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- Title
Impact Resistance of Thick WC-Ni-Coated Steel Components by Thermal Spray.
- Authors
Zhang, S. J.; Zhu, X. P.; Yuan, J. R.; Lei, M. K.
- Abstract
The impact resistance of coating/substrate systems is still lacking comprehensive understanding, especially for the thermal spray of wear-resistant coatings for coated components in potential applications with heavy-load impact service condition. The impact responses of a thermal spray WC-Ni coating/steel substrate were studied systematically by varying the coating thicknesses from 50 to 300 μm under an impact load of 1–10 kN. Besides conventionally employed crater depth/volume for impact evaluation, a critical impact load is identified to quantify the impact resistance with cracking. Considering the observed cracking modes, two critical loads of Lcc and Lcm have been defined corresponding to the cohesive failure of cracking in coatings and the mixed cohesive–adhesive failure including interface cracking, respectively. Increasing the coating thickness up to 200 μm raised the critical load Lcm from 7.4 to 11.1 kN, followed by a drop to 7.4 kN of Lcc at 300 μm. To reveal the influence of coating thickness, a major surface integrity parameter is proposed as the coating deformation in proportion to the total value of coating/substrate system in correlation to the impact resistance. The dependence of impact resistance on coating thickness is interpreted through the surface integrity changes by the thermodynamic mechanism of effective energy input and dissipation into the coating/substrate system from the external impact load.
- Subjects
METAL spraying; COHESIVE strength (Mechanics); IMPACT loads; STEEL; ENERGY dissipation; SURFACE coatings
- Publication
Journal of Thermal Spray Technology, 2023, Vol 32, Issue 6, p1796
- ISSN
1059-9630
- Publication type
Article
- DOI
10.1007/s11666-023-01604-3