Journal ArticleDOI
Effect of weld metal chemistry and heat input on the structure and properties of duplex stainless steel welds
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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
Transformaciones Microestructurales en Soldaduras Disímiles de Acero Inoxidable Austenítico con Acero Inoxidable Ferrítico
TL;DR: In this article, a trabajo se estudian los fenomenos metalurgicos that ocurren in the soldadura SMAW of un acero inoxidable ferritico AISI 430 with an acero-inoxidable austenitico A ISI 316L.
Journal ArticleDOI
Pitting Corrosion Behavior in Laser Weld Metals of 2205 DSS with Continuous Heat Treatment
TL;DR: Pitting corrosion behavior in laser weld metals of 2205 DSS with continuous heat treatment was investigated by cyclic polarization tests in a 3.5% NaCl solution at room temperature as discussed by the authors.
Journal ArticleDOI
Investigation of Microstructure and Mechanical Properties of DSS 2205 Weld Thick Section for Pressure Vessel Application
TL;DR: In this article, the microstructure and mechanical properties of DSS 2205 thick (20mm) plate weld for pressure vessel by multi-pass shielded metal arc welding using E2209 electrode to maintain heat input 0.5-1.5kJ/mm.
Journal ArticleDOI
Addition of Nickel by the Watts Bath as a Way to Correct the Phase Balance on Nd:YAG Pulsed-Laser-Welded UNS S32750
Eli Jorge da Cruz Junior,Bruna B. Seloto,Vicente Afonso Ventrella,Alessio Giorgio Settimi,Claudio Gennari,Irene Calliari,Andrea Zambon +6 more
TL;DR: In this article, the use of the Watts bath was used to correct the undesirable unbalanced microstructure resulting from SDSS laser welding, as the austenite percentage increased.
Journal ArticleDOI
Grain Boundaries and Phases Identification of Metallographic Images by a Normalized Sobel Operation and the Edge Thinning Process for Further Numerical Simulation
TL;DR: In this article, a Sobel operator is used to identify edges, which is normalized by different proposed Gaussian filters (on intensity, rugosity, or both) to discretize the edges, and then the phase is selected by averaging color of each delimited grain.
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.