[논문]Tribological Performance of Ni-Cr Composite Coating Sprayed onto AISI 4340 (SNCM439) Steel by High Velocity Oxygen Fuel

Umarov, Rakhmatjon; Pyun, Young-Sik; Amanov, Auezhan

doi:10.9725/kts.2018.34.6.217

Tribological Performance of Ni-Cr Composite Coating Sprayed onto AISI 4340 (SNCM439) Steel by High Velocity Oxygen Fuel 원문보기

한국윤활학회지 = Tribology and lubricants, v.34 no.6, 2018년, pp.217 - 225

Umarov, Rakhmatjon (Dept. of Mechanical Engineering, Sun Moon University) , Pyun, Young-Sik (Dept. of Mechanical Engineering, Sun Moon University) , Amanov, Auezhan (Dept. of Mechanical Engineering, Sun Moon University)

Abstract ▼ AI-Helper

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.

주제어

표/그림 (13)

표 Table 1. UNSM process parameters
표 Table 2. Friction and wear test conditions
그림 Fig. 1. Surface morphology of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.
그림 Fig. 2. 3D LSM images of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.
그림 Fig. 3. EDS mapping of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.
그림 Fig. 4. Cross-sectional SEM images of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.
표 Table 3. Comparison in the chemical composition of the as-sprayed and UNSM-treated Ni-Cr composite coatings
그림 Fig. 5. Comparison in the surface roughness of the as-sprayed and UNSM-treated Ni-Cr composite coatings.
그림 Fig. 6. Comparison in the surface hardness of as-sprayed and UNSM-treated Ni-Cr composite coatings.
그림 Fig. 7. Comparison in the friction coefficient of the as-sprayed and UNSM-treated Ni-Cr composite coatings.
그림 Fig. 8. Comparison in the wear track profile of the as-sprayed and UNSM-treated Ni-Cr composite coatings.
그림 Fig. 9. SEM images of wear tracks of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.
그림 Fig. 10. 3D LSM images of the as-sprayed (a) and UNSM-treated (b) Ni-Cr composite coatings.

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문제 정의

The main mechanism of improvement in friction and wear behavior was associated with the increase in surface hardness, reduction in surface roughness due to the elimination of open micro-pores and closure of surface cracks due to the continuous strikes at a high-frequency [6]. Hence, the objective of this study is to improve the tribological performance of Ni-Cr composite coating deposited onto AISI 4340 (SNCM439) steel by HVOF method in order to improve the durability of the coating. The friction coefficient and wear resistance of the UNSM-treated coatings wereevaluated and the obtained results were compared with those of the as-sprayed coatings.

제안 방법

Figs. 1, 2 and 3 present SEM morphology along with EDS mapping and 3D LSM images showing the surface morphology and distribution of chemical elements over the scanned area of the as-sprayed and UNSM-treated coatings, respectively. As shown in Fig.
In this study, an ultrasonic nanocrystal surface modification (UNSM) process was applied to a Ni-Cr coating deposited by HVOF method to improve its tribological performance. Previously, it has been proved that the UNSM process was able to reduce the friction coefficient together with the enhanced wear resistance of the TSCs [5].
In this study, the influence of UNSM process on tribological performance of Ni-Cr composite coating sprayed onto AISI 4340 steel by HVOF was investigated. Obtained results of the coating after the UNSM process were compared with the as-sprayed coating and the following conclusions may be drawn from this study:
Both the measurements were repeated 3 times in order to achieve a reliable result. The surface morphology, wear track and chemical alteration of the coatings before and after UNSM process were analyzed using a scanning electron microscopy (SEM: JSM-6510, Jeol, Japan) and athree-dimensional laser scanning microscopy (3DLSM: VK-X100, Keyence, Japan) and also energy dispersive spectroscopy (EDS: JED2300, Japan).

대상 데이터

As a substrate, the polished AISI 4340 steel with dimensions of 100 mm × 10 mm × 4 mm was chosen.
The Ni-Cr composite powder with an average particle size ranging from 50 to 75 μm, (≥99.5% purity, Hardfacing Co., Ltd., Korea) were selected as the precursor materials.

이론/모형

In this study, a Ni-Cr composite powder was sprayed onto AISI 4340 steel by HVOF method. The Ni-Cr composite powder with an average particle size ranging from 50 to 75 μm, (≥99.

참고문헌 (18)

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상세보기
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상세보기
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