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<p>Nickel-based superalloys like IN738 are crucial for high-temperature applications due to their excellent mechanical properties. However, laser cladding (LC) of such alloys often leads to cracking, significantly limiting their usage scenarios. In this paper, the cracking behavior of IN738 alloy during laser cladding is investigated, identifying solidification cracks concentrated primarily adjacent grain boundaries and heat-affected zones, alongside cracking induced by grain boundary sliding under internal stresses. A novel approach to mitigate cracking involves doping a small amount of IN718 powder into IN738 powder. The experimental results show that adding 20&#xa0;wt.% IN718 powder can effectively inhibit cracking, yielding crack-free coatings with comparable microhardness and wear resistance. By observing the microstructure of the samples, it can be found that the <i>γ</i>′ phase precipitation and internal stress distribution are influenced by the IN718 content. By this method, internal stresses and stress concentrations at grain boundaries can be effectively reduced, thus reducing cracks. This method holds potential for improving the forming quality of high-content <i>γ</i>′ phase alloys.</p>

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Microstructure and Properties of Inconel738/Inconel718 Composite Coatings Prepared By Laser Cladding

  • 期刊论文

  • 发表日期：

    2025年7月31日

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  • Aihu Wu,
  • Xiaojin Miao,
  • Meiping Wu,
  • Hang Wang,
  • Xin Jin,
  • Jie Li,
  • Hao Tang

摘要

Nickel-based superalloys like IN738 are crucial for high-temperature applications due to their excellent mechanical properties. However, laser cladding (LC) of such alloys often leads to cracking, significantly limiting their usage scenarios. In this paper, the cracking behavior of IN738 alloy during laser cladding is investigated, identifying solidification cracks concentrated primarily adjacent grain boundaries and heat-affected zones, alongside cracking induced by grain boundary sliding under internal stresses. A novel approach to mitigate cracking involves doping a small amount of IN718 powder into IN738 powder. The experimental results show that adding 20 wt.% IN718 powder can effectively inhibit cracking, yielding crack-free coatings with comparable microhardness and wear resistance. By observing the microstructure of the samples, it can be found that the γ′ phase precipitation and internal stress distribution are influenced by the IN718 content. By this method, internal stresses and stress concentrations at grain boundaries can be effectively reduced, thus reducing cracks. This method holds potential for improving the forming quality of high-content γ′ phase alloys.