| ZHAO Yun-cai,ZHANG Jia-ru,LIN Xiang.Strength Analysis of Scratch Test-based Laser Remelting Ni-based-WC Cermet Coating[J],46(4):157-164 |
| Strength Analysis of Scratch Test-based Laser Remelting Ni-based-WC Cermet Coating |
| Received:October 19, 2016 Revised:April 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.04.026 |
| KeyWord:laser remelting scratch test cohesive strength bond strength |
| Author | Institution |
| ZHAO Yun-cai |
School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou , China |
| ZHANG Jia-ru |
School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou , China |
| LIN Xiang |
School of Mechanical and Electrical Engineering, Jiangxi University of Science and Technology, Ganzhou , China |
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| Abstract: |
| The work aims to further improve overall performance of plasma spraying Ni-based WC cermet coating on 45# steel substrate by treating the coating with different laser remelting process parameters. Cohesive strength of the coating and bonding strength with substrate were measured by conducting strength scratch test, the former was determined by cone projected area in the scratch test, the cohesive strength was inversely proportional to the cone projected area. The latter was determined based on critical load Lc in feedback data of scratch tester. After 300 W laser remelting, coating cone projected area A was 101 (less than 276 before remelting), cohesive strength of the coating has improved. After laser remelting, critical load Lc was 68 N, greater than 45 N before the remelting, bonding strength of the coating to substrate increased. The cone projected area was 101.6, 56.7 and 198.0 while critical strength was 68 N, 77 N and 41 N, respectively, at the laser power of 300 W, 800 W and 1200 W. The coating fell off at the laser power of 1500 W. Both cohesive strength and bonding strength of the coating improve significantly after laser remelting plasma sprayed Ni-WC cermet coating. In the test data, cohesive strength and bonding strength are the best at the laser power of 800 W. Performance of the coating varies greatly from different laser parameters, appropriate range of parameters can contribute to desired effect. Provided that the laser power parameter is too high, the coating falls off and coating performance decreases when residual stress produced by the coating is greater than cohesive force. |
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