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Materials 2016, 9(7), 606; doi:10.3390/ma9070606

Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless Steels

Department of Materials and Manufacturing Engineering, University Politehnica Timisoara, Pta Victoriei, No. 2, Timisoara 300006, Romania
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Academic Editor: Douglas Ivey
Received: 25 April 2016 / Revised: 24 June 2016 / Accepted: 27 June 2016 / Published: 21 July 2016
(This article belongs to the Section Structure Analysis and Characterization)
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Abstract

The high alloying degree of Duplex stainless steels makes them susceptible to the formation of intermetallic phases during their exposure to high temperatures. Precipitation of these phases can lead to a decreasing of the corrosion resistance and sometimes of the toughness. Starting from the advantages of the synergic Metal Active Gas (MAG) pulsed welding process, this paper analyses the structure formation particularities of homogeneous welded joints from Duplex stainless steel. The effect of linear welding energy on the structure morphology of the welded joints was revealed by macro- and micrographic examinations, X-ray energy dispersion analyses, measurements of ferrite proportion and X-ray diffraction analysis. The results obtained showed that the transformation of ferrite into austenite is associated with the chromium, nickel, molybdenum and nitrogen distribution between these two phases and their redistribution degree is closely linked to the overall heat cycle of the welding process. The adequate control of the energy inserted in the welded components provides an optimal balance between the two microstructural constituents (Austenite and Ferrite) and avoids the formation of undesirable intermetallic phases. View Full-Text
Keywords: Duplex stainless steel; MAG pulsed welding; structure Duplex stainless steel; MAG pulsed welding; structure
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Utu, I.-D.; Mitelea, I.; Urlan, S.D.; Crăciunescu, C.M. Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless Steels. Materials 2016, 9, 606.

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