scholarly journals Time-Temperature-Transformation, Temperature-Conversion-Transformation, and Continuous-Heating-Transformation Diagrams of Reversible Covalent Polymer Networks

2020 ◽  
Author(s):  
Jessica Mangialetto ◽  
Robrecht Verhelle ◽  
Guy Van Assche ◽  
Niko Van den Brande ◽  
Bruno Van Mele
Keyword(s):  
Transformation Temperature ◽  
Polymer Networks ◽  
Continuous Heating ◽  
Temperature Transformation ◽  
Reversible Covalent ◽  
Transformation Diagrams

Optical fiber-drawing temperature of fluorogallate glasses

1996 ◽  
Vol 11 (10) ◽  
pp. 2633-2640 ◽  
Author(s):  
S. Suriñach ◽  
E. Illekova ◽  
G. Zhang ◽  
M. Poulain ◽  
M.D. Baró
Keyword(s):  
Optical Fiber ◽  
Growth Process ◽  
Crystallization Behavior ◽  
Continuous Heating ◽  
Fiber Drawing ◽  
Drawing Temperature ◽  
Optical Fiber Drawing ◽  
Temperature Transformation ◽  
Transformation Diagrams ◽  
Temperature Heating

The thermal properties and the crystallization behavior of fluorogallate-based glasses were analyzed. The kinetic nature of the glass transition was used to determine the temperature dependence of the viscosity and from it an estimation of the appropriate drawing temperature for an optical fiber was established. The crystallization kinetics were studied by using both isothermal and continuous heating regimes. The temperature range for nucleation was evaluated and for samples previously nucleated the activation energy of the growth process was found. The results were used to estimate the empirical nucleation and crystal growth rates from which the time-temperature-transformation curves and the temperature-heating rate-transformation diagrams were constructed. The results obtained agree with experimental data and are discussed in the light of minimizing the volume of crystals formed during fiber drawing.

Description of short time phase transformations during the heating of steels based on high-rate experimental data

2004 ◽  
Vol 120 ◽  
pp. 591-598
Author(s):  
T. Mioković ◽  
J. Schwarzer ◽  
V. Schulze ◽  
O. Vöhringer ◽  
D. Löhe
Keyword(s):  
Phase Transformations ◽  
High Rate ◽  
Temperature Fields ◽  
Continuous Heating ◽  
Heating Rates ◽  
Temperature Changes ◽  
Steel Aisi ◽  
Temperature Transformation ◽  
Transformation Diagrams ◽  
Short Time

During surface hardening of steels like laser hardening, rapid thermal changes are imposed to the material. The modelling of these hardening processes allows the determination of time-dependent temperature fields and phase transformations within the affected zones. While there are many investigations on the transformation behaviour during cooling, there is a lack of data concerning the transformation during heating at very high heating rates. Therefore, experiments simulating the fast temperature changes are necessary to implement the effects of short time phase transformation during hardening into simulation. In this paper the effect of heating rates up to 10000 K/s on the austenitizing behaviour of the steel AISI 4140 (German grade 42CrMo4) are presented and described using an Avrami-function. The results obtained are summarized in time-temperature-transformation diagrams for continuous heating and isothermal time-temperature-transformation diagrams which may be used as input data for the simulation.

Reaction-induced phase separation in poly(butylene terephthalate)-epoxy systems: 1. Conversion-temperature transformation diagrams

Polymer ◽  
1996 ◽  
Vol 37 (14) ◽  
pp. 3079-3085 ◽  
Author(s):  
P.A. Oyanguren ◽  
P.M. Frontini ◽  
R.J.J. Williams ◽  
E. Girard-Reydet ◽  
J.P. Pascault
Keyword(s):  
Phase Separation ◽  
Butylene Terephthalate ◽  
Temperature Transformation ◽  
Transformation Diagrams ◽  
Epoxy Systems ◽  
Conversion Temperature

Experimental petrology, Reconstruction of rock cooling paths from kinetic data on the Fe 2 +—Mg exchange reaction in anthophyllite

1977 ◽  
Vol 286 (1336) ◽  
pp. 303-311 ◽  
Keyword(s):  
Simple Model ◽  
Exchange Reaction ◽  
Kinetic Data ◽  
Experimental Petrology ◽  
Cooling Rates ◽  
Temperature Transformation ◽  
Transformation Diagrams ◽  
Kinetics Of

The kinetics of the intracrystalline Fe-Mg exchange reaction in anthophyllite can be described by a simple model that permits extrapolation to lower temperatures. Rock cooling rates can be estimated in the vicinity of 300 °C from these data using time-temperature-transformation diagrams. Aluminous orthoamphiboles (gedrites) are expected to yield rock cooling rates at higher temperatures.

Solidification Modeling of Bulk Amorphous Alloys

2003 ◽  
Vol 806 ◽  
Author(s):  
Sang Bok Lee ◽  
Nack J. Kim
Keyword(s):  
Heterogeneous Nucleation ◽  
Amorphous Alloys ◽  
Nucleation Theory ◽  
Cooling Rates ◽  
Continuous Cooling ◽  
Wide Range ◽  
Temperature Transformation ◽  
Transformation Diagrams ◽  
Experimental Values ◽  
Kinetics Of

ABSTRACTClassical heterogeneous nucleation theory coupled with DTA data has been used to closely estimate the crystallization behavior of continuously cooled bulk metallic glass (BMG) alloys. Continuous cooling transformation and time temperature transformation diagrams of three BMG alloys, Zr41.2Ti13.8Cu12.5Ni10Be22.5, Cu47Ti33Zr11Ni6Si1Sn2 and Mg65Cu25Y10 alloys, have been calculated. The critical cooling rates Rc of three alloys were calculated to be 1.7 K/s, 242 K/s and 36 K/s for Zr41.2Ti13.8Cu12.5Ni10Be22.5, Cu47Ti33Zr11Ni6Si1Sn2 and of Mg65Cu25Y10 alloys, respectively, which match well with the experimental values. We conclude that heterogeneous nucleation is more favorable than homogeneous nucleation for the formation of crystals during cooling of BMG alloy liquids. Our approach can be applied to the analyses of crystallization kinetics of BMG alloys with a wide range of critical cooling rates during continuous cooling as well as isothermal annealing.

Determination of new time–temperature-transformation diagrams for lead–calcium alloys

2008 ◽  
Vol 185 (2) ◽  
pp. 1465-1470 ◽  
Author(s):  
F. Rossi ◽  
M. Lambertin ◽  
L. Delfaut-Durut ◽  
A. Maitre ◽  
M. Vilasi
Keyword(s):  
Temperature Transformation ◽  
Transformation Diagrams ◽  
New Time
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