Experimental Study on Laser Metal Deposition of FGMs with Ultrasonic Vibration

2012 ◽  
Vol 271-272 ◽  
pp. 131-135 ◽  
Author(s):  
Lan Yun Qin ◽  
Wei Wang ◽  
Guang Yang
Keyword(s):  
Ultrasonic Vibration ◽  
Metal Deposition ◽  
Functionally Graded ◽  
Laser Metal Deposition ◽  
Vibration System ◽  
Hard Phase ◽  
Graded Materials ◽  
Vibration Effect ◽  
Distribution Uniformity ◽  
Microstructure And Mechanical Property

Referring to the ultrasonic vibration effect on casting, welding and laser cladding, the paper demonstrates the feasibility that it can be also used in Laser Metal Deposition(LMD)of titanium alloy to protect the defects such as crack,pore and oxidation and refine the grain size and improve the distribution uniformity of solidified structure.So the paper applies ultrasonic vibration system to fabricate the functionally graded materials(FGMs) samples and analyses its effect on the specimen microstructure and mechanical property by experiments.The results show that ultrasonic vibration can suppress the formation of pore、refine the grain and make the TiC hard phase more homogeneous in the FGMs parts, which is also indicated by the microhardness tests

Application of Laser Metal Deposition for Fabrication of Titanium Matrix Wear-Resistant Coating and its Wearing Performance

2010 ◽  
Vol 44-47 ◽  
pp. 316-320 ◽  
Author(s):  
Lan Yun Qin ◽  
Guang Yang ◽  
Wei Wang ◽  
Ming Tong ◽  
Xing Liang Wang
Keyword(s):  
Metal Deposition ◽  
Functionally Graded ◽  
Dry Sliding Wear ◽  
Laser Metal Deposition ◽  
Titanium Matrix ◽  
Wear Properties ◽  
Graded Materials ◽  
Gradient Distribution ◽  
Deposition Direction ◽  
In Situ Tic

TiC reinforced titanium matrix functionally graded materials （FGM） has been produced by processes of laser metal deposition through changing the powder feed rate of Ti and Cr3C2 powder. The OM, SEM, EDS methods were used to analyze the components and microstructure of the coatings. Microhardness and wearing resistance at room temperature of the FGM coating were examined by microhardness tester and wear tester respectively. The results show that FGM coating reinforced by in-situ TiC apparently improved hardness of Ti alloy; the microhardness can reach HV1100, and present gradient distribution along deposition direction. Dry sliding wear properties of these FGM coatings have been compared with substrate materials wearing. The observed wearing mechanisms are summarized and related to detailed microstructural observations. The results show the wear resistance of the coating can be improved by 46.6 times.

Fabrication of Functionally Graded Ti and γ-TiAl by Laser Metal Deposition

JOM ◽  
2017 ◽  
Vol 69 (12) ◽  
pp. 2756-2761 ◽  
Author(s):  
Lei Yan ◽  
Xueyang Chen ◽  
Yunlu Zhang ◽  
Joseph W. Newkirk ◽  
Frank Liou
Keyword(s):  
Metal Deposition ◽  
Functionally Graded ◽  
Laser Metal Deposition

scholarly journals Microstructure and Mechanical Properties of Al-12Si Alloys Fabricated by Ultrasonic-Assisted Laser Metal Deposition

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 126 ◽  
Author(s):  
Yang Zhang ◽  
Yuqi Guo ◽  
Yan Chen ◽  
Yabin Cao ◽  
Haibo Qi ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Properties ◽  
Ultrasonic Vibration ◽  
Molten Pool ◽  
Maximum Size ◽  
Metal Deposition ◽  
Ultrasonic Power ◽  
Laser Metal Deposition ◽  
Ultrasonic Assisted ◽  
Metallographic Observation

This paper presents a method of ultrasonic-assisted laser metal deposition of Al-12Si alloy. The effects of the ultrasonic power and remelting treatment on the development of porosity, microstructural evolution, and tensile properties of the deposits were investigated. The results suggested that a combination of an ultrasonic vibration and remelting treatment could prolong the existence of the molten pool and the effect of the ultrasound. Therefore, the density of the samples increased from 95.4% to 99.1% compared to the as-prepared samples. The ultrasonic action in the molten pool could not only increase the density of the samples but also refine the grains and improve the tensile properties of the samples. Metallographic observation showed that the maximum size of the primary α-Al dendrites were refined from 277.5 µm to 87.5 µm. The ultimate tensile strength and elongation of the remelting treatment samples with ultrasonic vibration were ~227 ± 3 MPa and 12.2% ± 1.4%, respectively, which were approximately 1.17 and 1.53 times those of the as-prepared samples, respectively. According to the tensile properties and fracture analysis, the density increase dominated the improvement of the mechanical properties.

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