Journal ArticleDOI
Solidification sequences in stainless steel dissimilar alloy welds
TLDR
In this article, a series of laser and gas tungsten arc welds traversing stainless steels of different chemical compositions has been studied, to elucidate the role of austenite or ferrite nucleation and cooling rate on solidification behaviour.Abstract:
A series of laser and gas tungsten arc welds traversing stainless steels of different chemical compositions has been studied, to elucidate the role of austenite or ferrite nucleation and cooling rate on solidification behaviour. It has been found that a steel with a high CrEQ/NiEQ ratio can be induced to solidify as metastable austenite by initiating the weld in a steel with a lower CrEQ/NiEQ ratio in which the thermodynamically stable solidification mode is austenitic. The austenite dendrites are then found to continue growth across the weld junction into the undiluted regions of the high CrEQ/NiEQ ratio material. By providing austenite particles in this way, nucleation is rendered unnecessary and it is found that solidification to metastable austenite can be induced at cooling rates significantly lower than previously encountered. The results of these and other experiments in which the welding speed was changed during the experiment are interpreted to yield new information about the mechanisms o...read more
Citations
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Critical review of automotive steels spot welding: process, structure and properties
TL;DR: In this article, the fundamental understanding of structure-properties relationship in automotive steels resistance spot welds is discussed. And a brief review of friction stir spot welding, as an alternative to RSW, is also included.
Journal ArticleDOI
Welding: Solidification and microstructure
TL;DR: In this paper, various physical processes that occur due to the interaction of the heat source with the metal during welding add a new dimension to the understanding of the weld pool solidification.
Journal ArticleDOI
Solidification cracking in austenitic stainless steel welds
TL;DR: In this paper, the WRC-92 diagram is used as a general guide to maintain a desirable solidification mode during welding, which is a significant problem during the welding of austenitic stainless steels.
Journal ArticleDOI
Microstructural features of dissimilar welds between 316LN austenitic stainless steel and alloy 800
TL;DR: In this article, the weld fusion zones and the interfaces with the base materials were characterised in detail using light and transmission electron microscopy, showing that the stainless steel weld metals solidified dendritically, while the 16-8-2 (16%Cr-8%Ni-2%Mo) weld metal showed a predominantly cellular substructure.
Journal ArticleDOI
Stainless steel weld metal designed to mitigate residual stresses
TL;DR: In this paper, alloy design methods have been used to create a stainless steel welding consumable which solidifies as δ ferrite, transforms almost entirely into austenite which then undergoes martensitic transformation at a low temperature of about 220°C.
References
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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.
Book
Introduction to the physical metallurgy of welding
TL;DR: The second edition has been updated and expanded to cover new topics such as the numerical analytical techniques now being used in industry as mentioned in this paper, which should be of use to welding professionals and those studying metallurgy and materials science.
Journal ArticleDOI
Development of microstructures in Fe-15Ni-15Cr single crystal electron beam welds
TL;DR: A detailed analysis of the microstructures produced in an autogenously welded single crystal of Fc−15Ni−15Cr was performed in order to investigate the relationship between growth crystallography and solidification behavior as mentioned in this paper.
Journal ArticleDOI
Microstructural modification of austenitic stainless steels by rapid solidification
TL;DR: In this article, the microstructural modifications in three austenitic stainless steels (types 308, 310, and 312) were evaluated after rapid solidification, and autogenous laser welding and arc-hammer splat quenching were investigated.
Journal ArticleDOI
Tracer diffusion of59Fe and51Cr in Fe-17 Wt Pet Cr-12 Wt Pet Ni austenitic alloy
TL;DR: In this paper, the volume and grain-boundary diffusion of an austenitic iron alloy containing 17 wt pct Cr and 12 wt Pct Ni was studied.
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