Fracture behaviour of WC-Co hardmetals with WC partially substituted by titanium carbide

E-MRS Fall Symposium I: Solutions for Critical Raw Materials Under Extreme Conditions

Szutkowska, M.^1 ; Boniecki, M.^2 ; Cygan, S.^1 ; Kalinka, A.^1 ; Grilli, M.L.^3 ; Balos, S.^4

Institute of Advanced Manufacturing Technology, Cracow, Poland^1

Institute of Electronic Materials Technology, Warsaw, Poland^2

ENEA Energy Technology Department, Rome, Italy^3

Faculty of Technical Sciences, Novi Sad, Serbia^4

关键词: Fracture behaviour;    Friction coefficients;    Hardmetals;    Indentation fracture toughness;    Mechanical and physical properties;    Physical and mechanical properties;    Single edge notched beams;    WC-Co hardmetals;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/329/1/012015/pdf
DOI  :  10.1088/1757-899X/329/1/012015

来源: IOP

【 摘 要 】

The addition of various amounts of TiC0.9phase in the range from 5wt.% to 20wt.% substituting WC phase was applied in WC-Co hardmetals with 9.5 wt.% bonding cobalt phase. The hardmetals were consolidated using Hot Isostatic Pressing (HIP) method at temperature of 1573K and pressure of 1500 atm. The plain strain fracture toughness has been determined from 3PB test on a precracking single edge notched beam (SENB) specimen. The indentation fracture toughness with Vickers cracks for comparison was also measured, which changed from 12 to 9.0 MPa•m1/2. The amount of the TiC0.9phase affected the mechanical and physical properties: Vickers hardness from 12.5 to 14.0 GPa, Young's modulus from 550 to 460 GPa, density from 13.1 to 9.6 g/cm3, friction coefficient from 0.24 to 0.45, fracture toughness from 16.8 to 11.0 MPa•m1/2. Scanning electron microscopy (SEM), X-ray and electron diffraction phase analysis were used to examine the WC-Co hardmetal with addition of the TiC0.9phase. For comparison, physical and mechanical properties of the WC-Co hardmetals before modification were tested.