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This research aims to investigate the microstructure evolution and type IV cracking of P92 steel weld joints under long-term service conditions.

Type IV cracking and creep damage evolution of P92 steel weldment after long-team service

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Randomized trial investigates creep damage evolution in P92 steel weldments, suggesting significant implications for coal-fired power plants.

This research aims to investigate the microstructure evolution and type IV cracking of P92 steel weld joints under long-term service conditions.
Examined P92 welded joints from an USC power plant subjected to 605 °C for 70,000 hours.
Analyzed the distribution of creep cavities and microstructural changes in the fine-grained heat affected zone.
Assessed factors affecting dislocation density and properties such as hardness and recrystallization ratio.
Type IV cracks were detected primarily in the fine-grained heat affected zone (FGHAZ).
Creep cavities were found distributed along grain boundaries, indicating a tendency to coalesce over time.
Microstructure damage was linked to lower dislocation density and reduced solution strengthening due to phase coarsening.

Che et al. (2026) studied this question.

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Randomized trial investigates creep damage evolution in P92 steel weldments, suggesting significant implications for coal-fired power plants.