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Multi-scale study of very-high-cycle fatigue cracking behavior of PBF-LB/GH4169 superalloy at elevated temperature
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DOI：10.1016/j.ijfatigue.2026.109892.png)
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Abstract
En 中文
• At 650 °C, surface defects and internal pores compete as VHCF crack initiation sites. • Compared with 25 ℃, the FCI region expands in HCF and VHCF failures at 650 °C. • CDRX promotes fine-grain formation within the FCI region of internal-pore-initiated VHCF failures. • Thermal exposure and cyclic fatigue promote secondary (Ti,Nb)C precipitation and transformation of γ″ to δ phase.
Keywords:
PBF-LB/GH4169 superalloy
Elevated temperature fatigue
Fatigue failure mechanism
Grain refinement
Precipitate evolution
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6.8
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8.7K
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3.4W
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