• Chinese Journal of Lasers
  • Vol. 48, Issue 22, 2202010 (2021)
Hongyu Zhang, Min Yu*, Junwei Hua, and Hui Chen
Author Affiliations
  • 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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    DOI: 10.3788/CJL202148.2202010 Cite this Article Set citation alerts
    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 Copy Citation Text show less
    SEM morphology of Fe-Cr-Mo powder
    Fig. 1. SEM morphology of Fe-Cr-Mo powder
    Micro-shear test. (a) Schematic of the test; (b) size of the sample
    Fig. 2. Micro-shear test. (a) Schematic of the test; (b) size of the sample
    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
    Cross-sectional microstructures of Fe-Cr cladding layer. (a) Cladding zone; (b) SEM morphology of cladding layer; (c) fusion zone
    Fig. 4. Cross-sectional microstructures of Fe-Cr cladding layer. (a) Cladding zone; (b) SEM morphology of cladding layer; (c) fusion zone
    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
    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
    Hardness of cladding layer. (a) Average hardness of each cladding layer; (b) evolution of hardness from cladding layer to substrate
    Fig. 6. Hardness of cladding layer. (a) Average hardness of each cladding layer; (b) evolution of hardness from cladding layer to substrate
    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
    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
    Shear properties of cladding layer with different Mo contents. (a) Shear strength; (b) shear toughness; (c) ratio of pressure
    Fig. 8. Shear properties of cladding layer with different Mo contents. (a) Shear strength; (b) shear toughness; (c) ratio of pressure
    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
    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
    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
    XRD test results of wear debris of substrate and cladding layers samples
    Fig. 11. XRD test results of wear debris of substrate and cladding layers samples
    Friction and wear test results. (a) Wear volume;(b) average friction coefficient
    Fig. 12. Friction and wear test results. (a) Wear volume;(b) average friction coefficient
    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
    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
    ElementCSiMnPSCrNiMoCuFe
    Mass fraction /%0.2570.3440.7480.0080.0021.0390.2570.2460.151Bal.
    Table 1. Chemical composition of base material
    ElementSiMnBCrNiFe
    Mass fraction /%1.5--30.6--1.22.9443--4.4Bal.
    Table 2. Chemical composition of Fe-Cr alloy powder
    ParameterValue
    Laser power /W1800
    Beam diameter /mm3
    Scanning velocity /(mm·min-1)200
    Powder feeding voltage /V3.2
    Shielding gas flow /(L·min-1)30
    Powder flow rate /(L·min-1)6.5
    Overlap ratio40%
    Table 3. Laser cladding parameters
    ElementCSiMnPSCrFe
    Mass fraction /%0.510.320.740.0170.0060.19Bal.
    Table 4. Chemical composition of R7 wheel steel
    Cladding layerMass fraction/%
    SiMoCrMnFe
    Fe-Cr+10%Mo1.12.96.60.688.8
    Fe-Cr+30%Mo0.024.47.30.467.9
    Fe-Cr+50%Mo0.726.74.70.467.6
    Fe-Cr+70%Mo0.637.22.10.159.8
    Table 5. Chemical composition of four Fe-Cr-Mo cladding layers
    PointMass fraction/%
    CrFeMo
    A4.693.30.6
    B7.1788.72.8
    C3.883.311.5
    D5.366.826.6
    E4.978.215.6
    F4.776.514.0
    G2.567.129.3
    H2.663.632.8
    Table 6. Chemical composition of eight test points in Fig.5
    Mass fraction /%0103050
    DHV_G0.16480.13550.02460.1163
    Table 7. Hardness gradient damage of laser cladding samples
    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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