Effects of Mo on Microstructure and Properties of Fe-Cr-Mo Laser Cladding Layer

Hongyu Zhang; Min Yu; Junwei Hua; Hui Chen

doi:10.3788/CJL202148.2202010

Chinese Journal of Lasers, Volume. 48, Issue 22, 2202010(2021)

Effects of Mo on Microstructure and Properties of Fe-Cr-Mo Laser Cladding Layer

Hongyu Zhang, Min Yu^*, Junwei Hua, and Hui Chen

Research center of Sichuan Advanced Welding and Surface Engineering, School of Materials Science and Engineering, Southwest Jiaotong University, Chengdu, Sichuan 610063, China

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Figures & Tables(20)

Fig. 1. SEM morphology of Fe-Cr-Mo powder

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Fig. 2. Micro-shear test. (a) Schematic of the test; (b) size of the sample

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$XRD patterns of cladding layers. (a) Fe-Cr cladding layer; (b) Fe-Cr+10%Mo cladding layer; (c) Fe-Cr+30%Mo cladding layer; (d) Fe-Cr+50%Mo cladding layer; (e) Fe-Cr+70%Mo cladding layer; (f) movement of diffraction peaks$

Fig. 3. XRD patterns of cladding layers. (a) Fe-Cr cladding layer; (b) Fe-Cr+10%Mo cladding layer; (c) Fe-Cr+30%Mo cladding layer; (d) Fe-Cr+50%Mo cladding layer; (e) Fe-Cr+70%Mo cladding layer; (f) movement of diffraction peaks

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Fig. 4. Cross-sectional microstructures of Fe-Cr cladding layer. (a) Cladding zone; (b) SEM morphology of cladding layer; (c) fusion zone

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Fig. 5. SEM images of four Fe-Cr-Mo cladding layers. (a) Fe-Cr+10%Mo cladding layer; (b) Fe-Cr+30%Mo cladding layer; (c) Fe-Cr+50%Mo cladding layer; (d) Fe-Cr+70%Mo cladding layer

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Fig. 6. Hardness of cladding layer. (a) Average hardness of each cladding layer; (b) evolution of hardness from cladding layer to substrate

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Fig. 7. Micro-shear test results of four cladding layers. (a) Fe-Cr cladding layer; (b) Fe-Cr+10%Mo cladding layer; (c) Fe-Cr+30%Mo cladding layer; (d) Fe-Cr+50%Mo cladding layer

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Fig. 8. Shear properties of cladding layer with diﬀerent Mo contents. (a) Shear strength; (b) shear toughness; (c) ratio of pressure

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$Shear fracture morphologies of cladding layers with diﬀerent Mo contents. (a) Fe-Cr cladding layer; (b) Fe-Cr+10%Mo cladding layer; (c) Fe-Cr+30%Mo cladding layer; (d) Fe-Cr+50%Mo cladding layer$

Fig. 9. Shear fracture morphologies of cladding layers with diﬀerent Mo contents. (a) Fe-Cr cladding layer; (b) Fe-Cr+10%Mo cladding layer; (c) Fe-Cr+30%Mo cladding layer; (d) Fe-Cr+50%Mo cladding layer

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Fig. 10. Friction coefficient curves of substrate and cladding layers with diﬀerent Mo contents. (a) Substrate; (b) Fe-Cr cladding layer; (c) Fe-Cr+10%Mo cladding layer; (d) Fe-Cr+30%Mo cladding layer; (e) Fe-Cr+50%Mo cladding layer

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Fig. 11. XRD test results of wear debris of substrate and cladding layers samples

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Fig. 12. Friction and wear test results. (a) Wear volume;(b) average friction coefficient

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Fig. 13. Worn surface morphologies of substrate and cladding layer with diﬀerent Mo contents. (a) Substrate; (b) Fe-Cr cladding layer; (c) Fe-Cr+10%Mo cladding layer; (d) Fe-Cr+30%Mo cladding layer; (e) Fe-Cr+50%Mo cladding layer

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Table 1. Chemical composition of base material
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Table 1. Chemical composition of base material
Element C Si Mn P S Cr Ni Mo Cu Fe
Mass fraction /% 0.257 0.344 0.748 0.008 0.002 1.039 0.257 0.246 0.151 Bal.

Table 2. Chemical composition of Fe-Cr alloy powder
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Table 2. Chemical composition of Fe-Cr alloy powder
Element Si Mn B Cr Ni Fe
Mass fraction /% 1.5--3 0.6--1.2 2.9 44 3--4.4 Bal.

Table 3. Laser cladding parameters
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Table 3. Laser cladding parameters
Parameter Value
Laser power /W 1800
Beam diameter /mm 3
Scanning velocity /(mm·min^-1) 200
Powder feeding voltage /V 3.2
Shielding gas flow /(L·min^-1) 30
Powder flow rate /(L·min^-1) 6.5
Overlap ratio 40%

Table 4. Chemical composition of R7 wheel steel
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Table 4. Chemical composition of R7 wheel steel
Element C Si Mn P S Cr Fe
Mass fraction /% 0.51 0.32 0.74 0.017 0.006 0.19 Bal.

Table 5. Chemical composition of four Fe-Cr-Mo cladding layers
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Table 5. Chemical composition of four Fe-Cr-Mo cladding layers
Cladding layer Mass fraction/%
Si Mo Cr Mn Fe
Fe-Cr+10%Mo 1.1 2.9 6.6 0.6 88.8
Fe-Cr+30%Mo 0.0 24.4 7.3 0.4 67.9
Fe-Cr+50%Mo 0.7 26.7 4.7 0.4 67.6
Fe-Cr+70%Mo 0.6 37.2 2.1 0.1 59.8

Table 6. Chemical composition of eight test points in Fig.5
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Table 6. Chemical composition of eight test points in Fig.5
Point Mass fraction/%
Cr Fe Mo
A 4.6 93.3 0.6
B 7.17 88.7 2.8
C 3.8 83.3 11.5
D 5.3 66.8 26.6
E 4.9 78.2 15.6
F 4.7 76.5 14.0
G 2.5 67.1 29.3
H 2.6 63.6 32.8

Table 7. Hardness gradient damage of laser cladding samples
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Table 7. Hardness gradient damage of laser cladding samples
Mass fraction /% 0 10 30 50
D_{HV_G} 0.1648 0.1355 0.0246 0.1163

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Hongyu Zhang, Min Yu, Junwei Hua, Hui Chen. Effects of Mo on Microstructure and Properties of Fe-Cr-Mo Laser Cladding Layer[J]. Chinese Journal of Lasers, 2021, 48(22): 2202010

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