Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless Steels
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 advanta...
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doaj-7d0e73bb86544024993b1cb9a148ea742020-11-24T23:21:00ZengMDPI AGMaterials1996-19442016-07-019760610.3390/ma9070606ma9070606Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless SteelsIon-Dragos Utu0Ion Mitelea1Sorin Dumitru Urlan2Corneliu Marius Crăciunescu3Department of Materials and Manufacturing Engineering, University Politehnica Timisoara, Pta Victoriei, No. 2, Timisoara 300006, RomaniaDepartment of Materials and Manufacturing Engineering, University Politehnica Timisoara, Pta Victoriei, No. 2, Timisoara 300006, RomaniaDepartment of Materials and Manufacturing Engineering, University Politehnica Timisoara, Pta Victoriei, No. 2, Timisoara 300006, RomaniaDepartment of Materials and Manufacturing Engineering, University Politehnica Timisoara, Pta Victoriei, No. 2, Timisoara 300006, RomaniaThe 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.http://www.mdpi.com/1996-1944/9/7/606Duplex stainless steelMAG pulsed weldingstructure |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ion-Dragos Utu Ion Mitelea Sorin Dumitru Urlan Corneliu Marius Crăciunescu |
spellingShingle |
Ion-Dragos Utu Ion Mitelea Sorin Dumitru Urlan Corneliu Marius Crăciunescu Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless Steels Materials Duplex stainless steel MAG pulsed welding structure |
author_facet |
Ion-Dragos Utu Ion Mitelea Sorin Dumitru Urlan Corneliu Marius Crăciunescu |
author_sort |
Ion-Dragos Utu |
title |
Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless Steels |
title_short |
Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless Steels |
title_full |
Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless Steels |
title_fullStr |
Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless Steels |
title_full_unstemmed |
Transformation and Precipitation Reactions by Metal Active Gas Pulsed Welded Joints from X2CrNiMoN22-5-3 Duplex Stainless Steels |
title_sort |
transformation and precipitation reactions by metal active gas pulsed welded joints from x2crnimon22-5-3 duplex stainless steels |
publisher |
MDPI AG |
series |
Materials |
issn |
1996-1944 |
publishDate |
2016-07-01 |
description |
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. |
topic |
Duplex stainless steel MAG pulsed welding structure |
url |
http://www.mdpi.com/1996-1944/9/7/606 |
work_keys_str_mv |
AT iondragosutu transformationandprecipitationreactionsbymetalactivegaspulsedweldedjointsfromx2crnimon2253duplexstainlesssteels AT ionmitelea transformationandprecipitationreactionsbymetalactivegaspulsedweldedjointsfromx2crnimon2253duplexstainlesssteels AT sorindumitruurlan transformationandprecipitationreactionsbymetalactivegaspulsedweldedjointsfromx2crnimon2253duplexstainlesssteels AT corneliumariuscraciunescu transformationandprecipitationreactionsbymetalactivegaspulsedweldedjointsfromx2crnimon2253duplexstainlesssteels |
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