激光扫描速度对TC4合金表面激光熔覆复合涂层组织及性能的影响

doi:10.11896/cldb.19050016

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Abstract The TC4+Ni60/h-BN Ti-based composite coatings were prepared on the surface of TC4 alloy by RFL-C1000 Raycus fiber laser with different laser scanning speeds. The microstructure, phase, hardness, wear mass loss and friction coefficient of the cladding coating were analyzed and tested by SEM, XRD, EDS, microhardness tester, JA 2003 digital display precision balance and friction wear tester. We studied the effect of laser scanning speed on the microstructure and properties of laser cladding coating. The experimental results showed that with the increase of scanning speed, the width, depth, and dilution rate of the laser cladding coating was decreased gradually, but the melting height first increased and then decreased. The cladding coatings with different laser scanning speed are composed of Ti₂Ni, TiN_0.3, TiC, TiB and α-Ti. When the laser scanning speed is low, the enhanced phase agglomeration area is distributed in the substrate by the form of a network. With the increase of scanning speed, the reinforcing phases in the cladding coating form a massive phase agglomeration zone, which is distributed in the substrate by an isolated form. Increasing the laser scanning speed can reduce the wear mass loss and friction coefficient of the cladding coating, improve the hardness and wear resistance of the cladding coating. However, excessive laser scanning speed can cause defects in the cladding coating, such as pores and cracks, which affects the bonding properties between the cladding coating and the substrate. So the optimal laser scanning speed is 10 mm/s.

Key words： laser scanning speed laser cladding titanium alloy microstructure hardness wear resistance

Published: 29 May 2020

CLC number:

TG174

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

About author:: 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's 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 been in Surface and Coa-ting Technology, Transactions of Nonferrous Metals Society of China, China Laser, Journal of Friction, Journal of Silicate, Journal of Heat Treatment of Materials, Transactions of the China Welding Institution, more than 50 academic papers have been published in professional academic journals such as Rare Metal Materials and Engineering, of which more than 30 have been included in SCI and EI

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	TAN Jinhua
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Cite this article:

TAN Jinhua,SUN Ronglu,NIU Wei, et al. Effect of Laser Scanning Speed on Microstructure and Properties of TC4 Alloy Surface Laser Cladding Composite Coating[J]. Materials Reports, 2020, 34(12): 12094-12100.

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http://www.mater-rep.com/EN/10.11896/cldb.19050016 OR http://www.mater-rep.com/EN/Y2020/V34/I12/12094

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