The effect of stress and temperature on the extent of primary creep in directionally solidified nickel-base superalloys

1971 ◽  
Vol 2 (3) ◽  
pp. 907-908 ◽  
Author(s):  
G. R. Leverant ◽  
D. N. Duhl
Keyword(s):  
Primary Creep ◽  
Directionally Solidified ◽  
Nickel Base Superalloys ◽  
Nickel Base

scholarly journals Back-Stress and Its Evolution during Primary Creep in Particle Strengthened Nickel Superalloys

Crystals ◽  
2020 ◽  
Vol 10 (4) ◽  
pp. 306 ◽  
Author(s):  
Sanket Sarkar ◽  
Yan Gao ◽  
Shenyan Huang ◽  
Saswata Bhattacharya ◽  
Swapnil Patil ◽  
...  
Keyword(s):  
Neutron Diffraction ◽  
Metallic Matrix ◽  
Back Stress ◽  
Primary Creep ◽  
Internal Stresses ◽  
Nickel Superalloys ◽  
Directionally Solidified ◽  
Prior Deformation ◽  
Nickel Base

According to Eshelby’s theory, inelastically inhomogeneous inclusions in a metallic matrix give rise to a distribution of internal stresses. In the case of particle strengthened materials, such as nickel base superalloys, the presence and evolution of this back-stress leads to various observable effects, such as primary creep, back-flow upon loading, and memory of prior deformation. This article presents the background of the concept of back-stress and how it applies to the scenario of creep. A derivation of an evolution equation for back-stress in the context of primary creep is also presented. The results from neutron diffraction with in-situ creep experiments on directionally solidified nickel superalloys are presented in order to demonstrate the validity of the proposed equation and the corollaries derived therefrom.

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