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Microstructure and Wear Resistance of Ni-Cr Alloy Laser Cladding Layer with High Cr Content
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Key Laboratory of Power Station Energy Transfer Conversion and System, Ministry of Education, North China Electric Power University, Beijing 102206, China

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General Fund Project in Equipment Pre-research Field (61409220202)

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    Abstract:

    Four kinds of Ni-xCr alloy laser cladding layers (x=20, 40, 60 and 80, wt%) were prepared by high-speed laser cladding technique, and the relationship between microstructure and wear resistance of Ni-Cr alloy laser cladding layers with different Cr contents was investigated. The results show that the four Ni-Cr alloy laser cladding layers all have reticulated dendritic structures. Among them, Ni-20Cr and Ni-40Cr are single-phase γ-(Ni, Cr) solid solutions, and their wear mechanisms are adhesive wear and abrasive wear. With the increase in Cr content, Ni-60Cr and Ni-80Cr are γ-(Ni, Cr) phase and Cr phase, as well as Cr-rich precipitates, and their wear mechanisms are adhesive wear, abrasive wear and fatigue wear. A moderate increase in Cr content can enhance the hardness and wear resistance of Ni-Cr alloy laser cladding layer. However, excessive addition of Cr results in the precipitation of Cr-rich precipitates. The hardness of these precipitates is 2430.4 MPa, which is lower than the hardness of the Ni-60Cr matrix (4024.86 MPa) and Ni-80Cr matrix (7022.68 MPa). A hardness transition zone exists between the Cr-rich precipitates and the matrix. Cracks are likely to initiate and expand in this zone, leading to deep spalling, which is not conducive to the wear-resistant properties of the laser cladding layer. Ni-80Cr has the highest hardness, but its high Cr content leads to a large number of penetrating cracks and Cr-rich precipitates on the surface, ultimately resulting in the worst wear resistance. Ni-60Cr exhibits the best wear resistance due to its high hardness and dense microstructure.

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[Pan Chaoyang, Liu Zongde, Shen Yue, Lu Xinjie, Mao Jie, Wang Xinyu, Li Jiaxuan. Microstructure and Wear Resistance of Ni-Cr Alloy Laser Cladding Layer with High Cr Content[J]. Rare Metal Materials and Engineering,2024,53(9):2438~2445.]
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History
  • Received:December 16,2023
  • Revised:March 19,2024
  • Adopted:March 22,2024
  • Online: September 12,2024
  • Published: September 04,2024