A Research on Laser Cladding Co-Based Alloy to Repair Heat Resistant Steel of the Valves Used in Ultra-Super Critical Thermal Power Plants

Fuguang Liu; Yong Li; Erjuan Yang; Zihao Mi; Bo Wang; Gang Liu; Menghua Song; Haiou Yang

doi:10.3788/LOP202158.0514007

Laser & Optoelectronics Progress, Volume. 58, Issue 5, 0514007(2021)

A Research on Laser Cladding Co-Based Alloy to Repair Heat Resistant Steel of the Valves Used in Ultra-Super Critical Thermal Power Plants

Fuguang Liu¹, Yong Li¹, Erjuan Yang¹, Zihao Mi¹, Bo Wang¹, Gang Liu¹, Menghua Song^2、*, and Haiou Yang^3、**

Author Affiliations

¹Institute of Welding and Repair Technology for Power Plant Materials, Xi'an Thermal Power Research Institute, Xi'an , Shaanxi 710054, China

²School of Materials Engineering, Xi′an Aeronautical University, Xi'an , Shaanxi 710077, China

³State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi'an , Shaanxi 710072, China

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Figures & Tables(13)

Fig. 1. Laser additive manufacturing system used in the experiment

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Fig. 2. Schematic of laser cladding repair sample

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Fig. 3. Typical microstructures of laser cladding Stellite 6 Co-based alloy. （a） Macrostructure；（b） microstructure

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Fig. 4. XRD patterns of nine samples

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Fig. 5. Hardness profile of laser cladding repair samples. （a） 1#， 2# and 3# samples， parallel to the interface；（b） 1#， 2# and 3# samples， along the deposition direction；（c） 4#， 5# and 6# samples， parallel to the interface；（d） 4#， 5# and 6# samples， along the deposition direction；（e） 7#， 8# and 9# samples， parallel to the interface；（f） 7#， 8# and 9#， along the deposition direction

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Fig. 6. Bending strength of laser cladding repair samples

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Fig. 7. Load-extension curves of laser cladding repair samples in three points bending testing

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Fig. 8. Samples after three-point bending testing. （a） 1# sample；（b） 2# sample；（c） 3# sample；（d） 4# sample；（e） 5# sample；（f） 6# sample；（g） 7# sample；（h） 8# sample；（i） 9# sample

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Fig. 9. Impact properties of laser cladding repair samples

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Fig. 10. Porosity defects in laser cladding repair samples. （a） 2# sample；（b） 4# sample；（c） 7# sample

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Table 1. Chemical composition of SA182 F91 heat resistant steel
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Table 1. Chemical composition of SA182 F91 heat resistant steel
Element Mass fraction/%
C 0.08-0.12
Cr 8.00-9.50
Mo 0.85-1.05
Si 0.20-0.50
Mn 0.30-0.50
V 0.18-0.25
Nb 0.06-0.10
N 0.03-0.07
Fe Bal.

Table 2. Chemical composition of Stellite 6 Co-based alloy powder
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Table 2. Chemical composition of Stellite 6 Co-based alloy powder
Element Mass fraction/%
C 1.15
Si 1.10
Cr 29.00
Mo 1.00
W 4.00
Fe 3.00
Ni 3.00
Mn 0.50
Co Bal.

Table 3. Parameters used in laser cladding repair experiment

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Table 3. Parameters used in laser cladding repair experiment

No.	Spot size/mm	Power/W	Scanning speed/（mm·min^-1）	Feeding rate /（g·min^-1）	Lateral offset /mm	Vertical offset/mm
1	3	1000	600	10.24	2	0.70
2	3	1500	720	10.24	2	0.70
3	3	2000	840	8.96	2	0.50
4	4	1000	720	8.96	2.2	0.45
5	4	1500	840	8.96	2.2	0.45
6	4	2000	600	8.96	2.2	0.60
7	5	1000	840	8.96	2.5	0.40
8	5	1500	600	8.96	2.5	0.60
9	5	2000	720	8.96	2.5	0.60

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Fuguang Liu, Yong Li, Erjuan Yang, Zihao Mi, Bo Wang, Gang Liu, Menghua Song, Haiou Yang. A Research on Laser Cladding Co-Based Alloy to Repair Heat Resistant Steel of the Valves Used in Ultra-Super Critical Thermal Power Plants[J]. Laser & Optoelectronics Progress, 2021, 58(5): 0514007

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