As shown, for the transformation of retained austenite into martensite, two main conditions have to be fulfilled. The first one is thermodynamic condition due to decreasing the temperature of the steel down to the temperature of the end of the transformation of retained austenite. The second condition is kinetic one due to increasing the level of internal stresses in austenite, the cooling rate at the final treatment stage or mechanical impact. To calculate the effect of stresses on the transformation of retained austenite in steel, a new equation is proposed that takes into account the minimum stress required for a crystallogeometrically ordered displacement of fe atoms during the formation of martensite. As shown, the effect of alloying elements and cooling rate on the temperature of the beginning and end of the austenite transformation can be calculated using the relations given in the article. To calculate the quantity of martensite formed depending on the transfor mation temperature, an improved Koistinen-Marburger equation is suggested. This equation takes into account not only the temperature of the beginning, but also the temperature of the end of the austenite transformation, i.e., increases the accuracy of the obtained result.
Sign in to start a discussion.
More Papers Like This
Mechanical Behavior of Multi-Phase Steels Comprising Retained Austenite
Researchers developed a physics-based kinetic model incorporating thermodynamic driving force to predict retained austenite transformation and transformation-induced plasticity in dual-phase advanced high-strength steels, incorporating the model into a self-consistent mean-field constitutive framework.
The quantitative relationship between non-linear stress-strain behaviour and dislocation structure in martensitic stainless steel
Researchers showed that martensitic stainless steel behaves in a more complex, non-linear way at low stresses than previously assumed, and developed a refined model to quantify tiny reversible deformations caused by dislocation movement, with implications for precision industrial applications where small strains matter.
High Strain Rate and Stress-State-Dependent Martensite Transformation in AISI 304 at Low Temperatures
Researchers investigated deformation-induced martensitic transformation in AISI 304 austenitic steel under high strain rates (greater than 10^3 s^-1) and varying stress states at low temperatures relevant to cryogenic cutting applications. They found that higher strain rates under tensile loading decreased alpha-prime martensite content due to adiabatic heating, while shear stress conditions produced lath-like martensite morphology.
Tuning Bainitic Microstructures by Complex Thermo-mechanical Treatments under Constant Stress
Researchers investigated ausforming thermomechanical treatments on bainitic steels under constant applied stress, examining how mechanical driving force affects bainitic ferrite plate thickness, volume percentage, and variant selection during displacive transformation.
Stability of retained austenite in high carbon steel under compressive stress: an investigation from macro to nano scale
This materials science study investigates how retained austenite in high-carbon steel behaves under compressive stress at both macro and nano scales, using electron microscopy and diffraction techniques. The research addresses industrial steel performance and has no direct connection to microplastics or environmental health.