Optimization of microstructure and properties of composite coatings by laser cladding on titanium alloy

The synthesis of hard composite coating on titanium alloy by laser cladding of Al/Fe/Ni+C/Si3N4 pre-placed powders has been investigated in detail. SEM result indicated that a composite coating with metallurgical joint to the substrate was formed. XRD result indicated that the composite coating mainly consisted of γ- (Fe, Ni) , FeAl , Ti3Al , TiC , TiNi , TiC0.3N0.7 , Ti2N , SiC , Ti5Si3 and TiNi . Compared with Ti-3Al-2V substrate, an improvement of the micro-hardness and the wear resistance was observed for this composite coating.

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Ti-based composite coatings with gradient TiC x reinforcements on TC4 titanium alloy prepared by laser cladding

Science China Technological Sciences ◽

10.1007/s11431-014-5566-5 ◽

2014 ◽

Vol 57 (7) ◽

pp. 1454-1461 ◽

Cited By ~ 14

Author(s):

ShuNv Liu ◽

ZongDe Liu ◽

Yang Wang ◽

Peng Yue

Keyword(s):

Titanium Alloy ◽

Laser Cladding ◽

Composite Coatings ◽

Tc4 Titanium Alloy

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Effect of Y2 O3 on microstructural characteristics and wear resistance of cobalt-based composite coatings produced on TA15 titanium alloy surface by laser cladding

Surface and Interface Analysis ◽

10.1002/sia.5697 ◽

2014 ◽

Vol 47 (2) ◽

pp. 239-244 ◽

Cited By ~ 9

Author(s):

Donghua Lu ◽

Shasha Liu ◽

Xiaoyu Zhang ◽

Weiping Zhang

Keyword(s):

Wear Resistance ◽

Titanium Alloy ◽

Laser Cladding ◽

Composite Coatings ◽

Alloy Surface ◽

Microstructural Characteristics ◽

Ta15 Titanium Alloy

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Microstructure and Corrosion of Laser Cladding Coatings on Titanium Alloy With Nd2O3

Journal of Engineering Materials and Technology ◽

10.1115/1.4048280 ◽

2020 ◽

Vol 143 (1) ◽

Author(s):

Guangyu Han ◽

Youfeng Zhang

Keyword(s):

Corrosion Resistance ◽

Titanium Alloy ◽

Laser Cladding ◽

Electrical Impedance ◽

Composite Coatings ◽

Electrical Impedance Spectroscopy ◽

Corrosion Properties ◽

Capacitive Behavior ◽

Refined Microstructure

Abstract Composite coatings of TiB were successfully obtained on the surface of a Ti–6Al–4V alloy by in situ laser cladding technology using Ti/B/Nd2O3 powders. The microstructure and corrosion resistance of the fabricated composite coatings were investigated because relevant studies have been thus far limited in this field. The results indicate that the cladding coating and the substrate combined well via metallurgy after laser cladding treatment, and no obvious cracks were observed in the cladding coatings. The coatings comprise only the TiB and the α-Ti phase. The addition of Nd2O3 promoted the formation of a uniform and refined microstructure of the cladding coatings, and a well-defined structure was obtained when the added Nd2O3 content was 2 wt%. The microhardness of the cladding coating obviously improved by 3 to 4 fold above that of the Ti–6Al–4V substrate. Moreover, the corrosion properties significantly improved by adding Nd2O3 into the coatings. Electrical impedance spectroscopy and polarization tests showed that the best corrosion resistance of the cladding coating was achieved with the addition of 2 wt% Nd2O3. All samples revealed obvious near-capacitive behavior after immersion in a corrosive medium.

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