Preparation and Analysis of Laser Cladding Hard Coating on TC4 Surface

doi:10.12141/j.issn.1000-565X.220605

Abstract

Abstract:

In order to solve the shortcomings of low hardness and poor wear resistance of TC4 titanium alloy, this study prepared titanium-based hard coatings reinforced by HfC, TaC and ZrC ternary ceramic phases (0%, 5%, 10%, 15%, respectively ) on TC4 surface by 4 kW high-power Laser4000 semiconductor laser with laser cladding technology. After the cladding, the cladding parts were cut, polished and corroded to prepare metallographic samples. The macroscopic morphology, microstructure and properties of the cladding coatings with different material components were compared and analyzed by EM electron microscope, SEM scanning electron microscope, EDS energy spectrometer and XRD diffractometer. The macro hardness value of the cladding layer was measured by TH120 A Leeb hardness tester, and the micro hardness change rule of the cladding sample section was analyzed by Qness type Vickers microhardness tester. The results show that the addition of ternary ceramic phase makes the cladding layer and the substrate form a good metallurgical bonding, and the substrate and the cladding layer have a clear smooth boundary. The cladding layer is mainly composed of α+β acicular martensite matrix and precipitated rod-like and block-like α phases. The cladding layer of the ternary ceramic reinforcement phase with a mass fraction of 15% is composed of block-like crystals, and the grains are the most coarse. For the coating of the ternary ceramic reinforcement phase with a mass fraction of 5% and 10%, the size of the rod-like and block-like α phases is significantly reduced, the grains are obviously refined, and the structure is more uniform and dense. The main components of the columnar and massive α phases in the cladding layer are Ti and trace Al, Zr, Hf and V elements. The acicular martensite of the coating contains high Al, Zr, Ta and V elements, and the black β phase between the crystals contains trace Zr and Ta elements. It is found that Hf and Ta elements usually exist in different phases. The hardness of the specimens is improved after laser cladding. When the mass fraction of the ternary ceramic addition is 10%, the grain of the cladding layer is the smallest, the distribution is uniform, and the hardness is the highest, reaching 715 HV, which is 2.31 times that of TC4 substrate.

Key words: TC4 titanium alloy, laser cladding, metal ceramic coating, microhardness

CLC Number:

TG174

ZHENG Lijuan, HU Zitao, LIU Shaofeng, et al. Preparation and Analysis of Laser Cladding Hard Coating on TC4 Surface[J]. Journal of South China University of Technology(Natural Science Edition), 2023, 51(6): 146-152.

Figures/Tables 11

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粉末编号	ZrC	TaC	HfC	TC4
T0	0.00	0.00	0.00	100
T1	1.67	1.67	1.67	95
T2	3.33	3.33	3.33	90
T3	5.00	5.00	5.00	85

元素	图7（a）点1	图7（a）点2	图7（a）区域1	图7（b）点1	图7（b）点2	图7（b）点3	图7（b）点4
Ti	95.45	94.77	95.41	93.54	92.53	83.78	94.50
Al	4.55	5.23	4.59	0.58	1.07	7.51	2.99
Zr	0.00	0.00	0.00	1.83	1.91	3.19	0.98
Hf	0.00	0.00	0.00	4.05	4.49	0.00	0.00
Ta	0.00	0.00	0.00	0.00	0.00	5.52	1.53

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