Influence of niobium solutes on the mechanical behavior of nickel during hot working

Matougui, N.; Piot, David; Fares, Mohamed Lamine; Montheillet, F.; Semiatin, S. L.

doi:10.1016/j.msea.2013.07.079

Cited by 17 publications

(31 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To deal with a numerical example, data pertaining to a model Nickel-1% Niobium alloy deformed at 900 °C and 0.01

will be used [ 20 , 22 ]:

(with

. Measurements have shown that

, but r will be varied here between 0 and 10 to assess the influence of dynamic recovery, a range that is typical for materials undergoing DDRX.…”

Section: Derivation Of the Steady State Flow Stress And Grain Sizementioning

confidence: 99%

See 1 more Smart Citation

Influence of Boundary Migration Induced Softening on the Steady State of Discontinuous Dynamic Recrystallization

Montheillet

2021

Materials

View full text Add to dashboard Cite

During discontinuous dynamic recrystallization (DDRX), new dislocation-free grains progressively replace the initially strain-hardened grains. Furthermore, the grain boundary migration associated with dislocation elimination partially opposes strain hardening, thus adding up to dynamic recovery. This effect, referred to as boundary migration induced softening (BMIS) is generally not accounted for by DDRX models, in particular by “mean-field” approaches. In this paper, BMIS is first defined and then analyzed in detail. The basic equations of a grain scale DDRX model, involving the classical Yoshie–Laasraoui–Jonas equation for strain hardening and dynamic recovery and including BMIS are described. A steady state condition equation is then used to derive the average dislocation density and the average grain size. It is then possible to assess the respective influences of BMIS and dynamic recovery on the strain rate sensitivity, the apparent activation energy, and the relationship between flow stress and average grain size (“Derby exponent”) of the material during steady state DDRX. Finally, the possible influence of BMIS on the estimation of grain boundary mobility and nucleation rate from experimental data is addressed.

show abstract

“…To deal with a numerical example, data pertaining to a model Nickel-1% Niobium alloy deformed at 900 °C and 0.01

will be used [ 20 , 22 ]:

(with

. Measurements have shown that

, but r will be varied here between 0 and 10 to assess the influence of dynamic recovery, a range that is typical for materials undergoing DDRX.…”

Section: Derivation Of the Steady State Flow Stress And Grain Sizementioning

confidence: 99%

“…Stress–strain curves at various strain rates and temperatures allow h and r to be readily derived, and it has been observed that

remains approximately constant in low stacking fault energy materials like austenitic stainless steels or Ni-Nb alloys [ 22 ], while h takes the form (Equation (19)):

…”

Section: Constitutive Parametersmentioning

confidence: 99%

Influence of Boundary Migration Induced Softening on the Steady State of Discontinuous Dynamic Recrystallization

Montheillet

2021

Materials

View full text Add to dashboard Cite

show abstract

“…Simple strain rate, temperature, and solute concentration dependences are now assigned to the mesoscale model parameters. On the basis of experimental data from Ni-Nb alloys [18] and austenitic stainless steels [19], and for the sake of simplicity, the two exponents p and ν are considered as constants. The hardening parameter H is assumed to depend on strain rate and temperature according to a power law and an inverse Arrhenius equation, respectively, in the same way as a flow stress.…”

Section: Dependence Of the Model Parameters On ε T And Cmentioning

confidence: 99%

“…where the minus sign has been introduced to get ξ > 0 accounting for the fact that DS decreases with increasing C. In Equations (17) and (18), the first and second terms in the brackets are associated with the influence of C on strain hardening and grain boundary mobility, respectively. Since p > 1, ξ > ξ, which implies that, with the above definitions, DS is more sensitive than σS to the solute content.…”

Section: Effects Of Strain Rate Temperature and Solute Concentratiomentioning

confidence: 99%

“…The above results are now illustrated with experimental data pertaining to a series of high purity base Ni-Nb alloys including high purity nickel, Ni-0.01%Nb, Ni-0.1%Nb, and Ni-1%Nb. They were obtained from hot torsion tests carried out at 800, 900, and 1000 • C and 0.1 s −1 up to the steady state flow stress (ε = 5) [18]. The average grain sizes were measured by optical microscopy (OM) and in some cases by Electron Backscattering Diffraction (EBSD) in order to plot a ln D s − ln σ s "Derby diagram".…”

Section: Application To a Set Of Ni-nb Alloysmentioning

confidence: 99%

See 1 more Smart Citation

Some Facts We Can Learn from Analytical Modeling of DDRX in Pure Metals and Solid Solutions

Montheillet

2018

Metals

View full text Add to dashboard Cite

Modeling and simulation of discontinuous dynamic recrystallization (DDRX) are now commonly carried out by numerical methods, most often finite element computation. It is also possible to use simple analytical approaches on the grain scale to get relevant information about the basic mechanisms involved in DDRX, in particular regarding the large strain steady state behaviour. This is illustrated in the present paper on the basis of a model previously proposed by the author and co-workers, which is first briefly presented. The macroscopic constitutive parameters associated with DDRX are then derived and three distinct “Derby exponents” are introduced for describing the relationship between steady state grain size and flow stress. Finally, it is shown, with the example of grain sizes, that not only can average quantities be predicted analytically, but also their distributions.

show abstract

Hot Deformation and Recrystallization Mechanisms in a Coarse-Grained, Niobium Stabilized Austenitic Stainless Steel (316Nb)

Hermant

Suzon

Petit³

et al. 2019

Metall Mater Trans A

View full text Add to dashboard Cite

Influence of niobium solutes on the mechanical behavior of nickel during hot working

Cited by 17 publications

References 24 publications

Influence of Boundary Migration Induced Softening on the Steady State of Discontinuous Dynamic Recrystallization

Influence of Boundary Migration Induced Softening on the Steady State of Discontinuous Dynamic Recrystallization

Some Facts We Can Learn from Analytical Modeling of DDRX in Pure Metals and Solid Solutions

Hot Deformation and Recrystallization Mechanisms in a Coarse-Grained, Niobium Stabilized Austenitic Stainless Steel (316Nb)

Contact Info

Product

Resources

About