Rapid Solidification Of Steels

1981 ◽  
Vol 8 ◽  
Author(s):  
Brian Cantor
Keyword(s):  
Solid State ◽  
Heat Flow ◽  
Phase Transformations ◽  
Rapid Solidification ◽  
Thermodynamics And Kinetics ◽  
Iron Based ◽  
Kinetics Of

ABSTRACTThis paper reviews some fundamental aspects of the rapid solidification of iron-based alloys and commercial steels, concentrating on heat flow during cooling, the thermodynamics and kinetics of solidification, post-solidification solid state phase transformations, and the effect of these processes on the resulting steel microstructures.

Numerical Simulation of Deformations in T-Joint Welded by the Laser Beam

2013 ◽  
Vol 58 (4) ◽  
pp. 1391-1396 ◽  
Author(s):  
W. Piekarska ◽  
M. Kubiak ◽  
Z. Saternus
Keyword(s):  
Numerical Simulation ◽  
Solid State ◽  
Laser Beam ◽  
Phase Transformations ◽  
Laser Beam Welding ◽  
Thermomechanical Properties ◽  
Engineering Software ◽  
Kinetics Of ◽  
Fortran Programming Language ◽  
Structural Strain

Abstract Numerical simulation of deformations in laser welded T-joint is carried out in this study. The analysis is performed using Abaqus FEA engineering software. Additional author’s numerical subroutines, written in FORTRAN programming language are used in computer simulations where models of the distribution of movable laser beam heat source, kinetics of phase transformations in solid state as well as thermal and structural strain are implemented. Thermomechanical properties of welded material changing with temperature are taken into account in the analysis. Presented results of numerical simulations performed for the laser beam welding of two perpendicularly arranged sheets include temperature distribution, kinetics of phase transformations in solid state, thermal and structural strain as well as estimated welding deformations.

Analysis of Interface Dynamics in Solid-State Phase Transformations by In Situ Hot-Stage High-Resolution Transmission Electron Microscopy

1994 ◽  
Vol 332 ◽  
Author(s):  
James M. Howe ◽  
W. E. Benson ◽  
A. Garg ◽  
Y.-C. Chang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Solid State ◽  
High Resolution ◽  
Phase Transformations ◽  
Interface Motion ◽  
Transmission Electron ◽  
Kinetics Of ◽  
Dynamics Of Interfaces

ABSTRACTIn situ hot-stage high-resolution transmission electron microscopy (HRTEM) provides unique capabilities for quantifying the dynamics of interfaces at the atomic level. Such information is critical for understanding the theory of interfaces and solid-state phase transformations. This paper provides a brief description of particular requirements for performing in situ hot-stage HRTEM, summarizes different types of in situ HRTEM investigations and illustrates the use of this technique to obtain quantitative data on the atomic mechanisms and kinetics of interface motion in precipitation, crystallization and martensitic reactions. Some limitations of in situ hot-stage HRTEM and future prospects of this technique are also discussed.

A Mixed-Mode Model Considering Soft Impingement Effects for Solid-State Partitioning Phase Transformations

2011 ◽  
Vol 172-174 ◽  
pp. 561-566 ◽  
Author(s):  
Hao Chen ◽  
Sybrand van der Zwaag
Keyword(s):  
Phase Transformation ◽  
Solid State ◽  
Numerical Solution ◽  
Phase Transformations ◽  
Concentration Gradient ◽  
Mixed Mode ◽  
Original Model ◽  
Polynomial Method ◽  
Soft Impingement ◽  
Kinetics Of

The original mixed-mode model is reformulated by considering the soft impingement effect and applying a general polynomial method of dealing with the concentration gradient in front of the interface. Comparison with the numerical solution shows that the reformulated mixed-mode model is more precise than the original model. The effect of soft impingement on the kinetics of partitioning phase transformation depends on both the growth mode and the degree of super-saturation.

Phase Transformations and Interstitial Atom Diffusion in Iron-Nitride, Iron-Carbonitride and Iron-Carbide Layers

2006 ◽  
Vol 46 ◽  
pp. 32-41 ◽  
Author(s):  
Andreas Leineweber ◽  
Tatiana Liapina ◽  
Thomas Gressmann ◽  
Marc Nikolussi ◽  
Eric J. Mittemeijer
Keyword(s):  
Solid State ◽  
Phase Transformations ◽  
Interstitial Atom ◽  
Iron Carbide ◽  
Layer Growth ◽  
Iron Nitrides ◽  
Iron Nitride ◽  
Study Phase ◽  
Atom Diffusion ◽  
Kinetics Of

α-Iron foils were exposed to various gas atmospheres containing all or a number of the components NH3, CO, H2 and N2 for different periods of time at 550°C. In this way surficial compound layers were generated which contain different iron nitrides (ε, γ’), iron carbonitride (ε) and/or iron carbide (cementite, Fe3C). These compound layers were used to study phase transformations associated with N- and/or Cdiffusion processes in the corresponding phases. These studies involved (a) the layer-growth kinetics of cementite and (b) various solid-state phase transformations occurring in compound layers upon annealing in vacuum.

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