Microstructure and Corrosion Resistance of Laser B<sub>4</sub>C/Cr Alloyed Layer of GCr15 Steel

Bingqian Tong; Zhenxing Li; Qunli Zhang; Zhehe Yao; Zhijun Chen; Jianhua Yao

doi:10.3788/CJL202148.1002119

Chinese Journal of Lasers, Volume. 48, Issue 10, 1002119(2021)

Microstructure and Corrosion Resistance of Laser B₄C/Cr Alloyed Layer of GCr15 Steel

Bingqian Tong^1,2,3, Zhenxing Li^1,2,3, Qunli Zhang^1,2,3, Zhehe Yao^1,2,3, Zhijun Chen^1,2,4, and Jianhua Yao^1,2,3、*

Author Affiliations

¹Institute of Laser Advanced Manufacturing, Zhejiang University of Technology, Hangzhou, Zhejiang 310023, China

²Zhejiang Provincial Collaboration Innovation Center of High-End Laser Manufacturing Equipment, Hangzhou, Zhejiang 310023, China

³College of Mechanical Engineering, Zhejiang University of Technology, Hangzhou, Zhejiang 310023, China

⁴Hangzhou Bohua Laser Technology Co., Ltd., Hangzhou, Zhejiang 311199, China

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Figures & Tables(13)

Fig. 1. Schematic diagram of the LSA experiment

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Fig. 2. Morphologies of single-pass alloyed layer prepared by three kinds of powders. (a) Pure Cr; (b) m(B₄C)∶m(Cr)=1∶16; (c) m(B₄C)∶m(Cr)=1∶8

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Fig. 3. Morphology of the alloyed layer and the surface scanning result of the EDS. (a) Morphology of the alloyed layer; (b) surface scanning results of the EDS

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Fig. 4. Morphologies of alloyed layer prepared by three kinds of powders. (a) Pure Cr; (b) m(B₄C)∶m(Cr)=1∶16; (c) m(B₄C)∶m(Cr)=1∶8

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Fig. 5. SEM images of different depths of the alloyed layer when m(B₄C)∶m(Cr)=1∶16. (a) Surface of the alloyed layer; (b) depth is 300 μm; (c) depth is 450 μm

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Fig. 6. XRD of alloyed layers prepared by three powders

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Fig. 7. Hardnesses of alloyed layers prepared with three powders and substrate

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Fig. 8. Nyquist curve and equivalent circuit of the sample. (a) Nyquist curve; (b) equivalent circuit

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Fig. 9. Polarization curves of alloyed layers prepared with three powders and substrate

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Fig. 10. Morphology of the corroded area. (a) Pure Cr; (b) m(B₄C)∶m(Cr)=1∶16; (c) m(B₄C)∶m(Cr)=1∶8

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Table 1. Mass fraction of the chemical element in GCr15 steel unit: %
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Table 1. Mass fraction of the chemical element in GCr15 steel unit: %
Element C Si Mn Cr Mo Fe
Mass fraction 1.00 0.15 0.25 1.40 0.10 Bal.

Table 2. Fitting parameters of the equivalent circuit
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Table 2. Fitting parameters of the equivalent circuit
Sample R_s / (Ω·cm²) Y₀ / (Ω^-1·s^-ⁿ·cm²) n R_ct / (Ω·cm²)
Substrate 11.01 0.406 0.85 1282
Cr 12.25 0.504 0.87 1607
m(B₄C)∶m(Cr) =1∶16 15.52 0.293 0.89 1807
m(B₄C)∶m(Cr) =1∶8 9.55 0.418 0.86 1770

Table 3. Polarization curve data
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Table 3. Polarization curve data
Sample E_corr/ V I_corr/ (10^-6 A·cm^-2)
Substrate -0.5973 6.714
Cr -0.5459 3.022
m(B₄C)∶m(Cr) =1∶16 -0.5378 2.822
m(B₄C)∶m(Cr) =1∶8 -0.5455 3.706

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Bingqian Tong, Zhenxing Li, Qunli Zhang, Zhehe Yao, Zhijun Chen, Jianhua Yao. Microstructure and Corrosion Resistance of Laser B₄C/Cr Alloyed Layer of GCr15 Steel[J]. Chinese Journal of Lasers, 2021, 48(10): 1002119

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