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<p>In this study, the microstructural transformation and nano hardness variation in high-speed laser cladding(HSLC) IN625 layer and Q245R substrate in different oxidation temperatures were studied. A C-enriched banded area was detected at the interface, exhibiting a significant increase in the thickness of the banded area as the temperature increased during the high-temperature oxidation. In addition, the C content required to form the banded area gradually decreased as the temperature increased. When the temperature decreased below 700&#xa0;°C, Cr-rich carbides were predominantly formed in banded areas. More Mo-rich carbides and δ phase precipitated in the banded area at 800&#xa0;°C. Simultaneously, the micro-strain in the banded area increased, while the recrystallization in this region was inhibited. The distribution of nano hardness in the HSLC layer corresponded with the concentration of C elements, with the maximum nano hardness in the banded area measuring 12.06 GPa after oxidation at 600&#xa0;°C for 200&#xa0;h. The banded area gradually becomes brittle as the oxidation temperature increases.</p> Graphical Abstract <p></p>

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Effect of Temperature on Microstructure and Nanoindentation Variation of High-Speed Laser Cladding IN625

  • 期刊论文

  • 发表日期：

    2025年11月18日

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  • Kai Fu,
  • Xuechong Ren,
  • Xiaoming Wang,
  • Cheng Zhong,
  • Yanpeng Xue,
  • Benli Luan

摘要

In this study, the microstructural transformation and nano hardness variation in high-speed laser cladding(HSLC) IN625 layer and Q245R substrate in different oxidation temperatures were studied. A C-enriched banded area was detected at the interface, exhibiting a significant increase in the thickness of the banded area as the temperature increased during the high-temperature oxidation. In addition, the C content required to form the banded area gradually decreased as the temperature increased. When the temperature decreased below 700 °C, Cr-rich carbides were predominantly formed in banded areas. More Mo-rich carbides and δ phase precipitated in the banded area at 800 °C. Simultaneously, the micro-strain in the banded area increased, while the recrystallization in this region was inhibited. The distribution of nano hardness in the HSLC layer corresponded with the concentration of C elements, with the maximum nano hardness in the banded area measuring 12.06 GPa after oxidation at 600 °C for 200 h. The banded area gradually becomes brittle as the oxidation temperature increases.

Graphical Abstract