On the role of Re in the stress and temperature dependence of creep of Ni-base single crystal superalloys

Wollgramm, P.; Buck, Hinrich; Neuking, K.; Parsa, Alireza B.; Schuwalow, Sergej; Rogal, Jutta; Drautz, Ralf; Eggeler, Gunther

doi:10.1016/j.msea.2015.01.010

Cited by 80 publications

(23 citation statements)

References 43 publications

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“…The slopes of the lines that limit the gray scatter fields in Figures 6(c) and (d) correspond to n and Q app values of 6 and 500 kJ/mole, respectively. These values lie inside the range of literature data which have recently been reviewed by Wollgramm et al [51] The first research period of shear [22,26] (b) Glide and climb movement of an ordinary a 0 /2 h110i{111} dislocation in c-channels along a c/c¢-interface. [26] (c) h100i dislocations in the c¢-phase formed from two ordinary c-channel dislocations (with different Burgers vectors) which move in a combined motion of glide and climb.…”

Section: High-temperature and Low-stress Shear Creep Datasupporting

confidence: 72%

On Shear Testing of Single Crystal Ni-Base Superalloys

Eggeler

Wieczorek

Fox

et al. 2018

Metall Mater Trans A

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Shear testing can contribute to a better understanding of the plastic deformation of Ni-base superalloy single crystals. In the present study, shear testing is discussed with special emphasis placed on its strengths and weaknesses. Key mechanical and microstructural results which were obtained for the high-temperature (T % 1000°C) and low-stress (s % 200 MPa) creep regime are briefly reviewed. New 3D stereo STEM images of dislocation substructures which form during shear creep deformation in this regime are presented. It is then shown which new aspects need to be considered when performing double shear creep testing at lower temperatures (T < 800°C) and higher stresses (s > 600 MPa). In this creep regime, the macroscopic crystallographic [11À2](111) shear system deforms significantly faster than the [01À1] (111) system. This represents direct mechanical evidence for a new planar fault nucleation scenario, which was recently suggested (Wu et al. in Acta Mater 144:642-655, 2018). The double shear creep specimen geometry inspired a micro-mechanical in-situ shear test specimen. Moreover, the in-situ SEM shear specimen can be FIB micro-machined from prior dendritic and interdendritic regions. Dendritic regions, which have a lower c¢ volume fraction, show a lower critical resolved shear stress.

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Section: High-temperature and Low-stress Shear Creep Datasupporting

confidence: 72%

On Shear Testing of Single Crystal Ni-Base Superalloys

Eggeler

Wieczorek

Fox

et al. 2018

Metall Mater Trans A

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“…A suitable temperature was obtained fastest with a temperature change of 60 o C/min, and diffusion increased with increasing temperature. Temperature dependence of the diffusion creep plastic deformation mechanism has been shown [10,11]; therefore, we propose a possible diffusion creep plastic deformation mechanism for the hot deformation process. We conclude that deformation temperature plays an important role in the formation of c-axis crystal texture during hot deformation.…”

Section: Resultsmentioning

confidence: 81%

Effect of Deformation Temperature on Crystal Texture Formation in Hot Deformed Nanocrystalline SmCo₅Permanent Magnets

Ma¹,

Yue²,

Lv³

et al. 2016

Journal of Magnetics

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In the present study, bulk anisotropic nanocrystalline SmCo 5 magnets were prepared by hot deformation. The effect of deformation temperature on the texture and magnetic properties are presented, based on which the mechanism of plastic deformation and texture formation during the hot deformation process is discussed. Our analyses reveal that deformation temperature is one of the most important parameters that determine the texture of SmCo 5 grains. We suggest that diffusion creep plastic deformation occurs during hot deformation, which is very sensitive to the energy gain provided by an increase in temperature.

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“…[19] All details concerning creep testing have been reported elsewhere. [10,[19][20][21] Uniaxial <100> tensile creep tests were performed in two temperature/stress regimes, 1 050 C/160 MPa and 750 C/800 MPa. Creep tests were performed using specimens with microstructures which formed with and without HIP treatment.…”

Section: Hot Isostatic Pressing and Creep Testingmentioning

confidence: 99%

On the Effect of Hot Isostatic Pressing on the Creep Life of a Single Crystal Superalloys

et al. 2016

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The creep behavior of a single-crystal Ni-base superalloy in two microstructural states is compared. One is obtained by casting followed by a conventional heat treatment. The other results from the same nominal heat treatment integrated into a hot isostatic pressing process. The microstructure after HIP differed from that in the conventional route in two respects. First, the g 0 particles are smaller and the g channels are narrower. Second, after HIP, the number density of pores is lower and the pore sizes are smaller. The HIP microstructure improves creep in two respects: the finer g/g 0 -microstructure results in lower minimum creep rates. Moreover, the shrinkage of cast porosity during HIP delays the nucleation and growth of micro cracks and results in higher rupture strains in the low-temperature high stress regime.

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On the role of Re in the stress and temperature dependence of creep of Ni-base single crystal superalloys

Cited by 80 publications

References 43 publications

On Shear Testing of Single Crystal Ni-Base Superalloys

On Shear Testing of Single Crystal Ni-Base Superalloys

Effect of Deformation Temperature on Crystal Texture Formation in Hot Deformed Nanocrystalline SmCo₅Permanent Magnets

On the Effect of Hot Isostatic Pressing on the Creep Life of a Single Crystal Superalloys

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On the role of Re in the stress and temperature dependence of creep of Ni-base single crystal superalloys

Cited by 80 publications

References 43 publications

On Shear Testing of Single Crystal Ni-Base Superalloys

On Shear Testing of Single Crystal Ni-Base Superalloys

Effect of Deformation Temperature on Crystal Texture Formation in Hot Deformed Nanocrystalline SmCo5Permanent Magnets

On the Effect of Hot Isostatic Pressing on the Creep Life of a Single Crystal Superalloys

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Product

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Effect of Deformation Temperature on Crystal Texture Formation in Hot Deformed Nanocrystalline SmCo₅Permanent Magnets