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<p>Gray cast iron components in nuclear power plants suffer from surface degradation under harsh conditions. This study investigates the additive repair of defective gray cast iron using double-sided laser cladding, focusing on the effects of laser power and scanning rate on the repair layer’s morphology, microstructure, and mechanical properties. Results indicate that the synergistic effect of these parameters significantly regulates cladding quality. Increasing power or decreasing scanning speed enlarges the cladding dimensions and heat-affected zone (HAZ), while insufficient heat input causes poor bonding. The microstructure exhibits a gradient distribution: the fusion zone (FZ) has fine grains and higher hardness (~ 400 HV) than the substrate (~ 200 HV), while the partial melting zone (PMZ) and HAZ undergo non-equilibrium phase transitions. Under optimal parameters (2400 W, 800&#xa0;mm/min), the repair layer achieves a smooth surface, narrow HAZ (19&#xa0;mm), and improved ultimate tensile strength (~ 250&#xa0;MPa), meeting the FC200 standard. This work provides a process optimization basis for laser cladding repair to extend the service life of critical nuclear components.</p>

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Investigation of the process parameters and performance of double-sided laser cladding repair for gray cast iron in nuclear power critical components

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Ke Xu,
  • Zhixin Deng,
  • Shujun Chen,
  • Tao Yuan,
  • He Shan,
  • Fantong Meng,
  • Guangzhen Xu,
  • Shuwen Wang

摘要

Gray cast iron components in nuclear power plants suffer from surface degradation under harsh conditions. This study investigates the additive repair of defective gray cast iron using double-sided laser cladding, focusing on the effects of laser power and scanning rate on the repair layer’s morphology, microstructure, and mechanical properties. Results indicate that the synergistic effect of these parameters significantly regulates cladding quality. Increasing power or decreasing scanning speed enlarges the cladding dimensions and heat-affected zone (HAZ), while insufficient heat input causes poor bonding. The microstructure exhibits a gradient distribution: the fusion zone (FZ) has fine grains and higher hardness (~ 400 HV) than the substrate (~ 200 HV), while the partial melting zone (PMZ) and HAZ undergo non-equilibrium phase transitions. Under optimal parameters (2400 W, 800 mm/min), the repair layer achieves a smooth surface, narrow HAZ (19 mm), and improved ultimate tensile strength (~ 250 MPa), meeting the FC200 standard. This work provides a process optimization basis for laser cladding repair to extend the service life of critical nuclear components.