Influence of oversized elements (Hf, Zr, Ti and Nb) on the thermal stability of vacancies in type 316L stainless steels

Yabuuchi, Youichi; Maekawa, M.; Kawasuso, A.

doi:10.1016/j.jnucmat.2012.07.005

Cited by 29 publications

(11 citation statements)

References 30 publications

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“…Yabuuchi etal. [133] investigated the influence of oversized elements on the thermal stability of vacancies in type 316L stainless steels using positron annihilation spectroscopy. They found that vacancies in "pure" 316L stainless steels were mobile at 300 °C but were immobilized by doping of Zr, Ti, Nb or Hf.…”

Section: Effect Of Oversized Solute Atoms On Rismentioning

confidence: 99%

Radiation-induced solute segregation in metallic alloys

Ardell

Bellon

2016

Current Opinion in Solid State and Materials Science

113

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The subject of radiation-induced solute segregation (RIS) in metallic alloys is reviewed. RIS manifests itself in several different ways, including diffusion to point-defect sinks (dislocations, grain boundaries, voids, etc.), which can induce precipitation in undersaturated alloys, as well as self-organization of solute clusters and precipitation in defect-free material.Diffusion in dilute and concentrated alloys is highlighted, as are theories of RIS that include new ideas on diffusion of complexes involving coupling between fluxes of point defects and of solute atoms. Many important experimental observations are presented, including up-to-date findings using atom-probe tomography, with special emphasis on solute segregation in austenitic and ferritic steels. Results from computational modeling and theory are also presented and discussed in light of experimental findings. Examples illustrating the factors affecting RIS are shown and some important outstanding issues that impact the current understanding of RIS are described and discussed.

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Section: Effect Of Oversized Solute Atoms On Rismentioning

confidence: 99%

Radiation-induced solute segregation in metallic alloys

Ardell

Bellon

2016

Current Opinion in Solid State and Materials Science

113

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“…Under these environments, Cr-carbides and Cr-carbontrides precipitate at the grain boundaries, which results in the formation of the Cr-depleted zone [5][6][7]. To overcome this drawback, strong carbide-forming elements are added to reduce the concentration of C, aiming to suppress the Cr-carbides and Cr-carbontrides and avoid the formation of Cr-depleted zone [3,8,9]. It should be noted the addition of carbide-forming elements not only influences the precipitation processes, but also changes the elastic properties of the iron matrix.…”

Section: Introductionmentioning

confidence: 99%

“…These authors revealed a very interesting trend that relatively high values of G correspond to relatively low values of B, and vice versa. For example, FeCr 20 Ni 8 (corresponding approximately to alloy steel AISI 304) has an intermediate value of G (77.3 GPa) but a low value of B (165.2 GPa) [10].…”

Section: Introductionmentioning

confidence: 99%

Elastic Properties of FeCr20Ni8Xn (X = Mo, Nb, Ta, Ti, V, W and Zr) Austenitic Stainless Steels: A First Principles Study

Dou

Luo

2019

Metals

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Austenitic stainless steels suffer from intergranular corrosion and stress corrosion cracking when exposed to elevated temperature (500-800 • C). Under these environments, Cr-carbides and Cr-carbontrides precipitate at the grain boundaries, which results in the formation of Cr-depleted zone. In practice, alloying elements could be added into austenitic stainless steels to modify the precipitation processes. Besides the precipitation processes, the elastic properties of the iron matrix would be influenced. Using the exact muffin-tin orbitals (EMTO) method, the solute effects on the elastic properties of FeCr 20 Ni 8 austenitic stainless steels were studied. Based on the simulated shear modulus (G) and bulk modulus (B), we proposed a design map for FeCr 20 Ni 8 based alloys, aiming to provide a basis for the design of high-performance austenitic stainless steels.It should be noted that a lower value of B means the atomic bond is weaker. Consequently, materials with a low value of B exhibit relatively poor resistance to various forms of localized corrosion (such as intergranular corrosion, pitting corrosion and stress-corrosion cracking) [10,[12][13][14]. Furthermore, Clerc et al. have demonstrated the hardness of the annealed metal is proportional to G [15]. It is commonly known that high a value of the B/G ratio (>1.75) often results in ductility, while a low value of the B/G ratio (<1.75) often results in brittleness [10,11,14,[16][17][18].Potentially, alloying elements (such as Mo, Nb, Ta, Ti, V, W and Zr) might be added into austenitic stainless steels to suppress the Cr-carbides and Cr-carbontrides. In addition to the precipitation processes, the elastic properties of the iron matrix would also be influenced. In this work, we simulated the solute effects on the elastic properties of FeCr 20 Ni 8 austenitic stainless steels. We also calculated the difference (E BCC -E FCC ) between body-centered cubic (BCC) and face-centered cubic (FCC) structure. The solute concentrations considered in this work are 1 at.% and 2 at.%.

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“…On the other hand, the addition of zirconium to a ferritic matrix could effectively translate in better performance of Al–alloyed ODS steels against high temperature and corrosion. This is because the binding energy of Y–Zr oxides in an iron matrix is higher than that of Y–Al oxides, thus Y–Zr oxides are easier to form and more stable than Y–Al oxide particles . For this reason, it is expected that the addition of zirconium to the matrix prevents the oxygen to combine with aluminum, refining the oxide particles and increasing their number density.…”

Section: Introductionmentioning

confidence: 99%

“…This is because the binding energy of Y-Zr oxides in an iron matrix is higher than that of Y-Al oxides, thus Y-Zr oxides are easier to form and more stable than Y-Al oxide particles. 6,7 For this reason, it is expected that the addition of zirconium to the matrix prevents the oxygen to combine with aluminum, refining the oxide particles and increasing their number density. These changes in the size and density of the oxides will ultimately lead to an improvement of the high-temperature strength, while keeping the high corrosion resistance of Al-alloyed ODS steels.…”

Section: Introductionmentioning

confidence: 99%

Effect of Zirconium on the Microstructure and Mechanical Properties of an Al‐Alloyed ODS Steel Consolidated by FAHP

et al. 2015

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An oxide dispersion strengthened (ODS) ferritic steel with nominal composition Fe-14Cr-5Al-3W-0.4Ti-0.25Y 2 O 3 -0.6ZrO 2 was produced by mechanical alloying (MA), based on a prealloyed grade Fe-14Cr-5Al-3W steel with the addition of Ti element, Y 2 O 3 and ZrO 2 , and subsequent consolidation by means of field assisted hot pressing (FAHP). The microstructure and the mechanical properties were analyzed and compared with a reference material with nominal composition Fe-14Cr-5Al-3W-0.4Ti-0.25Y 2 O 3 . The addition of zirconia increased the volume fraction of the smallest and equiaxed ferritic nano-grains and decreased the quantity of larger aluminum nano-oxides within the ferritic matrix, promoting the formation of fine zirconium nano-oxides and leading to the enhancement of the mechanical properties of the alloy.

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Influence of oversized elements (Hf, Zr, Ti and Nb) on the thermal stability of vacancies in type 316L stainless steels

Cited by 29 publications

References 30 publications

Radiation-induced solute segregation in metallic alloys

Radiation-induced solute segregation in metallic alloys

Elastic Properties of FeCr20Ni8Xn (X = Mo, Nb, Ta, Ti, V, W and Zr) Austenitic Stainless Steels: A First Principles Study

Effect of Zirconium on the Microstructure and Mechanical Properties of an Al‐Alloyed ODS Steel Consolidated by FAHP

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