Research on Multilayer and Multipass Laser Cladding Process for U75V Rails

Tong Tong; Jialei Zhu; Xu Liang

doi:10.3788/LOP202158.0714005

Journals >Laser & Optoelectronics Progress >Volume 58 >Issue 7 >Page 0714005 > Article

Laser & Optoelectronics Progress
Vol. 58, Issue 7, 0714005 (2021)

Research on Multilayer and Multipass Laser Cladding Process for U75V Rails

Tong Tong^**, Jialei Zhu^*, and Xu Liang

Author Affiliations

Jingye New Energy Technology and Equipment Innovation R & D Center, Beijing Institute of Petrochemical Technology, Beijing 102617, China

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DOI: 10.3788/LOP202158.0714005 Cite this Article Set citation alerts

Tong Tong, Jialei Zhu, Xu Liang. Research on Multilayer and Multipass Laser Cladding Process for U75V Rails[J]. Laser & Optoelectronics Progress, 2021, 58(7): 0714005 Copy Citation Text

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Fig. 1. Macro cross-section of sample.(a) Without preheating; (b) preheating at 200 ℃

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Fig. 2. Microstructures of multilayer and multipass repair sample.(a) Cladding zone; (b) heat-affected zone

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Fig. 3. Hardness distribution of multilayer and multipass repair sample

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Fig. 4. Relationship between friction coefficient and time for base metal and cladding metal. （a）Base metal; （b） cladding metal

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Element	C	Si	Mn	P	S	V
Mass fraction /%	0.71‒0.80	0.50‒0.80	0.70‒1.05	<0.03	<0.03	0.04‒0.12

Table 1. Chemical composition of U75V rail

Element	C	Si	Mn	Cr	Ni	B	Cu	Fe
Mass fraction /%	≤0.07	≤1.0	≤1.0	14‒15	3.5‒5.5	0.7‒0.9	2.5‒4.5	Bal.

Table 2. Chemical composition of 15-5ph Fe-based alloy powder

Specimen label	Factor				Appearance
Specimen label	Power /W	Cladding speed /(mm·s^-1）	Feeding speed /(g·min^-1）	Preheating temperature /℃	Appearance
A1	900	600	7.58	100
A2	900	600	7.58	200
A3	900	600	7.58	300

Table 3. Appearances of samples prepared at different preheating temperatures

Specimen label	Power /W	Cladding speed /(mm·s^-1）	Feeding speed /（g·min^-1）	Overlapping ratio /%	Z-axis lifting amount /mm
B1	900	600	7.58	58.8	0.4
B2	900	600	7.58	58.8	0.6
B3	900	600	7.58	58.8	0.8

Table 4. Appearances of samples prepared at different Z-axis lifting values

Tong Tong, Jialei Zhu, Xu Liang. Research on Multilayer and Multipass Laser Cladding Process for U75V Rails[J]. Laser & Optoelectronics Progress, 2021, 58(7): 0714005

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