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Mechanical and Tribological Performance of a Ni-Based Alloy Coating Deposited by Laser Directed Energy Deposition on Gray Cast Iron Substrate

Jean Honorato Ramos, Naiah Domingues Ferracioli

2022entribological performancelaser claddinggray cast ironhardness characterizationmicrostructure

Abstract

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Gray cast iron (GCI) is industrially used due to its balance between cost and properties, particularly in large diesel engine blocks that can be repaired by laser cladding (LC) with Ni-based alloys. This study aimed to parameterize the LC process for depositing Ni-1031 alloy coatings on GCI substrates from used diesel engine blocks, addressing challenges due to GCI's brittle nature and complex thermal cycles during LC. A design of experiments was conducted to define LC parameters, analyzing geometric properties related to laser power, travel speed, hatch spacing, and layer height across single beads, single layers, and multilayers. The results showed that adjustments mitigated metallurgical bonding issues and cracking at the interface with the C-rich GCI substrate, yielding refinement in the microstructure of the coatings with dendritic grains. The coatings exhibited enhanced hardness due to solid-solution strengthening and the presence of B and Cr-rich precipitates. In tribological assessments using reciprocating ball-on-flat tests, GCI showed superior performance likely owing to its smoother contact surface and lubricant effect from graphite, leading to reduced friction, wear rate, and severity of wear mechanisms.

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Cite This Work

@article{cb7bcb5a-48a3-4eee-ba6b-7bbff65351b3,
  title={Mechanical and Tribological Performance of a Ni-Based Alloy Coating Deposited by Laser Directed Energy Deposition on Gray Cast Iron Substrate},
  author={Jean Honorato Ramos and Naiah Domingues Ferracioli},
  year={2022},
  language={en}
}
TY  - JOUR
TI  - Mechanical and Tribological Performance of a Ni-Based Alloy Coating Deposited by Laser Directed Energy Deposition on Gray Cast Iron Substrate
AU  - Jean Honorato Ramos
AU  - Naiah Domingues Ferracioli
PY  - 2022
LA  - en
ER  -

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