Nanostructured bainite was obtained in high-carbon Si-Al-rich steel by low-temperature (220-260 °C) isothermal transformation after austenitisation at different temperatures (900 °C, 1000 °C, and 1150 °C). Improved strength-ductility-toughness balance was achieved in the nanostructured bainitic steel austenitised at low temperatures (900 °C and 1000 °C). Increasing the austenitising temperature...

High-pressure (0.8 gigapascals) granulite facies garnet from Gore Mountain, New York, hosts multiple solid inclusions containing the low-pressure silica polymorph cristobalite along with albite and minor ilmenite. Identification of cristobalite is based on Raman spectra, electron microprobe analysis, and microthermometric measurements on the alpha/beta phase transformation. The cristobalite plu...

Thermophysical bases of vitrification and crystallization are discussed in terms of the enthalpy versus temperature diagram and its derivative (DTA) illustrating relaxation and glass transformation as well as crystallization of glassy and amorphous states to form stable and metastable phases. Non-isothermal kinetics are thoroughly discussed and the use of one(JMAEK) and two(SB) parameter equati...

This work aims to study the elastocaloric effect in a Cu-Al-Zn shape memory alloy sample. The elastocaloric effect refers to the reversible thermal response (isothermal entropy change, or adiabatic temperature change) of a body when subjected to a uniaxial stress. To measure the entropy change of the martensitic transformation, differential scanning calorimetry technique has been used. The calo...

The microstructure of a steel is often developed by solid-state transformation from austenite. The major transformation products are allotriomorphic ferrite, pearlite, Widmanstätten ferrite, bainite and martensite, differentiated by morphological features, and their nucleation and growth mechanisms. A steel often consists of several phases as a result of dynamic evolution during continuous cool...

In this study, three-dimensional finite-element (FE) analyses were carried out to predict the volume fractions of various phases generated during the quenching process of plain-carbon steel and the temperature history, considering the latent heat generated due to phase transformation. Diffusional phase transformation for a nonisothermal process was described by discretizing the cooling curve in...

We perform discrete-event molecular dynamics simulations of a system of particles interacting with a spherically-symmetric (isotropic) two-scale Jagla pair potential characterized by a hard inner core, a linear repulsion at intermediate separations, and a weak attractive interaction at larger separations. This model system has been extensively studied due to its ability to reproduce many thermo...

Abstract Ni 55 Fe 19 Ga 26 ribbons obtained by melt-spinning technique exhibit a martensitic transformation from L2 1 cubic austenite phase to 14 M martensite above room temperature. We have taken advantage of the existence thermal hysteresis transition (~ 11 K) analyze effect isothermal treatments on reverse transformation, which has been analyzed means interrupted heating using differential s...

Large lattice distortion is the design idea to obtain a high elastocaloric effect of shape memory alloys. In present work, new method He ion irradiation used large distortion, resulting in 6.5 K adiabatic temperature Ti-Ni microwires, compared 2.9 unirradiated sample. addition, isothermal entropy change 68 J/kg·K at 293 K, which twice as that alternatives. The microwires have larger unit cell a...

The stress development in the iron oxide scale formed on pure Fe during isothermal oxidation at 700 °C followed by transformation 500 or 380 was measured situ high-temperature X-ray diffraction with sin2? method. eutectoid resulted compressive generation Fe3O4 and structure. This relaxed heat treatment after reaction. ascribed primarily to volume changes associated and/or reduction of interface...