Mechanical properties and corrosion resistance of ultrafine grained austenitic stainless steel processed by hydrostatic extrusion

Krawczyńska, Agnieszka; Chromiński, Witold; Ura‐Bińczyk, Ewa; Kulczyk, Mariusz; Lewandowska, M.

doi:10.1016/j.matdes.2017.09.050

Cited by 40 publications

(11 citation statements)

References 54 publications

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“…In fcc metals after deformation, one usually observes the occurrence of the cube ({001}<100>) texture. The orientation <100> prevails in the as‐received material . However, in this study in a HPT_0.1 MPa sample the orientation <111> dominates.…”

Section: Discussionmentioning

confidence: 50%

Phenomena Occurring in Nanostructured Stainless Steel 316LVM during Annealing under High Hydrostatic Pressure

et al. 2018

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The aim of the study is to demonstrate the impact of high hydrostatic pressure annealing on the grain boundary character, precipitation rate, and susceptibility to intergranular corrosion of nanostructured austenitic stainless steel 316LVM. To this end, samples of an austenitic stainless steel are deformed by high pressure torsion and subsequently annealed at 900 C for 10 min under a pressure of 2, 6 GPa and, for comparison, under atmospheric pressure. The resulting microstructures are examined using electron beam scattering diffraction, and transmission and scanning electron microscopy. It is shown that the pressure applied during annealing leads to a higher percentage of high-angle grain boundaries than does atmospheric pressure. Moreover, it promotes the coexistence of two orientations, <111> and <100>, whereas atmospheric supports mainly <111>. High pressure hinders the growth of carbides, but drastically increases their number compared with atmospheric pressure annealing. As a consequence, the highest number of Cr 23 C 6 carbides are present in the sample annealed under 6 GPa, making this sample susceptible to intergranular corrosion.

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Section: Discussionmentioning

confidence: 50%

Phenomena Occurring in Nanostructured Stainless Steel 316LVM during Annealing under High Hydrostatic Pressure

et al. 2018

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“…It can be thus concluded that the samples differ significantly in terms of their grain boundaries, that is, twin boundaries (TB) are dominant in the RT_HE sample, while low‐angle grain boundaries (LAGB) and high‐angle grain boundaries (HAGB) are characteristic for the HOT_HE and annealed samples, respectively. A detailed analysis of microstructures in the austenitic stainless steel 316LVM produced by HE at RT and elevated temperature can be found elsewhere …”

Section: Resultsmentioning

confidence: 99%

Formation of the Nitrided Layers on an Austenitic Stainless Steel with Different Grain Structures

et al. 2018

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In this work, the formation of nitrided layers on an austenitic stainless steel with very different grain structures is analyzed. Two different grain structures, that is, 1) nanotwined and 2) consisted of dislocation low-angle grain boundaries are produced by hydrostatic extrusion either hot (with preheating at 1000 C) or room temperature with a total true strain of 1.4. The coarsegrained sample is used as a reference one. These three types of samples are nitrided using low-temperature plasma-assisted nitriding at 430 C for 5 h. Nitrided layers consisting of S-phase are produced on all the samples. However, only minor differences in their thickness are observed. The analysis reveals that the formation of nitrided layers is controlled by volume diffusion disregarding the grain structure of the substrates. This is attributed to very specific grain boundaries (twin and dislocation grain boundaries) dominating in hydrostatically extruded samples. Such special grain boundaries do not provide fast diffusion channel but act as trapping sites for diffusing atoms. As a consequence, much more nitrogen is stored in the layers formed on the samples previously subjected to hydrostatic extrusion but the layer thickness does not differ significantly.

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“…For alloying elements design, chromium and molybdenum are usually added into steel substrate to improve corrosion resistance. Chromium owns low metal‐metal bond strength and high metal‐oxygen bond strength, which promotes the early formation of Cr‐rich compounds and Cr 2 O 3 b and Figure b).…”

Section: Discussionmentioning

confidence: 99%

Corrosion mechanism of low‐alloy steel used for flexible pipe in vapor‐saturated H₂S/CO₂ and H₂S/CO₂‐saturated brine conditions

Liu

Gao

et al. 2018

Materials & Corrosion

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Immersion experiment was used to elucidate the corrosion mechanism of low‐alloy pipeline steel exposed to vapor‐saturated H2S/CO2 and H2S/CO2‐saturated brine conditions in terms of microstructure, corrosion kinetics, corrosion products, surface/cross‐sectional morphology, and elemental distribution. The experimental results demonstrate that the microstructure of designed steel is tempered martensite, and the corrosion rate in H2S/CO2‐saturated brine condition is larger than that in vapor‐saturated H2S/CO2 condition. The main corrosion product in two corrosion conditions is FeS, which shows various crystal structures. The size of corrosion products formed in vapor‐saturated H2S/CO2 condition is smaller than that of corrosion products formed in H2S/CO2‐saturated brine condition, which contributes to the difference of water chemistry in two corrosion conditions. Cr‐rich compounds are primarily formed on the coupons surface of two corrosion conditions. The schematic models of corrosion mechanism in vapor‐saturated H2S/CO2 condition and H2S/CO2‐saturated brine condition are proposed based on experimental results.

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Mechanical properties and corrosion resistance of ultrafine grained austenitic stainless steel processed by hydrostatic extrusion

Cited by 40 publications

References 54 publications

Phenomena Occurring in Nanostructured Stainless Steel 316LVM during Annealing under High Hydrostatic Pressure

Phenomena Occurring in Nanostructured Stainless Steel 316LVM during Annealing under High Hydrostatic Pressure

Formation of the Nitrided Layers on an Austenitic Stainless Steel with Different Grain Structures

Corrosion mechanism of low‐alloy steel used for flexible pipe in vapor‐saturated H₂S/CO₂ and H₂S/CO₂‐saturated brine conditions

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Mechanical properties and corrosion resistance of ultrafine grained austenitic stainless steel processed by hydrostatic extrusion

Cited by 40 publications

References 54 publications

Phenomena Occurring in Nanostructured Stainless Steel 316LVM during Annealing under High Hydrostatic Pressure

Phenomena Occurring in Nanostructured Stainless Steel 316LVM during Annealing under High Hydrostatic Pressure

Formation of the Nitrided Layers on an Austenitic Stainless Steel with Different Grain Structures

Corrosion mechanism of low‐alloy steel used for flexible pipe in vapor‐saturated H2S/CO2 and H2S/CO2‐saturated brine conditions

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Corrosion mechanism of low‐alloy steel used for flexible pipe in vapor‐saturated H₂S/CO₂ and H₂S/CO₂‐saturated brine conditions