Simulation of rafting type and stress distribution in nickel-based superalloys with different volume fractions of gamma ' phase

作者：Wang, X. M.^*; Cao, M. Y.; Li, S. W.; Deng, C. H.; Yue, Z. F.

来源：Materials at High Temperatures, 2016, 33(3): 248-256.

DOI：10.1080/09603409.2016.1182259

• Rafting
• Creep
• Single-crystal superalloys
• gamma ' volume fraction
• Representative volume element

A representative volume element is introduced to represent the microstructure of gamma/gamma' morphology with periodic boundary conditions to formulate the full mode of the micromechanical analysis. [0 0 1]-oriented alloys with gamma' volume fractions from 60 to 70% are simulated under tensile loading. A raft criterion is implemented into the user subroutine to predict the rafting type. The misfit stress is considered by different thermal expansion coefficients of the two phases. It is very high in gamma phase and slightly decreases with the increasing of gamma' volume fraction. The stress distributions in the two phases change during creep deformation. The creep crack initiation time slightly increases with the increase of gamma' volume fraction. The stress components decrease with the increasing of gamma' volume fraction at the beginning and change due to the stress redistribution during creep loading.

• 出版日期2016
• 单位西安航天动力研究所; 西北工业大学