A Study of the Internal Deformation Fields and the Related Microstructure Evolution during Thermal Fatigue Tests of a Single-Crystal Ni-Base Superalloy
Cui Zong, Sujie Liu, Guangcai Ma, Yi Guo, Zhaohui Huang
TL;DR
This study examines how thermal fatigue affects the microstructure of a nickel-based superalloy used in harsh environments like turbine blades.
Contribution
The paper introduces detailed insights into stress field evolution and dislocation behavior during thermal fatigue in single-crystal superalloys.
Findings
Stress concentrations decay exponentially from notches and are modified by crack growth and dislocation emission.
Crack initiation follows crystallographic traces and is weakly linked to carbides and dendrites.
Local plasticity and dislocations increase stored energy, but no large-scale recrystallization occurs despite thermal cycling.
Abstract
Ni-base superalloys operate in harsh service conditions where cyclic heating and cooling introduce deformation fields that need to be investigated in detail. We used the high-angular-resolution electron backscatter diffraction method to study the evolution of internal stress fields and dislocation density distributions in carbides, dendrites, and notch tips. The results indicate that the stress concentrations decay exponentially away from the notch, and this pattern of distribution was modified by the growth of cracks and the emission of dislocations from the crack tip. Crack initiation follows crystallographic traces and is weakly correlated with carbides and dendrites. Thermal cycles introduce local plasticity around carbides, the dendrite boundary, and cracks. The dislocations lead to higher local stored energy than the critical value that is often cited to induce recrystallization.…
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Taxonomy
TopicsHigh Temperature Alloys and Creep · Microstructure and Mechanical Properties of Steels · Metallurgy and Material Forming