Effect of manufacturing parameters on polycrystalline diamond compact cutting tool stress-state

Impact fatigue fracture of polycrystalline diamond compact (PDC) cutters and the effect of microstructure

“…Figure 9(b) also shows abrupt change in the direction of the main crack as it approaches the interface between the polycrystalline diamond layer and the carbide substrate. This can be attributed to the influence of the high tensile residual stresses in this region [11,12]. The crack bifurcates into two cracks with the small crack continuing in the same direction of the initial crack as shown in Figure 11.…”

“…However, this may not necessarily suggest mixed mode of crack propagation. It may be due to the presence of high pre--existing residual stresses in the PDC cutter [12]. Fracture in this case can still be predominantly under mode I, with the crack following the normal stress or maximum principal stress trajectories.…”

“…Cracks may also be pre--existing from the cutter manufacturing process as internal flaws in the material, which are then grown during application. The constantly changing stress field on the cutter cutting edge due abrasive wear and pre--existing residual stresses [11,12] also play an important role in the fracture process.…”

A Raman spectroscopy investigation into the influence of thermal treatments on the residual stress of polycrystalline diamond

“…Chen et al [9] investigated thermal residual stresses in PCD cutters both experimentally and numerically and found the highest residual stress exists at the interface between the diamond layer and substrate. More recently, Kanyanta et al [10] demonstrated that appropriate choice of sintering conditions are required to reduce the transient stresses during the sintering process.…”

The Wear Analysis Model of Drill Bit Cutting Element with Torsion Vibration

“…Aiming at the existing researches for wear failure of PDC drill bit's cutting element by experts and scholars at home and abroad, the literature [1] thought the transient of PDC drill bit's processing technology (tool cutting, fast cooling, and pressure removal) was a major reason for the formation of microcrack and led to premature failure of the drill bit. The literature [2] described the structure and parameter designs of PDC drill bit in depth and how to improve the service life and reduce the wear rate of PDC drill bit.…”