Laser cladding of in situ TiB2/Fe composite coating on steel |
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Authors: | Baoshuai Du Shiyao Qu |
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Institution: | School of Materials Science and Engineering, Shandong University, Jinan 250061, China |
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Abstract: | To enhance the wear resistance of mechanical components, laser cladding has been applied to deposit in situ TiB2/Fe composite coating on steel using ferrotitanium and ferroboron as the coating precursor. The phase constituents and microstructure of the composite coating were investigated using X-ray diffraction (XRD), scanning electron micrograph (SEM) and electron probe microanalysis (EPMA). Microhardness tester and block-on-ring wear tester were employed to measure the microhardness and dry-sliding wear resistance of the composite coating. Results show that defect-free composite coating with metallurgical joint to the steel substrate can be obtained. Phases presented in the coating consist of TiB2 and α-Fe. TiB2 particles which are formed in situ via nucleation-growth mechanism are distributed uniformly in the α-Fe matrix with blocky morphology. The microhardness and wear properties of the composite coating improved significantly in comparison to the as-received steel substrate due to the presence of the hard reinforcement TiB2. |
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Keywords: | In situ TiB2/Fe composite coating Laser cladding Ferrotitanium Ferroboron |
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