High Temperature Oxidation Behavior of Lc-Sr-31 (Fe-Based) Coatings Produced via Laser Cladding

Fig. 3. Microstructures of laser cladding layer. (a) Top surface of cladding layer; (b) central section of cladding layer; (c) cladding interface; (d) heat affected zone of substrate

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Fig. 4. Oxidation kinetics curves of substrate and Fe-based cladding layer

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Fig. 5. Phase of substrate and cladding layer before and after high temperature oxidization. (a) Substrate; (b) cladding layer

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Fig. 6. Surface morphology features of substrate after high-temperature oxidation for different processing time. (a)(b) 100 h; (c)(d) 200 h

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Fig. 7. Surface morphology of cladding layer after 100-h high-temperature oxidation

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Fig. 8. Surface morphologies of cladding layer after 200-h high-temperature oxidation. (a) Macrostructure; (b) area A; (c) area B

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Table 1. Chemical composition of substrate material and cladding powder
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Table 1. Chemical composition of substrate material and cladding powder
Material Mass fraction /%
C Si Mn Cr Ni Mo P S Fe
Substrate 0.34 0.26 0.67 0.97 0.02 0.16 0.011 0.004 Bal.
Lc-Sr-31 0.18 0.92 0.11 16.8 1.83 1.95 0.006 0.015 Bal.

Table 2. Oxidation kinetics constants of substrate and Fe-based cladding layer
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Table 2. Oxidation kinetics constants of substrate and Fe-based cladding layer
Material Oxidative index n Oxidation rate k_p /(10^-3 mg·mm^-2·h^-1) Time /h Fit coefficient R²
Substrate metal 1.03 7.59 0-200 0.9981
Cladding layer 1.41 1.42 0-70 0.9601

Table 3. Element contents of substrate surface after high-temperature oxidation for different time
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Table 3. Element contents of substrate surface after high-temperature oxidation for different time
Time /h Mass fraction /%
O Si Mn Cr Fe
100 22.59 0.08 0.31 0.14 75.56
200 28.99 0.32 0.48 0.44 65.63

Table 4. Element contents of cladding layer surface after 100-h high-temperature oxidation
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Table 4. Element contents of cladding layer surface after 100-h high-temperature oxidation
Zone Mass fraction /%
O Si Cr Fe Mo Ni
1 15.89 4.93 21.99 55.33 0.61 1.25
2 10.45 4.04 12.80 70.50 0.62 1.60

Table 5. Surface element contents of cladding layer after 200-h high-temperature oxidation
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Table 5. Surface element contents of cladding layer after 200-h high-temperature oxidation
Zone Mass fraction /%
O Si Cr Fe Mo Ni
1 21.87 1.06 36.87 38.87 0.56 0.77
2 12.25 1.22 17.20 67.53 0.42 1.38

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Xiaohui Han, Shao Xie, Hongyu Li, Yan Liu, Hui Chen. High Temperature Oxidation Behavior of Lc-Sr-31 (Fe-Based) Coatings Produced via Laser Cladding[J]. Chinese Journal of Lasers, 2019, 46(12): 1202003

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Paper Information

Category: laser manufacturing

Received: Jun. 11, 2019

Accepted: Aug. 7, 2019

Published Online: Dec. 2, 2019

The Author Email: Han Xiaohui (13793237339@139.com), Chen Hui (xnrpt@163.com)

DOI:10.3788/CJL201946.1202003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Chemical composition of substrate material and cladding powder

Table 1. Chemical composition of substrate material and cladding powder

Table 2. Oxidation kinetics constants of substrate and Fe-based cladding layer

Table 2. Oxidation kinetics constants of substrate and Fe-based cladding layer

Table 3. Element contents of substrate surface after high-temperature oxidation for different time

Table 3. Element contents of substrate surface after high-temperature oxidation for different time

Table 4. Element contents of cladding layer surface after 100-h high-temperature oxidation

Table 4. Element contents of cladding layer surface after 100-h high-temperature oxidation

Table 5. Surface element contents of cladding layer after 200-h high-temperature oxidation

Table 5. Surface element contents of cladding layer after 200-h high-temperature oxidation