TC4合金激光熔覆材料的研究现状

doi:10.11896/cldb.19050077

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Abstract TC4 alloy belongs to (α+β) dual-phase alloy, it is widely used in the field of aerospace because of its advantages such as small density, high specific strength, high temperature resistance, corrosion resistance, non-magnetic and good compatibility. However, the low hardness and poor wear resistance of TC4 alloy limit its application and promotion to a large extent. So it is of great significance to modify the surface of TC4 alloy.
Laser cladding technology is a new surface modification technology and it has been widely used in the field of surface modification of TC4 alloy due to its advantages in processable materials, high efficiency, good compatibility between cladding layer and substrate, material saving, environmental protection and pollution-free. Surface modification of TC4 titanium alloy by laser cladding technology began in 1980s. After nearly 40 years of research and exploration, researchers found that the factors affecting the quality and properties of the cladding layer were laser cladding materials, laser processing parameters and processing conditions.After considering the influence of various factors on the cladding layer, it is found that the laser cladding material plays a decisive role in the quality and performance of the cladding layer.
According to the composition of materials, cladding materials can be classified into metal and metal alloy powder, ceramic powder, nano-ceramic powder, metal-ceramic composite powder and other powders. Among them, metals and their alloys have very high hardness, but they are not resistant to high temperature, so they are suitable for using at temperatures of 400 —900 ℃. Ceramic materials have high hardness and high melting point. They can be used as reinforcing phase in laser cladding process, but their toughness is low and cracks are easy to occur. Nano-ceramic materials can effectively alleviate the stress concentration at the interface and reduce the cracks and pore defects in the cladding layer. Cermet composites can combine the strength and toughness of metals with the wear resistance and high temperature resistance of ceramics by laser cladding technology, which is a research hotspot in the field of laser cladding at present. Other cladding materials, such as rare earth and its oxide powder, solid lubricant powder and coated powder have specific properties, and the properties of cladding layer can be significantly improved by adding a small amount of such powder into the cladding powder.
This paper summarizes the research results of improving the surface properties of TC4 alloy by changing the composition of cladding powder.The classification of cladding powders is introduced.The advantages, disadvantages and application occasions of various powders are introduced. It is pointed out that the main problem of surface modification of TC4 alloy is the cracking of cladding layer. The causes of cracking are analyzed and the corresponding solutions are put forward.

Key words： TC4 titanium alloy laser cladding cladding material wear resistance

Published: 14 July 2020

CLC number:

TG174

Fund:This work was financially supported by National Natural Science Foundation of China(51371125).

About author:: Jinhua Tan is a master in School of Mechanical Engineering, Tianjin Polytechnic University. The main research interests are surface strengthening of metal materials and processing of laser materials.
Ronglu Sun is a professor of Tianjin Polytechnic University, a doctoral tutor, a vice chairman of the Tianjin Metalworking Society, a director of the Tianjin Heat Treatment Society, an expert of the Failure Analysis Branch of the China Mechanical Engineering Society, and a senior member of the China Mechanical Enginee-ring Society. In 1996, he obtained a master degree in material processing engineering from Harbin Institute of Technology. In 2001, he obtained a doctorate degree in materials engineering from Harbin Institute of Technology. From 2003 to 2005, he worked in post-doctoral research in the materials science and engineering discipline of Tianjin University. In 2002, he was transferred to the Institute of Mechanical Electronics of Tianjin Polytechnic University. In 1997, he was promoted to associate professor. In 2003, he was promoted to professor. In 2006, he was hired as a doctoral tutor. Professor Sun Ronglu is mainly engaged in the teaching and research of surface strengthening of metal mate-rials and processing of laser materials. He has presided over and participated in many provincial and ministerial-level and
enterprise commissioned projects including Tianjin Natural Science Fund Project, Space Fund Project and Weapons and Equipment Pre-research Project. The research on the “microstructure and wear resistance of laser rapid solidification TiC-Ni composite coating” won the 2005 Tianjin Natural Science Award and applied for two national invention patents. Professor Sun Ronglu has published more than 50 academic papers in Surface and Coating Technology, Transactions of Nonferrous Metals Society of China, China Laser, Journal of Friction, Journal of Silicate, Journal of Heat Treatment of Materials, Journal of Welding and Rare Metal Materials and Engineering, of which more than 30 have been included in SCI and EI.

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Cite this article:

TAN Jinhua,SUN Ronglu,NIU Wei, et al. Research Status of TC4 Alloy Laser Cladding Materials[J]. Materials Reports, 2020, 34(15): 15132-15137.

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http://www.mater-rep.com/EN/10.11896/cldb.19050077 OR http://www.mater-rep.com/EN/Y2020/V34/I15/15132

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