Mechanism of solid-state dissolution of WC in Co-based solutions

Effect of Cr addition on solid state sintering of WC–Co alloys

“…Although Cr oxides are reduced at a lower temperature in the C rich alloy, a better wetting of WC grains and a more effective rearrangement occurs in the W rich alloy. It is likely the effect of the higher solubility of WC in the binder of this alloy as no reduction in solubility of W atoms in the solid state was assessed with Cr addition in agreement with previous investigations [30].…”

“…By analysing the Co binder after extraction it was found that an addition of Cr 3 C 2 lowers the W content of the binder in alloys sintered at 1200°C [20]. This result is in contradiction with the analyses of diffusion couples showing no significant influence of Cr on the WC solubility at 1200°C [30]. To further understand the effect of Cr, the composition of the binder was investigated in the alloys heated at 1220°C by TEM/EDS (Table 3).…”

Microstructure Evolution in the Cemented Carbides WC-Co II. Cumulated Effects of Cr Additions and of the C/W Ratio on the Crystal Features of the WC Grains

“…The Co content was 13 at% in the three alloys. The literature data on the constitution of WC-Co-Cr alloys [10][11][12] indicate that for a Co for Cr substitution rate of 3 at%, Cr dissolves in the Co binder but slightly reduces the extent of the two phase fields {WC + Co binder} on the W rich side as it promotes the formation of Co 3 W 3 C. In the field {WC þ Co binder þ Co 3 W 3 C}, Cr is distributed in the binder and Co 3 W 3 C. The few analyses of the Cr doped WC-Co alloys [3,5,6] …”

Influence of temperature on the biaxial strength of cemented carbides with different microstructures

“…3 while in service [1][2][3][4]. It has been reported that the formation of defects at high temperature as a result of oxidation and the growth of the pre-existing flaws are the main causes of the loss of stiffness, mechanical strength and fracture toughness during service [9][10][11][12].…”

“…Only the tested specimens that introduced less uncertainty in the determination of S f were selected. The three fitted lines were imposed to pass through the origin (x=0 and y=0) in order to obtain lines without yintercept, according to equation (4). From the slopes of Fig.…”