Ultra-fast sulphur grain boundary segregation during hot deformation of nickel

Allart, Marion; Christien, Frédéric; Gall, René Le

doi:10.1016/j.actamat.2013.09.035

Cited by 14 publications

(4 citation statements)

References 27 publications

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“…One possible explanation for this is that the transport of the solute is actually strongly accelerated by plastic deformation. This would be consistent with the huge acceleration of sulphur diffusion in nickel during plastic deformation observed by Allart et al [19]. Those authors showed that the transport of sulphur in nickel in the 450-550 °C temperature range was strongly correlated to plastic deformation and was faster, by four to five orders of magnitude, than normal bulk diffusion.…”

Section: Resultssupporting

confidence: 89%

Role of Impurity Sulphur in the Ductility Trough of Austenitic Iron–Nickel Alloys

Christien

2020

Materials

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The role of impurity sulphur in the ductility trough of iron–nickel (Fe–Ni) alloys is investigated using hot tensile tests. A strong detrimental effect of some ppm levels of sulphur is demonstrated. In addition, it is shown that, in the ductility trough, material failure occurs through subcritical grain boundary crack propagation, involving dynamic embrittlement at the crack tip, due to the sulphur. Very high intergranular crack growth rates are observed. This is possible because plastic deformation accelerates the transport of sulphur to the crack tip, by several orders of magnitude, compared to normal bulk diffusion. The ductility is recovered at high strain rates, which correlates with a decrease in the sulphur concentration measured on the fracture surface. It is suggested that the main mechanism of sulphur transport is dragging by moving dislocations.

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Section: Resultssupporting

confidence: 89%

Role of Impurity Sulphur in the Ductility Trough of Austenitic Iron–Nickel Alloys

Christien

2020

Materials

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“…Maximum embrittlement in the elevated temperature tension tests which is induced by a maximum in the grain-boundary concentration of sulfur at 500 °C has been found in experimental Ni-Cr-Fe alloy [28] . Sulfur grain boundary segregation during hot deformation at 450 and 500 °C of nickel (before recrystallization) has been also indicated by Allart et al [34] . At low temperatures (< 600 °C), the segregation of alloying elements (such as W, Cr, Mo) does not have enough energy.…”

Section: Mechanical Propertiesmentioning

confidence: 56%

Grain Boundary Segregation and Mechanical Properties of an Aged Ni-20Cr-18W-1Mo Superalloy at Different Temperatures

Yan

Xue

Zhang

et al. 2016

Rare Metal Materials and Engineering

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The influence of aging temperature (200 to 800 °C) on grain boundary segregations in a Ni-20Cr-18W-1Mo superalloy was investigated by scanning electronic microscope (SEM), transmission electron microscopy (TEM), electron microprobe analyzer (EMPA) and a mechanical testing machine. Results indicate that the grain boundary segregation critical time of sulfur and phosphorus decreases with increasing of the aging temperature. Increasing of the aging temperature has a conspicuous effect on the concentration distribution in the grain boundary and the grain core. Grain boundary concentrations of sulfur and phosphorus increase with raising the testing temperature until a peak value is obtained at 650 and 400 °C, respectively, which is the essential reason to the declined mechanical properties from 200 to 600 °C.

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“…The precipitate size of forming precipitates being constant with strain, and their volume fraction increasing linearly with strain, the mechanism of their formation has to be a continuous nucleation during plastic straining. The role of excess vacancies in microstructure evolutions during plastic straining is actually gaining increasing support in the literature such as shown by a recent report of the segregation kinetics of Sulfur to grain boundaries in Ni alloys [9].…”

Section: Discussionmentioning

confidence: 97%

Dynamic Interactions between Precipitation and Plastic Deformation in Aluminium Alloys

Deschamps

Geuser

Hutchinson

et al. 2014

MSF

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Dynamic interactions between plastic deformation and precipitation processes in Aluminium alloys can lead to large changes in precipitation kinetics as compared to conventional heat treatments. This can be due to a number of different mechanisms such as changes in vacancy concentrations or movement of structural defects. Understanding the underlying mechanisms requires a quantitative measurement of the precipitate evolution as a function of deformation conditions, temperature and time. The present contribution will review experimental results obtained by Small-Angle X-ray Scattering in three different configurations, all concerning Al-Zn-Mg-Cu alloys: first, dynamic precipitate evolution during plastic deformation at ageing temperature; second, dynamic precipitation during low cycle fatigue at room temperature; and third, precipitation during ageing of a material processed by room temperature high pressure torsion. The experimental evidence will be used to discuss the role of the different mechanisms of interaction with plasticity on the precipitate microstructure evolution.

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Ultra-fast sulphur grain boundary segregation during hot deformation of nickel

Cited by 14 publications

References 27 publications

Role of Impurity Sulphur in the Ductility Trough of Austenitic Iron–Nickel Alloys

Role of Impurity Sulphur in the Ductility Trough of Austenitic Iron–Nickel Alloys

Grain Boundary Segregation and Mechanical Properties of an Aged Ni-20Cr-18W-1Mo Superalloy at Different Temperatures

Dynamic Interactions between Precipitation and Plastic Deformation in Aluminium Alloys

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