| WANG Ran,WANG Yu-ling,JIANG Fu-lin,YANG Fa-zhan.Effect of Substrate Preheating on Crack Sensitivity of Al2O3-ZrO2 Ceramic Coating Prepared by Laser Cladding[J],51(3):342-352 |
| Effect of Substrate Preheating on Crack Sensitivity of Al2O3-ZrO2 Ceramic Coating Prepared by Laser Cladding |
| Received:March 30, 2021 Revised:September 01, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2022.03.037 |
| KeyWord:laser cladding crack control numerical simulation ceramic coating substrate preheating thermal coupling |
| Author | Institution |
| WANG Ran |
Qingdao University of Technology, Qingdao , China |
| WANG Yu-ling |
Qingdao University of Technology, Qingdao , China |
| JIANG Fu-lin |
Qingdao University of Technology, Qingdao , China |
| YANG Fa-zhan |
Qingdao University of Technology, Qingdao , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to solve the problems of large brittleness and easy cracking of Al2O3-ZrO2 ceramic coating prepared on the surface of titanium alloy, effectively enhance the high temperature and wear resistance of titanium alloy, and expand the application range of titanium alloy under severe conditions such as high temperature and heavy load. The crack sensitivity of Al2O3-ZrO2 ceramic coating prepared on the surface of titanium alloy was improved by substrate preheating, Through the cladding test, microstructure analysis and performance test on the cladding layer, the effects of different preheating temperature on the crack sensitivity of the cladding layer were evaluated respectively. Further, the thermal mechanical coupling model was established through the finite element analysis software to explore the mechanism of the effect of substrate preheating on the crack sensitivity of the cladding layer. The number of cracks in the cladding layer was significantly reduced after the substrate was preheated. When the substrate was preheated at 200 ℃, the fracture toughness of the cladding layer was significantly improved, from 4.7 MPa.m½ to 8.1 MPa.m½. The microstructure of the cladding layer changed from equiaxed crystal and columnar crystal to strip dendrite and cellular crystal. According to the thermal mechanical coupling results under different preheating temperatures, with the increase of preheating temperature, the residual stress in the cladding layer decreased obviously, the stress concentration in the cladding layer was reduced, and the cracking behavior of the cladding layer was restrained. The substrate preheating method can significantly reduce the residual stress in the cladding layer, improve the crack sensitivity of the cladding layer and enhance the toughness of the cladding layer. When the substrate is preheated at 200~300 ℃, the performance of the cladding layer is most obviously improved, which can provide a practical reference basis for inhibiting the occurrence of cracks in the preparation of ceramic coatings. |
| Close |
|
|
|