The effect of aging on impact toughness and fracture surface fractal dimension in SAF 2507 super duplex stainless steel

Hilders, O.A.; Zambrano, N.

doi:10.1016/j.jmau.2014.07.001

Cited by 29 publications

(20 citation statements)

References 36 publications

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“…As shown in Figure c cracking proceeded by a localized mixed mode of fracture leading to a partially shear rupture of void coalescence mechanism. Thereupon transgranular quasi‐cleavage facets were connected by shallow and parabolic shape dimples commonly recognized in this kind of mixed mode of fracture . Some regions with reduced size dimples were also observed, which also indicated an embrittlement process…”

Section: Resultsmentioning

confidence: 76%

“…Thereupon transgranular quasi-cleavage facets were connected by shallow and parabolic shape dimples commonly recognized in this kind of mixed mode of fracture. [42] Some regions with reduced size dimples were also observed, which also indicated an embrittlement process. [43] On the contrary, in the exterior region of the fractured samples, typically brittle fracture regions with the riverlike pattern were observed (Figure 9d).…”

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confidence: 99%

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Sulfate‐reducing bacteria‐assisted hydrogen‐induced stress cracking of 2205 duplex stainless steels

Łabanowski

Rzychoń

Simka

et al. 2019

Materials & Corrosion

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The paper presents the results of a laboratory investigation of the microbiologically assisted hydrogen‐induced stress cracking (HISC) of 2,205 duplex stainless steel (DSS). The testing of susceptibility toward HISC was performed with two different methods. Precharged in sulfate‐reducing bacteria (SRB), inoculated medium samples were subjected to slow strain‐rate testing in artificial seawater. In situ constant load tests were performed directly in SRB‐inoculated medium under hydrogen charging at 70% of the ultimate tensile strength. Samples tested in the biotic (SRB) conditions showed a considerable loss of ductility as compared to those tested in sterile conditions. Quantitative characteristics of fracture surfaces indicated increased susceptibility to HISC of biotic samples, therefore, suggesting a role of SRB in promoting hydrogen damage of DSS.

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Section: Resultsmentioning

confidence: 76%

mentioning

confidence: 99%

Sulfate‐reducing bacteria‐assisted hydrogen‐induced stress cracking of 2205 duplex stainless steels

Łabanowski

Rzychoń

Simka

et al. 2019

Materials & Corrosion

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“…It is worth noting that the Cr-rich precipitate produced by spinodal decomposition and the magnetic martensite produced by cold working are usually cited with the same symbol (α') [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24] , but these are phases completely distinct. For this reason, in this paper, the Cr-rich precipitate produced by spinodal decomposition was called α 1 .…”

Section: Methodsmentioning

confidence: 99%

“…Fine α 1 precipitates can cause embrittlement and hardening of ferrite in long term aging [6][7][8][9] . The higher kinetics of reaction (2) occurs at 475 o C and, for this reason, the expressions "475 o C embrittlement" and "475 o C hardening" have been used for ferritic and duplex steels exposed or treated around this temperature.…”

Section: Introductionmentioning

confidence: 99%

Influence of Microstructure on the Corrosion Resistance of AISI 317L (UNS S31703)

et al. 2017

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The AISI 317L stainless steel is an austenitic grade with at least 3%Mo. Recently, this steel has replaced AISI 316L in many applications in chemical and petrochemical industries, due to its higher pitting corrosion resistance. The microstructure of the hot rolled and annealed material studied in this work consists of austenitic grains and 4.0% of delta ferrite (δ) with elongated islands morphology. This microstructure was modified by three processes: cold rolling with 87% of reduction, aging at 450 o C for 400 h, and welding by gas tungsten arc welding (GTAW) process. The corrosion resistance was evaluated by anodic polarization tests (ASTM G-61) and critical pitting temperature tests (ASTM G-150). Cold rolling produced a microstructure consisting of elongated grains of austenite and martensite α', high dislocation density and the elongated islands of delta ferrite present in the annealed material. Welding produced a dendritic microstructure with 7.0% of delta ferrite and some σ precipitated in the ferrite. Finally, the aging at 450 o C for 400 h provoked the decomposition of ferrite. The results show that these microstructural changes affected the pitting corrosion resistance, as detected by ASTM G-61 and ASTM G-150 tests.

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“…[3,4] Super duplex stainless steels (SDSSs) have high contents of Cr, Mo, and Ni and are prone to this type of embrittlement which is why kinetics of phase transformations play a crucial role in processing and applications of these steels. [5] A considerable variation of data reported in the literature and industrial datasheets points to a knowledge gap about the kinetics of 475°C-embrittlement in SDSSs. Hilders et al found that 9 hours heat treatment of 2507 SDSS at 475°C did not decrease the impact toughness while it was significantly reduced after 72 hours.…”

Section: Introductionmentioning

confidence: 99%

Spinodal Decomposition in Functionally Graded Super Duplex Stainless Steel and Weld Metal

Hosseini

Thuvander

Wessman

et al. 2018

Metall Mater Trans A

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Low-temperature phase separations (T < 500°C), resulting in changes in mechanical and corrosion properties, of super duplex stainless steel (SDSS) base and weld metals were investigated for short heat treatment times (0.5 to 600 minutes). A novel heat treatment technique, where a stationary arc produces a steady state temperature gradient for selected times, was employed to fabricate functionally graded materials. Three different initial material conditions including 2507 SDSS, remelted 2507 SDSS, and 2509 SDSS weld metal were investigated. Selective etching of ferrite significantly decreased in regions heat treated at 435°C to 480°C already after 3 minutes due to rapid phase separations. Atom probe tomography results revealed spinodal decomposition of ferrite and precipitation of Cu particles. Microhardness mapping showed that as-welded microstructure and/or higher Ni content accelerated decomposition. The arc heat treatment technique combined with microhardness mapping and electrolytical etching was found to be a successful approach to evaluate kinetics of low-temperature phase separations in SDSS, particularly at its earlier stages. A time-temperature transformation diagram was proposed showing the kinetics of 475°C-embrittlement in 2507 SDSS.

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The effect of aging on impact toughness and fracture surface fractal dimension in SAF 2507 super duplex stainless steel

Cited by 29 publications

References 36 publications

Sulfate‐reducing bacteria‐assisted hydrogen‐induced stress cracking of 2205 duplex stainless steels

Sulfate‐reducing bacteria‐assisted hydrogen‐induced stress cracking of 2205 duplex stainless steels

Influence of Microstructure on the Corrosion Resistance of AISI 317L (UNS S31703)

Spinodal Decomposition in Functionally Graded Super Duplex Stainless Steel and Weld Metal

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