On the wear mechanism of cubic boron nitride base cutting tools

Performance and wear mechanisms of whisker-reinforced alumina, coated and uncoated PCBN tools when high-speed turning aged Inconel 718

“…Since the tool material is a composite with cBN and binder phases, chemical reactions and eutectics with both can be a decisive wear mechanism. Indeed, Klimenko et al [21] have shown formation of Fe-Fe 2 B eutectics with cBN, while Gimenez et al [22] found formation of Fe-C perlite-like structures of as a result of interaction of pure iron with TiC binder. Other reactions of cBN with Ni (Ni 3 N), Mo (Mo 2 N), Cr (CrB, Cr 2 B), etc.…”

“…It can be seen that the deposit has a porous structure which consists of bound individual particles. According to conclusions of Klimenko et al [21] such structure can be a result of ejection of eutectic melt from the cutting zone in the shape of droplets and their subsequent reaction with environment and coolant.…”

“…For machining with PCBN, its formation is typically attributed either to formation of low-melting-point eutectic between tool and workpiece materials which is subsequently ejected from the cutting zone, or to chemical reactions of tool material with workpiece, coolant, etc. [21], or both. Since the tool material is a composite with cBN and binder phases, chemical reactions and eutectics with both can be a decisive wear mechanism.…”

A comparative study on cutting tool performance in end milling of AISI D3 tool steel

“…For example, in finish hard turning of AISI 52100 steel (63 HRC), it was reported that the flank wear on the low CBN content tool was nearly half of that on the high CBN content tool under the same cutting conditions (V c = 120 m/min, f = 12.5 m/rev, a p = 50 m) [30]. There have been many explanations toward this interesting phenomenon [31][32][33][34][35]. Chou et al [30] explain this in terms of high affinity of metallic binder of high CBN content tool to steel, as a result of which more severe adhesion occurs and consequently, CBN particles are plucked out due to loss of binder resulting in increased abrasive wear.…”

Evaluation of machining performance of STAVAX with PCBN tools

“…Barry and Byrne [9] found that a chemical reaction between the BN phase and work material inclusions resulted in both wear and the formation of compounds that could protect the binder phase against dissolution/diffusion wear. Klimenko et al [10] noted the presence of reaction products, in the form of micron-sized dendritic spherical particles, on the worn surfaces of the PCBN tools.…”