Machining Science and Technology· 2026Q2
Nanostructured surface layer and high-cycle fatigue behavior at 850 °C of single-crystal nickel superalloy induced by surface grinding treatment
- 1citations
- Q2SCImago
- 2026year
Short summary
Surface grinding treatment (SGT) of single-crystal nickel superalloy (SCNS) DD6 at 850 °C creates a nanostructured surface layer (∼60 nm grains) that suppresses fatigue crack initiation and extends high-cycle fatigue life compared to samples with larger grains and surface defects.
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Key points
- Surface grinding treatment (SGT) creates a nanostructured surface layer (∼60 nm grains) on SCNS DD6 at 850 °C.
- The nanostructured surface layer suppresses fatigue crack initiation.
- Defect-free nanostructured surfaces lead to larger facets on the fracture surface.
- Quasi-cleavage fracture mechanism dominates HCF behavior in ground DD6 samples at 850 °C.
AI-generated from the title and abstract; the full text is not read.
Abstract
The microstructures in the surface layer by surface grinding treatment (SGT) and their fractographic features in high-cycle fatigue (HCF) at 850 °C are investigated for single-crystal nickel superalloy (SCNS) DD6. All samples after SGT show the nanostructure transition from single crystal to polycrystalline grains. Furthermore, the sample with nano-sized grains (∼60 nm) and a defect-free grinding surface suppresses fatigue crack initiation and exhibits large facets on the fracture surface; however, the sample with large grains and many grinding surface defects shows the tiny cleavage step fracture initiated from multiple fatigue source sites. The fractographic features indicate that the quasi-cleavage fracture mechanism dominates high-cycle fatigue behavior at 850 °C of the ground DD6 sample.
The authors' abstract, as published at the source. Machining Science and Technology, 2026 · DOI ↗
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Field: Mechanical Engineering
Mechanical EngineeringEngineering