Ni基合金激光熔覆层裂纹机理研究

Translated title of the contribution: Study of crack mechanism in Ni-based alloy laser cladding coating

Qi Li, Tao Li, Zupeng Wu, Bowen Shi, Hongchao Zhang

Research output: Contribution to journalArticlepeer-review

Abstract

The Ni-based alloy cladding coating obtained by laser cladding is prone to cracking, which is the main factor leading to the failure of the Ni-based alloy cladding coating. Based on the experimental and microscopic measurement and analysis, with Ni60 cladding coating as the research object, the mechanism of cracking and propagation of cracks in laser cladding coatings are studied from the aspects of microstructure and stress. Synthesizing the microstructure, phase and fracture morphology of the cladding coating, it is found that the crystal structure of the cladding coating is significantly different at different locations. The hardness and crack sensitivity of the coating increase with the increase of the hard phase distribution. The crack of Ni60 cladding coating is quasi-dissociation. The brittle fracture occurs at the top of the cladding layer and extends regularly along the interior of the hard phase. Based on the thermal residual stress model and the Griffith brittle fracture strength model, the cracking criterion of the coating is established. Based on this, the corresponding crack elimination method is proposed, the performance of metal is enhanced.

Translated title of the contributionStudy of crack mechanism in Ni-based alloy laser cladding coating
Original languageChinese (Simplified)
Pages (from-to)159-164
Number of pages6
JournalDalian Ligong Daxue Xuebao/Journal of Dalian University of Technology
Volume60
Issue number2
DOIs
StatePublished - Mar 1 2020

Keywords

  • Crack mechanism
  • Laser cladding
  • Microstructure
  • Ni-based alloy
  • Thermal stress

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