The bainitic transformation kinetics and carbon enrichment of austenite during isothermal holding at 723–923 K were investigated for an Fe-0.1mass%C-0.5mass%Si-2.0mass%Mn alloy. progressed rapidly until approximately 50 s, after which stasis was observed 823 K. concentration increased as the proceeded, showed almost constant value stasis. It reached 0.45-0.50% K, corresponds to T0’ composition ...

The classical theory of solid-state transformation based on nucleation and growth processes, developed by Kolmogorov, Johnson Mehl, Avrami (KJMA theory), is widely used in many different fields research. In KJMA theory, two parameters (the frequency factor and, particularly, the exponent) can supply information about mechanisms involved transformation. Despite its apparent simplicity, one hand,...

Exposing uranium-molybdenum alloys (UMo) retained in the γ phase to elevated temperatures leads to transformation reactions during which the γ-UMo phase decomposes into the thermal equilibrium phases, i.e. U2Mo and α-U. Since α-U is not suitable for a nuclear fuel exposed to high burn-up, it is necessary to retain the γ-UMo phase during the production process of the fuel elements for modern hig...

ÐTransformation superplasticity of an intermetallic Ti3Al-based alloy (Super a2) is demonstrated by thermal cycling about the a2/b transformation temperature range under a uniaxial tensile biasing stress. Failure strains up to 610% were recorded at a stress of 3 MPa, compared with 110% for deformation by isothermal creep at the same stress. The strain increment produced during each half-cycle i...

Deformation under the combined action of external stress and cyclic hydrogen charging/discharging is studied in a model material, titanium. Cyclic charging with hydrogen is carried out at 860 °C, which repeatedly triggers the transformation between hydrogen-lean -Ti and hydrogen-rich -Ti. Due to bias from the externally applied tensile stress, the internal mismatch strains produced by this isot...