| XIE Zhi-ying,LIU Chang-sheng,WU Qiong,CHENG Sui-yuan,LIANG Jing.High Hardness and Wear-resistant Coatings Fabricated by Laser Cladding[J],52(7):25-40 |
| High Hardness and Wear-resistant Coatings Fabricated by Laser Cladding |
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| DOI：10.16490/j.cnki.issn.1001-3660.2023.07.003 |
| KeyWord:laser cladding microhardness wear resistance cladding materials cladding process statistical calculation analogue simulation auxiliary technology |
| Author | Institution |
| XIE Zhi-ying |
Northeastern University, Shenyang , China |
| LIU Chang-sheng |
Northeastern University, Shenyang , China |
| WU Qiong |
Baowu Heavy Industry Co., Ltd., Shanghai , China |
| CHENG Sui-yuan |
Northeastern University, Shenyang , China |
| LIANG Jing |
Northeastern University, Shenyang , China |
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| Abstract: |
| Laser cladding technology has become a technical means to prepare high hardness and wear-resistant coatings because of its advantages such as high deposition efficiency, fast cooling speed, small dilution rate, small thermal deformation, controllable thickness and metallurgical combination. In recent years, with the increasing demand for repair and re- manufacturing in high-end manufacturing equipment, the development and preparation of high hardness and wear-resistant coatings have also drawn great attention and got significant development. The research work related to high hardness and wear-resistant coating fabricated by laser cladding at home and abroad was introduced and the research progress of these works was discussed. The research progress of high hardness and wear-resistant coatings fabricated by laser cladding was reviewed from four aspects:powder design, laser cladding process, statistical calculation and simulation, and laser cladding auxiliary technology. Starting from the four research directions of laser cladding, the action principle of the four research directions in preparing high hardness and wear-resistant coatings, as well as the advantages, disadvantages and application scope of these four aspects were expounded in this paper. In addition, reasonable suggestions for the shortcomings and the future development direction were pointed out. In the aspect of powder design, guided by the coating optimization results, the research on the preparation of high hardness and wear-resistant coatings by second phase strengthening, fine grain strengthening, microstructure optimization and other types of powder design were reviewed. From the perspective of improving coating hardness, reducing coating defects and decreasing residual stress, these powder designs were analyzed and compared, the current research ideas related to powder design were affirmed, the existing design defects were pointed out, and optimization suggestions were put forward. In the aspect of laser cladding process, related works of process adjustment on improving the hardness of laser cladding coating were introduced. In addition, the influence law and mechanism of cladding process on coating composition, geometric morphology, microstructure and mechanical properties were described. The limitations in the research of cladding process of high hardness and wear-resistant coatings were pointed out, and the optimization methods were put forward. Statistical method was conducive to the regulation and prediction of microstructure-properties of cladding coatings. Simulation technology was helpful to simulate and analyze the thermal behavior in the process of coating preparation, and provided a theoretical basis for stress control and process selection for coating preparation. The role of statistical calculation and Simulation in the preparation of coating, cladding process optimization, coating microstructure-properties optimization and cladding theory research was summarized, and the future development direction was put forward. In the aspect of laser cladding auxiliary technology, new laser cladding auxiliary technologies such as ultrasound, electric field, magnetic field, heat source, spectrum and mechanical action were summarized, the research work of auxiliary technology in preparation of high hard and wear-resistant coatings were introduced, the influence and action mechanism of auxiliary technology on the microstructure-properties of coating were expounded, the existing problems of auxiliary technology were points out, and rational suggestions were put forward. For laser cladding high hard and wear-resistant coatings, the relationship between powder design, laser cladding process, statistical calculation, simulation and laser cladding auxiliary technology is mutually reinforcing and complementary. At present, some progress has been made in the research of high hardness and wear-resistant coatings fabricated by laser cladding at home and abroad. However, there are still some deficiencies in coating process control and coating optimization. Only the study of the cladding process on the coating properties and geometric morphology is researched roundly. At last, according to the research status of high hardness and wear-resistant coating fabricated by laser cladding, the development trend of related technologies was prospected. |
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