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Chin. Phys. B, 2019, Vol. 28(2): 026802    DOI: 10.1088/1674-1056/28/2/026802
CONDENSED MATTER: STRUCTURAL, MECHANICAL, AND THERMAL PROPERTIES Prev   Next  

Effect of scanning speeds on electrochemical corrosion resistance of laser cladding TC4 alloy

Xiaotian Feng(冯晓甜), Jianbo Lei(雷剑波), Hong Gu(顾宏), Shengfeng Zhou(周圣丰)
Laser Technology Institute, Tianjin Polytechnic University, Tianjin 300387, China
Abstract  In order to study the effect of scanning speed on the electrochemical corrosion resistance of laser cladding TC4 alloy in artificial seawater, the x-ray diffraction analysis, microstructure of cross-section, microhardness variation, and impedance spectrum have been studied in comparison with the TC4 titanium alloy. The results show that the main phase of cladding coating is α-Ti, and the change of scanning speed has no obvious effect on it; therefore, the supersaturated α-Ti solid solution is formed, and the acicular α' martensite is obtained. As the scanning speed increases, the microstructure of cladding coating is orthogonal basket-weave, the crystal surface spacing decreases, and the average microhardness of laser cladding TC4 alloy slightly increases. When the scanning speed increases to 10 mm/s, the microhardness is about 14.71% higher than that of the substrate, and the electrochemical corrosion resistance of laser cladding TC4 alloy is also improved, which is about 2.48 times more than the substrate. Grain refinement has a great effect on enhancing the anti-electrochemical corrosion.
Keywords:  laser cladding      TC4 alloy      grain refinement      electrochemical corrosion  
Received:  01 October 2018      Revised:  13 December 2018      Published:  05 February 2019
PACS:  68.35.bd (Metals and alloys)  
  82.45.Bb (Corrosion and passivation)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61475117 and 51471084), the National Key Research and Development Program of China (Grant No. 2017YFB1103604), and the Tianjin Municipal Special Program of Talents Development for Excellent Youth Scholars, China (Grant No. TJTZJHQNBJRC-2-15).
Corresponding Authors:  Jianbo Lei, Hong Gu     E-mail:  ljbtj@163.com;guhong1120@163.com

Cite this article: 

Xiaotian Feng(冯晓甜), Jianbo Lei(雷剑波), Hong Gu(顾宏), Shengfeng Zhou(周圣丰) Effect of scanning speeds on electrochemical corrosion resistance of laser cladding TC4 alloy 2019 Chin. Phys. B 28 026802

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