Influence of welding parameters on pit initiation and pit growth in welded joints of X5CrNi18-10 stainless steel

Jegdić, Bore; Bobić, Biljana M.; Radojković, Bojana; Alić, Behar

doi:10.1007/s40194-018-0644-0

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…Quenching in the temperature range of 930–1090 °С destroys the columnar microstructure of welds and contributes to the partial dissolution of the ferritic component. Besides the chemical composition of steels and welded joints [40,41], various technological factors and technical operations, such as heat treatment [42,43,44], nitrogen content in shielding gas [45,46,47,48], welding regimes [49], and repeated welding heat [50] etc., also significantly affect the corrosion resistance of welded joints metal. On the other hand, heat treatment can lead to the appearance or removal of welding deformations [51,52,53], and an undesirable change in the phase composition [54].…”

Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Kuryntsev

2019

Materials

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The effect of heat treatment of welded joints made of steel 321 on corrosion resistance, phase composition, residual stresses, and distribution of alloying elements was studied using optical microscope (OM) and scanning electron microscope (SEM), electron dispersive spectroscopy (EDS), X-ray diffraction (XRD), and intergranular corrosion testing (IGC). Samples previously obtained by the authors using defocused laser beam, which led to the formation of directionally crystallized austenite with lathy and skeletal δ-ferrite, were investigated. Based on X-ray diffraction studies in the base metal, the maximum number of peaks of various phases was presented, which decreased after exposure to the heating effect of the welding process and subsequent heat treatment. The distribution of alloying elements, in particular, Ti and Si, was significantly affected by heat treatment depending on the regimes. A spot chemical analysis showed that the nickel content differs in δ-ferrite and austenite by 1.5%–2% whereas the chromium content in these phases is not significantly different. Tests have shown that all samples have high resistance to intergranular corrosion, which can be explained by the insufficient dissolution of titanium carbides in austenite and the absence of chromium carbides formation along austenite grain boundaries, due to high cooling rates when welding by a defocused laser beam, and as a result, the high δ-ferrite content in which chromium dissolves.

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Section: Introductionmentioning

confidence: 99%

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Kuryntsev

2019

Materials

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“…Due to the higher content of chromium and other alloying elements, pitting corrosion rarely occurs in the weld metal. The weld metal resistance to pitting corrosion has been considered in our previous paper …”

Section: Methodsmentioning

confidence: 99%

Influence of the welding current intensity and nitrogen content on the corrosion resistance of austenitic stainless steels

Jegdić

Bobić

Radojković

et al. 2018

Materials & Corrosion

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The resistance to pitting and intergranular corrosion of the welded joint of X5CrNi18‐10 austenitic stainless steel is analyzed in this paper. The resistance of the welded joint to intergranular corrosion does not depend on the nitrogen content in the shielding gas. It depends on the heat input into the welded joint, that is, on the welding current intensity. The resistance to pitting corrosion depends on the content of nitrogen in the shielding gas and on the welding current intensity. With the increase in the nitrogen content in the shielding gas, the resistance of the heat affected zone (HAZ) to pitting corrosion increases. The welding current intensity (heat input into the welded joint) shows two opposite effects. On the one hand, the increase of the heat input into the welded joint causes a more intensive precipitation of chromium carbides along the grain boundaries, which then leads to depletion in chromium of the grain boundary areas. The sensitization degree of the HAZ is thus increased and the formation of pits easier. On the other hand, with the increase in the welding current intensity, diffusion of nitrogen from the weld metal into the HAZ is facilitated, which contributes to the increased HAZ resistance to pitting corrosion. Possible mechanisms for increasing the HAZ resistance to pitting corrosion in the presence of nitrogen are also considered.

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“…The practical essence of E rp is that it is the potential corresponding to which repassivation occurs, which means the growth of pits stops. [46][47][48][49][50] The interpretation of a typical CPP plot is that the potential of the material must exceed E pit for the nucleation of new pits (or localized corrosion sites). At potentials between E pit and E rp , nucleation of new pits does not occur, but the existing pits can grow or propagate.…”

Section: Electrochemical Corrosion Behaviormentioning

confidence: 99%

Electrochemical corrosion behavior and microstructural characteristics of electron beam welded UNS S32205 duplex stainless steel

Singh

Shahi

2021

Materials & Corrosion

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Different electrochemical techniques were used to study the corrosion behavior of UNS S32205 duplex stainless steel (DSS) welded autogenously using a single‐pass by electron beam welding process, supplemented by microstructural characterization. Furthermore, a comparative study was also performed between multipass gas tungsten arc (GTA)‐welded and EB‐welded DSS for their microstructure and corrosion behavior. The differences in weld thermal cycle and chemical composition influenced the fusion zone microstructure of both the welds and eventually their corrosion properties. The general corrosion resistance of the EB weld was lower than the base metal and higher than the GTA weld despite its weld zone being characterized by a relatively unbalanced phase ratio (α/γ) in comparison to the GTA weld. However, the EB weld showed relatively higher susceptibility to pitting corrosion than the base metal and GTA weld due to its poor repassivation characteristics and poor resistance to pit growth.

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Influence of welding parameters on pit initiation and pit growth in welded joints of X5CrNi18-10 stainless steel

Cited by 4 publications

References 26 publications

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Effect of Heat Treatment on the Phase Composition and Corrosion Resistance of 321 SS Welded Joints Produced by a Defocused Laser Beam

Influence of the welding current intensity and nitrogen content on the corrosion resistance of austenitic stainless steels

Electrochemical corrosion behavior and microstructural characteristics of electron beam welded UNS S32205 duplex stainless steel

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