Influence of delta ferrite on corrosion susceptibility of AISI 304 austenitic stainless steel

Osoba, L.O.; Elemuren, Raheem; Ekpe, I.C.

doi:10.1080/23311916.2016.1150546

Cited by 12 publications

(12 citation statements)

References 5 publications

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“…Figure 2 shows the microstructure obtained by light optical microscopy (LOM), where austenitic grains with twins without eventually any martensite traces are observed. In the micrograph, the dark phase indicated by white arrows represents the elongated delta ferrite, which was verified in the rolling direction (RD) 31,32 . Because of the greater Cr eq /Ni eq ratio and plate thickness, the ASS 304L was more susceptible to have delta ferrite than the ASS 201LN.…”

Section: Resultsmentioning

confidence: 80%

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

et al. 2022

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This work evaluates microstructural changes and residual stresses on surface samples of AISI 201LN and 304L subjected to shot peening. The residual stresses were measured by Xray diffraction and magnetic Barkhausen noise (MBN) in different shot-peened conditions. The results showed that the 201LN steel presented more martensite than the 304L steel in the initial condition, but with lower δferrite contents. These ferromagnetic phases were present in a low amount with high tensile residual stresses due to brush cleaning and light coldrolling in the final stage of the fabrication process. The shot peening process promoted compressive residual stresses mainly in the δferrite. However, some "fresh" martensite exhibited tensile residual stress represented by higher and thinner peaks, which together with the low-intensity amplitude in the neighborhood, represented all formed martensite. Thus, small microstructural changes provoked high residual stresses behavior, which can be detected in ferromagnetic phases by MBN.

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Section: Resultsmentioning

confidence: 80%

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

et al. 2022

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“…Elements Mo and W improve passivity and resistance to destruction in the initial stages of local corrosion of chromium-nickel steels [20]. The formation of δ-ferrite does not impair or prevent corrosion tolerance of the steel AISI 304 [21]. Doping the alloy FeCrMnMoNC with Mo increases the tolerance of pitting corrosion [22].…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

“…Our review of literary data [10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] reveals that there are unresolved issues that are associated with the influence of each element in the smelting cycles of one steel grade on the rate of pitting corrosion in the presence of all other components of austenitic chromium-nickel steels. Additionally, the role of combined elements consistently added to each other has not been studied for corrosion.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

Determining the role of individual and combined chemical elements in the pitting corrosion process of austenitic Fe-Cr-Ni steels

Snіzhnoі

Сніжной

Stepanenko

2022

EEJET

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This paper reports a study into the role of individual (S, P, N, C, Si, Mn, Ni, Cr) and combined (Q1=S, Q2=S+P, Q3=S+P+N, Q4=S+P+N+C, Q5=S+P+N+C+Si, Q6=S+P+N+C+Si+Mn, Q7=S+P+N+C+Si+Mn+Ni, Q8=Q=S+P+N+C+Si+ Mn+Ni+Cr) elements in five steel AISI 304 smelting cycles. The correlation between the rate of corrosion K in chloride-containing media and the specific magnetic susceptibility c0 of austenite (matrix), the low content Рdof d-ferrite, and the percentage of elements has been established. Taking into consideration the order of arrangement and influence of other present components, a set of the different-shaped graphic models of K dependences on c0, Рd, and percentage of elements was found. However, the sum of the eight calculated individual and combined elements (Q8) of the models coincides with the sum of the same elements (Q=Q8) of steel smelting samples that were subjected to experimental measurements of c0 and Рd. The curves of the reported models were compared with experimental dependences of K on c0, Рd. The positive and negative role of individual and combined elements in the process of pitting resistance of steel smelting cycles has been identified. Given this, it is assumed that the effect exerted on K by individual and combined elements in the intervals before and after their critical content may be ambiguous. Hence, one value K can correspond to several values of the contents of elements, c0, Рd. A proof of that is the coincidence between the calculated models K of corrosion on the same total content of Q8 for steel samples determined experimentally. The positive (negative) and ambiguous role of elements in the process of corrosion and the possibility of predicting corrosion tolerance of austenitic steels are assumed. The experimental dependence K on c0 and Рd has been established; the greater c0 and Рd, the lower the corrosion rate K. The studied steels contained d-ferrite in the low limits of 0.01...0.1 %.

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“…The effects of the delta ferrite on the corrosion resistance of the austenitic stainless steels are not yet clearly understood. However, the effect of the delta ferrite on corrosion resistance of the austenitic stainless steel is usually explained by the formation of Cr depleted zone, low concentrations of Cr and Mo in the austenite phase, precipitation of a sigma phase, and segregation of sulfur or phosphorus along with the δ/γ interface [3][4][5][6]. The microstructure of austenitic stainless steel is monophasic ie.…”

Section: Introductionmentioning

confidence: 99%

Influence of Sigma Phase on General Corrosion of Austenitic Stainless Steel

Hodžić

Kasapović

Gigović-Gekić

et al. 2022

JST&M

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Austenitic stainless steel is mostly used at high temperatures. It is known that during heating of the austenitic stainless steel with increasing temperature and time of annealing a microstructure is changed i.e. there is the precipitation of carbides followed by precipitation of secondary phases as a sigma phase. The presence of the delta ferrite in austenitic stainless steel enhances the formation of the sigma phase. This study represents the influence of delta ferrite on the sigma phase formation and the effect of the sigma phase on general corrosion. Corrosion tests were conducted in the corrosion cell according to Standard ASTM G5, on instrument potentiostat/galvanostat, Princeton Applied Research, model 263A-2, with the software PowerCORR® (Standard, ASTM G5-94). Examinations were carried out in 1% HCl and 10% FeCl3 solutions. The Tafel extrapolation method was used for the investigation of general corrosion. The results of corrosion testing indicated that the intensity of the general corrosion increases with the increase of the delta ferrite and sigma phase contents.

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Influence of delta ferrite on corrosion susceptibility of AISI 304 austenitic stainless steel

Cited by 12 publications

References 5 publications

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

Effect of Shot Peening Treatment on Residual Stress and Magnetic Barkhausen Noise of AISI 201LN and AISI 304L Stainless Steels

Determining the role of individual and combined chemical elements in the pitting corrosion process of austenitic Fe-Cr-Ni steels

Influence of Sigma Phase on General Corrosion of Austenitic Stainless Steel

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