Stainless Steels

Truman, J. E.

doi:10.1002/9783527603978.mst0072

Cited by 4 publications

(3 citation statements)

References 10 publications

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“…Indeed, a yellow (the color of WO 3 [33]) reflection was seen on UNS S39274 after the tests. Even though W is a ferrite stabilizer [38], ferrite dissolved selectively for UNS S39274, as seen in Figure 7. The dissolved W, in the form of tungstate ions, can precipitate forming a WO 3 layer, shown to reduce the corrosion rate [39].…”

Section: Role Of W In Crevice-like-solutionsmentioning

confidence: 99%

Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels

Torres

Iannuzzi

Johnsen

2020

Metals

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Two super duplex stainless steels (SDSS) with different W content, namely UNS S32750 (W-free) and UNS S39274 (2.1 wt.% W), were tested in simulated crevice corrosion environments to determine the influence of W on their corrosion resistance. Anodic potentiodynamic polarization experiments were performed in two different crevice-like-solutions: 1 M HCl (as reference for a pH = 0 environment), and 7 M LiCl, adjusted to the same pH value. Galvele’s critical acidification model was used to estimate the theoretical critical potential (Ecrit) and comparatively evaluate the corrosion resistance of the two SDSS. The anodic potentiodynamic polarization results showed a statistically significant difference between the two materials in only one test condition, i.e., 7 M Cl− at 60 °C. Additionally, the quantification of chemical dissolution of the metal cations after the tests suggested a surface enrichment in W only in the 7 M chloride solution. Scanning electron microscope (SEM) analysis indicated a uniform dissolution experienced by UNS S32750 in this environment, whereas UNS S39274 suffered selective corrosion of the ferrite-phase. These observations were reflected in a slight increase in the Ecrit values of UNS S32974 estimated with Galvele’s model.

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Section: Role Of W In Crevice-like-solutionsmentioning

confidence: 99%

Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels

Torres

Iannuzzi

Johnsen

2020

Metals

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“…Incoloy alloy 800 is an iron-based superalloy that belongs to the type of super austenitic stainless steels. The alloy is derived from the austenitic steel AISI 304 and is used in applications that require strength at high temperatures and corrosion resistance in a variety of corrosive environments [1,2]. It is particularly useful for high-temperature equipment in the petrochemical industry because the alloy is not susceptible to sigmaphase embrittlement after long time exposure at 650°C.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and stability conditions for hot deformation of a modified iron-based superalloy

Carsí¹,

Llaneza²,

Ruano³

2019

Materials Science and Technology

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A modified iron-based superalloy is studied regarding its hot formability. The microstructure contained particles of titanium carbides, carbonitrides and nitrates. Torsion tests at high strain rate at temperatures ranging from 800 to 1200°C were conducted. Results of these tests were correlated by means of the Garofalo hyperbolic sine creep relation. An optimum forming temperature of 1260°C at 10 s−1 is obtained. This temperature is strongly dependent on the strain rate. An activation energy for plastic deformation close to that for the activation energy for lattice diffusion in austenitic stainless steels and a stress exponent near 5 were obtained. These values suggest that plastic deformation is controlled by a dislocation climb mechanism.

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“…As a functional and modern structural material, the single-phase austenitic stainless steel (AISI 316L) has played an important role in engineering field because of its high work hardening, excellent resistance to corrosion and oxidation, and good formability over a wide range of temperature [1][2][3]. Many scholars have done research on it.…”

Section: Introductionmentioning

confidence: 99%

A quantitative understanding on deformation twins generation in single-phase austenitic stainless steels

Shi

Zhou

2019

Materials Science and Technology

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Single-phase austenitic stainless steels (316L) have attracted widespread attention from scientists because of their duplex microstructure. In this paper, to have a quantitative understanding on the microstructure deformation of 316L, a physical model based on dislocation theory and strain gradient theory is established to find out the critical conditions when deformation twins generate. The twinning stress and the stress caused by strain gradients are two factors affecting the deformation twinning process. Numerical simulation results reveal that the twinning stress decreases with the increase of twin spacing and the decreases of volume fraction of twins and the orientation of external shear stress; the stress caused by strain gradients increases with the decrease of matrix grain size.

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Stainless Steels

Cited by 4 publications

References 10 publications

Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels

Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels

Microstructure and stability conditions for hot deformation of a modified iron-based superalloy

A quantitative understanding on deformation twins generation in single-phase austenitic stainless steels

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