Chinese Journal of Lasers, Volume. 46, Issue 3, 0302003(2019)
Microstructure and Electrochemical Corrosion Behavior of TC4 Titanium Alloy Cladding Layer Prepared with Powder Feeding Laser Additive Manufacturing
Figures & Tables(13)
Fig. 2. XRD diffraction spectra of cladding layers prepared at different scanning speeds
Fig. 3. Cross-section of samples prepared at different scanning speeds. (a) 4 mm/s, bonding zone of the substrate and cladding layer; (b) 10 mm/s, bonding zone of the substrate and cladding layer; (c) 16 mm/s, bonding zone of the substrate and cladding layer; (d) β-grain boundary; (e) 4 mm/s, middle of cladding layer; (f) 10 mm/s, middle of cladding layer; (g) 16 mm/s, cladding layer; (h) substrate
Fig. 5. Tested microhardness of cladding layer prepared at different scanning speeds. (a) Microhardness distribution; (b) average microhardness; (c) microhardness difference
Fig. 6. Polarization curves of dynamic potential of cladding layers prepared at different scanning speeds
Fig. 7. EIS results of cladding layers prepared at different scanning speeds. (a) Nyquist curves; (b) bode diagram
Fig. 9. SEM images of cladding layers prepared at different scanning speeds. (a) 4 mm/s; (b) 10 mm/s; (c) 16 mm/s; (d) substrate
Table 1. Chemical composition of TC4 alloy powders
View tableTable 1. Chemical composition of TC4 alloy powders
Elements Ti Al V Fe C N H O Mass fraction /% Bal. 6.15 4.05 0.28 0.08 0.04 0.01 0.18
Table 2. Standard corrosion parameters of polarization curve
View tableTable 2. Standard corrosion parameters of polarization curve
Sample E corr /Vi corr /(μA·cm-2)E pp /Vv corr /(mm·a-1)R p /ΩCladding layer (4 mm·s-1) -0.6884 4.6202 0.8884 0.054344 25144 Cladding layer (10 mm·s-1) -0.4371 1.2337 1.1871 0.014511 98966 Cladding layer (16 mm·s-1) -0.7065 9.4097 0.8565 0.110680 12975 Substrate -0.4822 0.6265 1.3322 0.007369 145800
Table 3. Electrical parameters of equivalent simulated circuit
View tableTable 3. Electrical parameters of equivalent simulated circuit
Sample R s /(Ω·cm-2) Q c-Y 0 /(10-5 Ω-1· s-n ·cm-2)n R t /(Ω·cm-2) C dl /(10-4 F·cm-2) R ct /(Ω·cm-2) e /%Cladding layer (4 mm·s-1) 1.810 4.673 0.907 2585 6.048 6506 <6.191 Cladding layer (10 mm·s-1) 1.425 2.608 0.918 13400 1.169 11500 <3.946 Cladding layer (16 mm·s-1) 1.592 15.52 0.908 1637 252.1 1332 <2.324 Substrate 1.258 2.191 0.778 1403 0.125 97390 <3.327
Table 4. Pitting parameters of cladding layers prepared at different scanning speeds
View tableTable 4. Pitting parameters of cladding layers prepared at different scanning speeds
Sample E b /VE p /VE b-E p /VCladding layer (4 mm·s-1) -0.68257 0.24067 -0.92324 Cladding layer (10 mm·s-1) -0.31881 1.14370 -1.46251 Cladding layer (16 mm·s-1) -0.68937 0.27289 -0.97226 Substrate -0.23934 1.40060 -1.63994
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Xiaotian Feng, Hong Gu, Shengfeng Zhou, Jianbo Lei. Microstructure and Electrochemical Corrosion Behavior of TC4 Titanium Alloy Cladding Layer Prepared with Powder Feeding Laser Additive Manufacturing[J]. Chinese Journal of Lasers, 2019, 46(3): 0302003
Paper Information
Category: laser manufacturing
Received: Oct. 9, 2018
Accepted: Nov. 23, 2018
Published Online: May. 9, 2019
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