| SONG Peng-fang,JIANG Fu-lin,WANG Yu-ling,WANG Ran.Advances in the Preparation of High Entropy Alloy Coatings by Laser Cladding[J],50(1):242-252, 286 |
| Advances in the Preparation of High Entropy Alloy Coatings by Laser Cladding |
| Received:February 24, 2020 Revised:May 06, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2021.01.020 |
| KeyWord:laser cladding high entropy alloy strengthening mechanism solidification behavior numerical simulation |
| Author | Institution |
| SONG Peng-fang |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| JIANG Fu-lin |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| WANG Yu-ling |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
| WANG Ran |
School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao , China |
|
| Hits: |
| Download times: |
| Abstract: |
| Laser cladding is one of the surface modification techniques widely used in today's industry due to its several advantages such as high velocity of heating and cooling, low dilution, small heat affected zone and allows the precise adaptation of surface properties. When the HEAs is prepared by laser cladding technology, it can not only ensure the coating has simple phase structure and excellent performance, but also obtain good metallurgical bonding between the coating and the substrate. In this paper, the design criterion, performance and improvement mechanism, solidification behavior and numerical simulation of the HEAs prepared by laser cladding are described. Firstly, the concept of high entropy alloy is expounded from the design theory. It can be known from the configuration entropy and gibbs free energy that the composition of elements is designed by increasing the principal element (at least 5) and configuration entropy, and the phase stability is controlled by the gibbs free energy. Secondly, the mechanism of coating performance improvement was classified and summarized, among which the combination of the four effects of high entropy alloy and the characteristics of fast cooling and fast heating of laser cladding was the main reason for the improvement of coating performance. In addition, the solidification behavior of the molten pool during the laser cladding process is described, including the grain growth pattern and liquid phase separation during the solidification process, as well as the solidification behavior changes caused by other factors. Moreover, the numerical simulation of powder flow characteristics, temperature field of molten pool and properties of cladding layer and the defects of these models are summarized and analyzed. In the end, the development prospect and application direction of the HEAs prepared by laser cladding are summarized and prospected. |
| Close |
|
|
|