Microstructure and Properties of Laser Clad Ti2Ni+TiC+Al2O3+CrxSy Composite Coating on Ti811 Alloy

doi:10.11901/1005.3093.2021.211

Chinese Journal of Materials Research

2022, Vol. 36

Issue (1): 62-72 DOI: 10.11901/1005.3093.2021.211

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Microstructure and Properties of Laser Clad Ti₂Ni+TiC+Al₂O₃+Cr_xS_y Composite Coating on Ti811 Alloy

LI Rui¹(

), WANG Hao¹, ZHANG Tiangang², NIU Wei³

^1.Engineering Technology Training Center, Civil Aviation University of China, Tianjin 300300, China
^2.College of Aeronautical Engineering, Civil Aviation University of China, Tianjin 300300, China
^3.College of Mechanical Engineering, Tianjin Polytechnic University, Tianjin 300387, China

Cite this article:

LI Rui, WANG Hao, ZHANG Tiangang, NIU Wei. Microstructure and Properties of Laser Clad Ti₂Ni+TiC+Al₂O₃+Cr_xS_y Composite Coating on Ti811 Alloy. Chinese Journal of Materials Research, 2022, 36(1): 62-72.

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Abstract

The composite coating of Ti₂Ni+TiC+Al₂O₃+Cr_xS_y was laser cladded on the surface of Ti811 alloy via coaxial powder feeding technology with mixed powders TC4+Ni45+Al₂O₃+MoS₂+Y₂O₃ as cladding material. The microstructure, microhardness, friction and wear properties of the coating were characterized by means of SEM, EDS, XRD, microhardness tester and friction tester. The results show that the Ni and C of Ti811 alloy react with Ti respectively during laser cladding, so that the intermetallic compound Ti₂Ni and hard reinforced phase TiC can form in situ, while the soft lubrication phase Cr_xS_y also formed due to the sulfurization reaction between S and Cr after the decomposition of MoS₂. The Ti₂Ni-phase may present as network-like, TiC as spheroidal and dendritic, while Al₂O₃ as punctiform, which all uniformly distributed in the clad coating. The combined action of strengthening of the hard phase and lubrication of the soft phase makes the laser clad coating with higher microhardness and better wear resistance. When the laser power is 900W the average microhardness of the clad coating reaches 1303.5HV_0.5 with the best wear resistance.

Key words: surface and interface in the materials laser cladding composite coatings titanium alloy in-situ tribological properties

Received: 02 April 2021

ZTFLH:

TB331

Fund: Joint Funds of the National Natural Science Foundation of China(U1633104);Teaching and Research Program of Tianjin Science and Technology Commission(2019KJ119);Fundamental Research Funds for the Central Universities(3122017017)

About author: LI Rui, Tel: 13821201303, E-mail: ruili@cauc.edu.cn

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.211 OR https://www.cjmr.org/EN/Y2022/V36/I1/62

Table 1 Main chemical composition of Ti811 alloy (mass fraction,%)

Table 2 Main chemical composition of TC4 (mass fraction, %)

Table 3 Main chemical composition of Ni45 (mass fraction,%)

Fig.1 Surface morphologies of laser cladding layers (a) N1, (b) N2, (c) N3, (d) crack distribution of N2 layer

Fig.2 Cross section macrograph of laser cladding coatings with different laser power (a) N1, (b) N2, (c) N3

Fig.3 X-ray diffraction patterns of laser cladding coatings with different laser power

Fig.4 Cross section microstructure of laser cladding coatings with different laser power (a) N1, (b) N2, (c) N3

Fig.5 Microstructure of laser cladding coating with different laser power N1: (a~c), N2: (d~f), N3: (g~i); magnified 1 K (a, d, g), magnified 4 K (b, e, h), magnified 10 K (c, f, i)

Fig.6 Element distribution in cladding coating of Sample N2. SEM micrograph (a), Ti (b), Ni (c), Al (d), V (e), Cr (f), O (g), C (h)

Table 4 Energy spectrum analysis results of feature phase

Fig.7 Binary alloy phase diagram of Ti-C

Fig.8 Microhardness of laser cladding coating

Fig.9 Wear surface morphologies of Ti811 and coating with different laser power Ti811 substrate: (a), N1: (b), N2: (c), N3: (d)

Fig.10 Friction coefficients of Ti811 substrate and laser cladding coatings with different laser power

Fig.11 Wear rate and wear mass loss of the composite coating and substrate

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