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A fundamental study of the microstructural development of superaustenitic stainless steel and Ni-base alloys in casting and conventional arc welds
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In this article, the authors propose a method to solve the problem of "uniformity" and "uncertainty" in the context of video games.2.3.2Abstract:
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Journal ArticleDOI
Precipitation behavior of the sigma phase with Ni and Mn content variations in superaustenitic stainless steel weld metal
TL;DR: In this paper, the precipitation behavior of the sigma phase with variations of the Ni and Mn in superaustenitic stainless steel weld metal was evaluated focused on microstructure and thermodynamic analysis.
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Possibility of Mn substitution of Ni through evaluation of mechanical properties and corrosion resistance in superaustenitic stainless steel weld metal
TL;DR: In this paper, the authors evaluated the mechanical and corrosion properties of Ni, Mn and the possibility of Mn substitution of Ni in superaustenitic stainless steel weld metal were researched Axial tensile, polarization, and critical pitting temperature (CPT) tests were performed with variation of Ni and Mn to evaluate the mechanical properties for the gas tungsten arc welding (GTAW)-fabricated weld metals.
Metallurgical behaviour of aisi 304 steel butt welds under segregation
TL;DR: In this article, the authors integrate depictions of fundamental microscopic phenomena of solidification, cooling, grain growth, segregation, metallurgical developments and its significance on mechanical properties for AISI 304 steel.
Non-equilibrium solidification in austenitic stainless steel welds
J.M. Vitek,S.A. David +1 more
Abstract: Recent studies have shown that non-equilibrium solidification may occur in a wide range of stainless steel alloy compositions. The non-equilibrium microstructures that are found are commonly produced in laser and electron beam-welded materials but they can also be observed, in some cases, in welds produced by conventional arc welding. In general, non-equilibrium solidification extends the range of compositions in which fully austenitic or fully ferritic microstructures are observed, while the range over which duplex microstructures are observed is reduced. These experimental results are explained in terms of thermodynamic considerations. Calculations, as well as experimental evidence, indicate that rapid solidification conditions result in sufficient undercooling to allow for competition between primary ferrite and primary austenite solidification. Under such conditions, primary austenite formation is kinetically favored. In addition, rapid cooling can inhibit the equilibrium solid state transformation of ferrite to austenite, leading to the retention of fully ferritic microstructures for some alloy compositions. Finally, over a limited range of compositions, fully austenitic microstructures have been found without any evidence of a solidification substructure. These microstructures may be produced by a massive transformation from ferrite to austenite in the solid state. Alternatively, these microstructures can be explained in terms of solidification behavior. Furthermore » research is required to clarify this subject. 42 refs., 7 figs., 1 tab.« less
References
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Book ChapterDOI
Theory of Microstructural Development during Rapid Solidification
Rohit Trivedi,Wilfried Kurz +1 more
TL;DR: In this article, some of the fundamental factors which play important roles in determining microstructures under rapid solidification condition are described, and it is shown that the interface stability analysis needs to be extended to include the possibility of high thermal as well as high solute undercoolings.
Journal ArticleDOI
Model for solute redistribution during rapid solidification
TL;DR: In this article, a microscopic model for impurity uptake at a sharp crystal liquid interface during alloy solidification is presented in terms of the bulk properties of the liquid and solid phases.
Journal ArticleDOI
Rapid dendrite growth in undercooled alloys
TL;DR: In this article, the theory of dendritic growth into undercooled alloy melts is extended to the case of large undercoolings, i.e. to high growth rates, by applying the results of the complete stability analysis of a plane interface to the tip of an Ivantsov dendrite.
Journal ArticleDOI
Correlation between solidification parameters and weld microstructures
Stan A David,John Michael Vitek +1 more
TL;DR: In this article, a comprehensive review of the solidification behavior of a weld pool incorporating recent advances in solidification theories is provided, including basic principles from ingot, single crystal, and rapid solidification processes.
Journal ArticleDOI
Cellular and dendritic growth. I
M.H. Burden,J.D. Hunt +1 more
TL;DR: In this article, a theoretical model was developed to explain the variation in cellular or dendritic tip temperatures with velocity and temperature gradient, and it was shown that the undercooling can be considered to arise as a result of build up of average solute concentration ahead of the growth front depending mainly on the imposed temperature gradient.