Effects of long-term thermal aging on bulk and local mechanical behavior of ferritic-austenitic duplex stainless steels

Schwarm, Samuel C.; Mburu, Sarah; Kolli, R. Prakash; Perea, Daniel E.; Ankem, Sreeramamurthy

doi:10.1016/j.msea.2018.02.058

Cited by 27 publications

(6 citation statements)

References 39 publications

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“…The mixed mode of fracture, which consists of flat facets, cleavage, and shallow dimples, depicts lower ductility (~32 %), consistent with earlier observations, Figure 19a [5,7,9,32,50]. Many secondary σ-phases lead to cracks and microvoids due to stress induced by σphase precipitation, which merges to form a greater number of microvoids on the sample surface, [27,50].…”

Section: Fracture Surface and Sub-surfacesupporting

confidence: 87%

“…The presence of σ-phase, caused by the mixed mode of fracture and void nucleation at different interfaces like the fractography of hot rolled, solution treated (1300 °C, 30 minutes), cold rolled (50 %) and aged (950 °C, 20 minutes) specimen, Figure 16a, b. Furthermore, the presence of shallow dimples leads to reduced ductility [5,32]. The higher unrelieved arrested stress after the solution treatment enhances the advancement of the crack motion [2].…”

Section: Fracture Surface and Sub-surfacementioning

confidence: 99%

Section: Fracture Surface and Sub-surfacementioning

confidence: 99%

“…Mixed mode of fracture comprising microfacets and varying dimple sizes having shallow depths and reduced fineness which is indicative of lower ductility (~23 %), Figure 16a [5,9,27,32,50]. The presence of σ-phase caused a mixed fracture mode due to ferrite hardening and embrittlement [7,32]. The void nucleation through austenite/ferrite, austenite/sigma, ferrite/sigma interface, and the triple point of austenite/ferrite/sigma phases was revealed from the sub-surface micrograph, Figure 16b.…”

Section: Fracture Surface and Sub-surfacementioning

confidence: 99%

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Effect of thermal ageing on microstructure, mechanical properties, and fracture behaviour of 50 % cold rolled duplex stainless steel (alloy 2507)

Ghosh

Yadav

2023

Materialwissenschaft Werkst

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The paper deals with cold rolling and ageing on microstructure and mechanical properties of 2507 duplex stainless steel. Microstructure depicts acicular/Widmanstätten austenite and δ‐ferrite with dissimilar volume fraction (∼0.55 for ferrite and ∼0.45 for austenite). Cold rolling and ageing at 950 °C, 1000 °C and 1050 °C result in equiaxed austenite for samples solution treated at 1040 °C and elongated at 1300 °C. By lowering ageing temperature from 1050 °C to 950 °C, structure becomes finer from ∼20 μm to <10 μm grain size. The sigma (σ) phase appears after ageing at 950 °C. Micro‐hardness reveals maximum hardness for the hot rolled, solutionized (1040 °C) water quenched, and cold rolled (50 %) sample (380 HVδF 100 and 430 HVγ 100), whereas the tensile results reveal the hot rolled, solution treated (1300 °C, 1040 °C), cold rolled and aged at 950 °C samples show higher strength (yield strength=625 MPa, 567 MPa and ultimate tensile strength=892 MPa, 826 MPa) and lower ductility (23 %, 32 %) due to the σ‐phase. The solution treated (1040 °C), cold rolled, aged at 1050 °C sample exhibits attractive strength and ductility combination (∼30 GPa %). Fractography supports the tensile results.

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Section: Fracture Surface and Sub-surfacesupporting

confidence: 87%

Section: Fracture Surface and Sub-surfacementioning

confidence: 99%

Section: Fracture Surface and Sub-surfacementioning

confidence: 99%

Section: Fracture Surface and Sub-surfacementioning

confidence: 99%

See 2 more Smart Citations

Effect of thermal ageing on microstructure, mechanical properties, and fracture behaviour of 50 % cold rolled duplex stainless steel (alloy 2507)

Ghosh

Yadav

2023

Materialwissenschaft Werkst

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“…Besides hydrogen embrittlement, aging DSS at 475 °C can be deleterious for their ductility and can even embrittle the steel. Most of the studies [7][8][9] have investigated the embrittlement of DSS after a long aging time. It affects the ferrite phase which decomposes into Fe-rich ' and Cr-rich '' at 475  C by a spinodal decomposition.…”

Section: Introductionmentioning

confidence: 99%

Effect of hydrogen and thermal aging on plastic deformation of a duplex stainless steel

Bchara

Serre

Vogt

2022

METAL 2022 Conference Proeedings

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In this paper, the effects of hydrogen charging and aging treatment on the cyclic plasticity of a S32304 lean duplex steel were investigated. The surface modifications were analyzed using atomic force microscopy and scanning electron microscopy. The slip morphologies of annealed, hydrogenated or thermally aged specimens were compared after cyclic loading at p= 0.07%. Significant changes were detected for austenite charged with hydrogen and for ferrite thermally aged. The results indicated a planar slip mode with a secondary slip for hydrogenated austenite. The height and the spacing between the slip marks of austenite (SBH and SBS) decreased from nm to [8-2] nm and from [3-0.7] m to [1-0.2] m respectively with hydrogen addition. The morphology and the mean value of SBH and SBS of ferrite slip lines remained the same after 5 h of hydrogen charging. However, the increase of hydrogen charging duration created micro-cracks inside the slip bands of ferrite and decreased the value of their SBH and SBS. The thermally aged steel developed straight slip bands inside the ferrite after cyclic loading while they were curvilinear in the annealed material. The effect of the -phase spinodal decomposition was pointed out even for a short aging duration.

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Comparative study of PVD and CVD cutting tools performance in milling of duplex stainless steel

Martinho

Silva

Martins

et al. 2019

Int J Adv Manuf Technol

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Effects of long-term thermal aging on bulk and local mechanical behavior of ferritic-austenitic duplex stainless steels

Cited by 27 publications

References 39 publications

Effect of thermal ageing on microstructure, mechanical properties, and fracture behaviour of 50 % cold rolled duplex stainless steel (alloy 2507)

Effect of thermal ageing on microstructure, mechanical properties, and fracture behaviour of 50 % cold rolled duplex stainless steel (alloy 2507)

Effect of hydrogen and thermal aging on plastic deformation of a duplex stainless steel

Comparative study of PVD and CVD cutting tools performance in milling of duplex stainless steel

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