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

Crystals

Yan Gao¹  Shenyan Huang¹  Ramkumar Oruganti²  Sanket Sarkar²  Swapnil Patil²  Saswata Bhattacharya³ 

[1] GE Research, 1 Research Circle, Niskayuna, NY 12309, USA;GE Research, John F. Welch Technology Centre, EPIP, Whitefield, Bangalore 560066, India;Materials Science & Metallurgical Engineering, IIT Hyderabad, Kandi Sangareddy 502285, India;

关键词: back-stress;    superalloys;    creep;    Eshelby inclusion;    neutron diffraction;   

DOI  :  10.3390/cryst10040306

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown