Microstructure and Machinability of Laser Cladding Co-WC on High Speed Steel Tools for Numerical Control Machine Tools

Guiling Hu; Peng Shi; Lei Zhang

doi:10.3788/LOP202259.1114008

Laser & Optoelectronics Progress, Volume. 59, Issue 11, 1114008(2022)

Microstructure and Machinability of Laser Cladding Co-WC on High Speed Steel Tools for Numerical Control Machine Tools

Guiling Hu^*, Peng Shi, and Lei Zhang

College of Mechanical and Electrical Engineering , Henan Vocational University of Science and Technology, Zhoukou 466000, Henan , China

show less

Abstract Get PDF(in Chinese)

Figures & Tables(9)

Fig. 1. Macro morphology and microstructure of repaired tool. (a) Macro morphology of repaired tool; (b) microstructure; (c) EDS element distribution

Download full size

Fig. 2. Experimental results. (a) XRD pattern of damaged high speed steel repair layer; (b) hardness distribution curve

Download full size

Fig. 3. Comparison of friction and wear tests between repaired and unrepaired HSS tools. (a) Comparison of friction coefficients; (b) comparison of mass loss; (c) SEM morphology of original HSS surface; (d) SEM morphology of HSS surface repaired by laser

Download full size

$Bonding strength test of substrate and repair layer. (a) Size of tensile shear specimen; (b) SEM fracture$

Fig. 4. Bonding strength test of substrate and repair layer. (a) Size of tensile shear specimen; (b) SEM fracture

Download full size

Fig. 5. Comparison of wear behavior of two tools after cutting. (a) Cutting model of tool face; (b) original HSS tool; (c) laser repair tool

Download full size

Table 1. Chemical composition of Co alloy powder
View table
Table 1. Chemical composition of Co alloy powder
Element C Cr Mo Ni Si Fe Co
Mass fraction /% 0.28 28.6 5.4 2.27 0.9 0.5 Bal.

Table 2. Thermo-physical properties of WC powder
View table
Table 2. Thermo-physical properties of WC powder
Parameter Density /（kg·m^-3） Melting point /℃ Thermal conductivity /（W·m^-1·K^-1） Thermal expansion coefficient /K^-1 Hardness /HV
Value 15800 2687 84 6.9×10^-6 1650

Table 3. Chemical composition of vacuum cast high speed steel
View table
Table 3. Chemical composition of vacuum cast high speed steel
Element C Cr W V Mo Si Mn Ni
Mass fraction /% 0.81 3.97 6.09 1.73 4.89 0.24 0.27 0.25

Table 4. EDS analysis result of the layer
View table
Table 4. EDS analysis result of the layer
Item Mass fraction %
C Cr W Fe Co Si Mn Ni
Dendritic crystal 2.3 21.9 1.6 2.7 53.4 1.3 0.05 17.1
Equiaxed grain 8.9 35.0 9.3 1.7 36.1 0.9 1.6 6.5
WC particles 5.3 - 94.7 - - - - -
Interface（HAZ） 3.1 8.5 60.3 1.7 21.1 - 0.8 4.5

Tools

Get Citation

Copy Citation Text

Guiling Hu, Peng Shi, Lei Zhang. Microstructure and Machinability of Laser Cladding Co-WC on High Speed Steel Tools for Numerical Control Machine Tools[J]. Laser & Optoelectronics Progress, 2022, 59(11): 1114008

Download Citation

EndNote(RIS)BibTex Plain Text

Set citation alerts for article

Save article for my favorites