scholarly journals TIME-TEMPERATURE-TRANSFORMATION DIAGRAMS FOR THE SLUDGE BATCH 3 - FRIT 418 GLASS SYSTEM

2009 ◽  
Author(s):  
A Billings ◽  
T Tommy Edwards
Keyword(s):  
Glass System ◽  
Temperature Transformation ◽  
Transformation Diagrams

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

The growth of calcium metasilicate polymorphs from supercooled melts and glasses

1978 ◽  
Vol 42 (323) ◽  
pp. 325-335 ◽  
Author(s):  
R. M. Weston ◽  
P. S. Rogers
Keyword(s):  
Experimental Data ◽  
Crystal Growth ◽  
Amorphous Phase ◽  
Activation Energies ◽  
Heat Treatments ◽  
Temperature Transformation ◽  
Isothermal Heat Treatments ◽  
Transformation Diagrams ◽  
Anionic Groups

SummaryThe morphology of calcium metasilicate produced during the crystallization of glasses and melts of approximately metasilicate composition has been investigated. Both isothermal heat treatments and a dynamic crystal-pulling technique were employed. The crystallization took place by a dendritic or spherulitic mechanism, according to which of the crystal polymorphs is stable under the prevailing conditions. The morphology of the crystals is controlled by the ease with which the anionic groups present in the amorphous phase can be incorporated into the growing crystals. This is reflected in the values of the activation energies of crystal growth found for α-CaSiO3 (160 kJ mol−1) and for β-CaSiO3 (319 to 383 kJ mol−1). The Keith and Padden theory of spherulitic crystallization was verified for the growth of β-CaSiO3 over a range of supercoolings. Time-temperature-transformation diagrams have been constructed from the experimental data.

scholarly journals Austenite Decomposition and Precipitation Behavior of Plastically Deformed Low-Si Microalloyed Steel

Metals ◽  
2018 ◽  
Vol 8 (12) ◽  
pp. 1028 ◽  
Author(s):  
Adam Grajcar ◽  
Mateusz Morawiec ◽  
Wladyslaw Zalecki
Keyword(s):  
Hot Deformation ◽  
Volume Fraction ◽  
Precipitation Process ◽  
Austenite Decomposition ◽  
Continuous Cooling Transformation ◽  
Continuous Cooling ◽  
Complex Interactions ◽  
Cooling Schedules ◽  
Temperature Transformation ◽  
Transformation Diagrams

The aim of the present study is to assess the effects of hot deformation and cooling paths on the phase transformation kinetics in a precipitation-strengthened automotive 0.2C–1.5Mn–0.5Si steel with Nb and Ti microadditions. The analysis of the precipitation processes was performed while taking into account equilibrium calculations and phase transitions resulting from calculated time–temperature–transformation (TTT) and continuous cooling transformation (CCT) diagrams. The austenite decomposition was monitored based on thermodynamic calculations of the volume fraction evolution of individual phases as a function of temperature. The calculations were compared to real CCT and DCCT (deformation continuous cooling transformation) diagrams produced using dilatometric tests. The research included the identification of the microstructure of the nondeformed and thermomechanically processed supercooled austenite products formed at various cooling rates. The complex interactions between the precipitation process, hot deformation, and cooling schedules are linked.

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