Scholarlink

<p>In order to solve the problem that ductile iron components of nuclear power plants are prone to cracks, wear and other defects under extreme working conditions, this study used a new nickel-based powder laser cladding technology to perform additive repair on ductile iron and systematically explored the influence of process parameters on the repair quality. By designing five combinations of laser power (2000-2800&#xa0;W) and scanning rate (600-1000&#xa0;mm/min), combined with microstructure characterization and mechanical properties testing, the morphology evolution law of the repair layer and the interface behavior mechanism are revealed. The results show that when the laser power is 2400&#xa0;W and the scanning rate is 800&#xa0;mm/min, the surface of the cladding layer is smooth and dense, the tensile strength is above 450&#xa0;MPa, and the elongation is greater than 10 %, meeting the standard requirements. The nickel-based powder has excellent compatibility with the matrix, forming a <i>γ</i> solid solution to inhibit the formation of the brittle phase and avoid excessive burning of spherical graphite carbon in the partial melting zone. This study provides a theoretical and process basis for efficient laser additive repair and long-life design of nuclear energy equipment.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Study on the Microstructure and Properties of Ductile Iron Repaired by Multi-Pass Laser Cladding

  • 期刊论文

  • 发表日期：

    2025年11月10日

查看全文
  • Minglei Hu,
  • Shujun Chen,
  • Ke Xu,
  • Wei Zhang,
  • Tao Yuan,
  • He Shan,
  • Guangzhen Xu,
  • Fantong Meng,
  • Shuwen Wang

摘要

In order to solve the problem that ductile iron components of nuclear power plants are prone to cracks, wear and other defects under extreme working conditions, this study used a new nickel-based powder laser cladding technology to perform additive repair on ductile iron and systematically explored the influence of process parameters on the repair quality. By designing five combinations of laser power (2000-2800 W) and scanning rate (600-1000 mm/min), combined with microstructure characterization and mechanical properties testing, the morphology evolution law of the repair layer and the interface behavior mechanism are revealed. The results show that when the laser power is 2400 W and the scanning rate is 800 mm/min, the surface of the cladding layer is smooth and dense, the tensile strength is above 450 MPa, and the elongation is greater than 10 %, meeting the standard requirements. The nickel-based powder has excellent compatibility with the matrix, forming a γ solid solution to inhibit the formation of the brittle phase and avoid excessive burning of spherical graphite carbon in the partial melting zone. This study provides a theoretical and process basis for efficient laser additive repair and long-life design of nuclear energy equipment.