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<p>During the HT-L furnace's operation, the coil is subjected to high-temperature steam scouring, and fatigue cracks are produced. The fatigue cracks’ microstructure characteristics are carefully studied by collecting evidence and specimens, macroscopic morphology observation, metallographic analysis, energy-dispersive spectroscopy (EDS) analysis, and electron backscattering diffraction (EBSD) characterization. It was found that the cracks sprouted at the junction of the coarse crystal and fine grain cluster area. A large number of slip bands appeared on the surface of the coarse crystals, and the cracks had obvious transgranular characteristics. It was also found that the transgranular fatigue crack propagation mainly occurs in regions with a high density of low-angle boundaries, and the region has a large KAM value, and a high Schmidt factor coefficient.</p>

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Microstructure Analysis of Fatigue Cracks on the Flue Gas Side of Water-Cooled Wall Coils of the HT-L Furnace

  • 期刊论文

  • 发表日期：

    2025年1月14日

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  • Ting Yu,
  • Fangfang Zhang,
  • Yuan Wang,
  • Fang Zhang

摘要

During the HT-L furnace's operation, the coil is subjected to high-temperature steam scouring, and fatigue cracks are produced. The fatigue cracks’ microstructure characteristics are carefully studied by collecting evidence and specimens, macroscopic morphology observation, metallographic analysis, energy-dispersive spectroscopy (EDS) analysis, and electron backscattering diffraction (EBSD) characterization. It was found that the cracks sprouted at the junction of the coarse crystal and fine grain cluster area. A large number of slip bands appeared on the surface of the coarse crystals, and the cracks had obvious transgranular characteristics. It was also found that the transgranular fatigue crack propagation mainly occurs in regions with a high density of low-angle boundaries, and the region has a large KAM value, and a high Schmidt factor coefficient.