Tribology and Lubricants

  • 제34권6호
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  • Pages.217-225
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  • 2018
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  • 2713-8011(pISSN)
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  • 2713-802X(eISSN)
한국트라이볼로지학회 (Korean Tribology Society)
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Tribological Performance of Ni-Cr Composite Coating Sprayed onto AISI 4340 (SNCM439) Steel by High Velocity Oxygen Fuel

  • 투고 : 2018.08.20
  • 심사 : 2018.10.23
  • 발행 : 2018.12.31
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⟨ 이전 논문 다음 논문 ⟩

초록

In this study, we spray a Ni-Cr composite powder onto AISI 4340 steel using the high velocity oxygen fuel method. We subsequently subject the Ni-Cr coating (as-sprayed) to ultrasonic nanocrystal surface modification (UNSM) process to improve the tribological performance. This study aims at increasing the wear resistance and durability of the Ni-Cr coating by altering the surface integrity and microstructure via the UNSM process. The UNSM process reduces the surface roughness of the as-sprayed coating by about 64%, which is explained by observing the elimination of high peaks and valleys and filling up micro-pores. Furthermore, a change in the microstructure of the coating due to continuous high-frequency strikes to the surface by a tip can lead to an increase in hardness from about 48 to 60 HRC. Furthermore, we investigate the characterization of the friction and wear behavior of Ni-Cr coating by a ball-on-disc tribometer in the dry conditions. We determine that after the UNSM process, there is a significant reduction in the friction coefficient of the as-sprayed coating from approximately 1.1 to 0.75. This is owing to the increased hardness and smoothed surface roughness. In addition, we investigate the surface morphology and wear track of the coatings before and after the UNSM process using a scanning electron microscope, energy dispersive spectrometer, and three-dimensional laser scanning microscope. We observe that the wear track of the Ni-Cr coating after the UNSM process is lower than that of the as-sprayed one. Thus, we confirm that the UNSM process has a significant influence on the improvement of the tribological performance of the Ni-Cr composite coating.

키워드

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Fig. 1. Surface morphology of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 1. Surface morphology of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 2. 3D LSM images of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 2. 3D LSM images of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 3. EDS mapping of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 3. EDS mapping of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 4. Cross-sectional SEM images of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 4. Cross-sectional SEM images of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 5. Comparison in the surface roughness of the as-sprayed and UNSM-treated Ni-Cr composite coatings.

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Fig. 5. Comparison in the surface roughness of the as-sprayed and UNSM-treated Ni-Cr composite coatings.

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Fig. 6. Comparison in the surface hardness of as-sprayed and UNSM-treated Ni-Cr composite coatings.

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Fig. 6. Comparison in the surface hardness of as-sprayed and UNSM-treated Ni-Cr composite coatings.

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Fig. 7. Comparison in the friction coefficient of the as-sprayed and UNSM-treated Ni-Cr composite coatings.

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Fig. 7. Comparison in the friction coefficient of the as-sprayed and UNSM-treated Ni-Cr composite coatings.

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Fig. 8. Comparison in the wear track profile of the as-sprayed and UNSM-treated Ni-Cr composite coatings.

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Fig. 8. Comparison in the wear track profile of the as-sprayed and UNSM-treated Ni-Cr composite coatings.

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Fig. 9. SEM images of wear tracks of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 9. SEM images of wear tracks of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 10. 3D LSM images of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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Fig. 10. 3D LSM images of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

Table 1. UNSM process parameters

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Table 1. UNSM process parameters

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Table 2. Friction and wear test conditions

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Table 2. Friction and wear test conditions

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Table 3. Comparison in the chemical composition of the as-sprayed and UNSM-treated Ni-Cr composite coatings

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Table 3. Comparison in the chemical composition of the as-sprayed and UNSM-treated Ni-Cr composite coatings

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