Effect of Laser Scanning Speed on Microstructure and Properties of TC4 Alloy Surface Laser Cladding Composite Coating
TAN Jinhua1, SUN Ronglu1,2, NIU Wei1,2, LIU Yanan1, HAO Wenjun1
1 School of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387, China 2 Tianjin Key Laboratory of Advanced Mechatronics Equipment Technology, Tianjin 300387, China
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, TiN0.3, 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.
作者简介: 孙荣禄,天津工业大学教授,博士研究生导师,天津市金工学会副理事长,天津市热处理学会理事,中国机械工程学会失效分析分会专家,中国机械工程学会高级会员。1996年获哈尔滨工业大学材料加工工程专业工学硕士学位;2001年获哈尔滨工业大学材料学工学博士学位;2003年至2005年在天津大学从事博士后研究工作。2002年调入天津工业大学机械电子学院工作。1997年晋升为副教授,2003年晋升为教授,2006年被聘为博士研究生导师。孙荣禄教授主要从事金属材料表面强化和激光材料加工方面的教学和科研工作。先后主持和参加了天津市自然科学基金项目、航天基金项目和武器装备预研项目等多项省部级和企业委托项目。所承担的“激光快速凝固TiC-Ni复合涂层的微观结构和耐磨性能研究”获2005年度天津市自然科学奖,申请国家发明专利两项。孙荣禄教授先后在 Surface and Coating Technology、 Transactions of Nonferrous Metals Society of China、《中国激光》《摩擦学报》《硅酸盐学报》《材料热处理学报》《焊接学报》《稀有金属材料与工程》等国内外专业学术期刊上发表学术论文50余篇,其中30余篇被SCI和EI收录。 谭金花,天津工业大学机械工程学院硕士研究生,主要研究方向为金属材料表面强化和激光材料加工。
引用本文:
谭金花, 孙荣禄, 牛伟, 刘亚楠, 郝文俊. 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[J]. 材料导报, 2020, 34(12): 12094-12100.
TAN Jinhua, SUN Ronglu, NIU Wei, LIU Yanan, HAO Wenjun. Effect of Laser Scanning Speed on Microstructure and Properties of TC4 Alloy Surface Laser Cladding Composite Coating. Materials Reports, 2020, 34(12): 12094-12100.
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2020, Vol. 34 
