Journal ArticleDOI
Effect of weld metal chemistry and heat input on the structure and properties of duplex stainless steel welds
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TLDR
In this article, a low heat input process viz., EBW and another commonly employed process, gas tungsten-arc welding have been employed for welding of duplex stainless steels with and without nickel enhancement.Abstract:
The excellent combination of strength and corrosion resistance in duplex stainless steels (DSS) is due to their strict composition control and microstructural balance. The ferrite–austenite ratio is often upset in DSS weld metals owing to the rapid cooling rates associated with welding. To achieve the desired ferrite–austenite balance and hence properties, either the weld metal composition and/or the heat input is controlled. In the current work, a low heat input process viz., EBW and another commonly employed process, gas tungsten-arc welding have been employed for welding of DSS with and without nickel enhancement. Results show that (i) chemical composition has got a greater influence on the ferrite–austenite ratio than the cooling rate, (ii) and even EBW which is considered an immature process in welding of DSS, can be employed provided means of filler addition could be devised.read more
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Journal ArticleDOI
Profiling Microstructure Evolution Roadmap in Heat-Affected Zones of EH36 Shipbuilding Steel Under Controlled Thermal Simulation
TL;DR: In this article, microstructures transform from fine bainite accompanied by acicular ferrite at low heat input, to coarse bainites at medium heat input and polygonal ferrite and pearlite at high heat input.
Journal ArticleDOI
Metallurgical influence of multi-beam technology on duplex stainless steel welds
TL;DR: In this article, the electron multi-beam welding of duplex stainless steels (DSS) was investigated and the resulting austenite formation, mechanical properties and the corrosion resistance of the electron multibeam welds were investigated.
Journal ArticleDOI
Effect of isothermal aging at 750 °C on microstructure and mechanical properties of UNS S32101 lean duplex stainless steel
TL;DR: In this article, the effect of aging at 750°C (up to 480h) on microstructure and mechanical properties of lean duplex stainless steel has been systematically studied.
Journal ArticleDOI
Effect of Al on Microstructure and Properties of Hot-Rolled 2205 Dual Stainless Steel
TL;DR: The microstructure, mechanical properties, oxidation, and corrosion resistance of 2205 stainless steels without and with Al in a range of 0.5 to 2.5 % were investigated in this paper.
Journal ArticleDOI
Characterization of the Austenite Reformation Mechanisms as a Function of the Initial Ferritic State in a UNS S32304 Duplex Stainless Steel
Charles Henrique Xavier Morais Magalhães,Geraldo Lúcio de Faria,Leonardo Evangelista Lagoeiro,Jéssica Dornelas Silva +3 more
TL;DR: In this paper, the effects of heat treatment parameters on Ferrite-Austenite phase transformation in a 2304 duplex stainless steel different thermal cycles were applied to this steel in a quenching dilatometer and the obtained microstructures were characterized by optical microscopy, transmission electron microscopy and electron backscatter diffraction.
References
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Duplex stainless steels : microstructure, properties and applications
TL;DR: In this paper, the authors present a non-destructive testing of welds for service experience, based on the application of service experience in metallurgy and metallurgical applications.