Machining of martensitic stainless steel (JETHETE) with coated carbides

Abstract

Tool life and wear models were fitted for machining a martensitic stainless steel (JETHETE) with three ceramic-coated carbides [CVD-Ti(C,N)/Al2O3 (T1), CVD-Ti(C,N)/TiC/Al2O3 (T2) and PVD-TiN (T3)] using statistical regression analysis. The statistical analysis revealed the contribution of the cutting speed and feed rate to tool performance to be in excess of 80 per cent, with the cutting speed showing the greater degree of influence. Significant nose wear was the common failure mode observed at higher speed conditions. Plastic deformation and chipping/fracture at the cutting edge were additional failure modes observed when machining with the T2 and T3 tool grades respectively. The coarse grain size and high cobalt content contributed to the very poor performance of the multicoated T2 grade insert, while the improved microhardness of the PVD-TiN coating gave the single layer coated T3 grade a comparable performance with the multicoated T1 grade. Attrition wear was the principal wear mechanism at lower speed conditions, while dissolution/diffusion and abrasion were additional wear mechanisms when machining at higher speed conditions. A higher degree of diffusion wear occurred on the T3 grade insert owing to the relatively lower level of cubic carbides in the tool composition.

Investigation of Coated Cutting Tool Performance during Machining of Super Duplex Stainless Steels through 3D Wear Evaluations

“…Selvaraj et al [13] explained that abrasion wear mechanism is caused by grains broken off during the turning process, which become restricted between the chip and the tool, creating scratches on the flank face of the tool. The same explanation was also suggested by Krolczyk et al [11] and Jawaid et al [15]. Table 4.…”

“…The authors noted that notch wear at the end of depth of cut was the responsible for the end of tool life and that a large amount of the material adhered to the tool wear area. Jawaid et al [15] used CVD Ti(C/N)/TiC/Al 2 O 3 and PVD TiN coated inserts. The authors reported that attrition was the principal wear mechanism at lower speed conditions, while abrasion and diffusion wear mechanisms were the failure modes at higher speed conditions.…”

Evaluation of machining performance of STAVAX with PCBN tools

“…This temperature is high enough to bring about a chemical interaction between the tool and the workpiece constituents. The heat conducted through the tool can weaken the binder/second phase of the tool and thus reduce the wear resistance of the tool [11,25]. Therefore, the low fracture resistance exhibited by tool grades BN 100 and BN 600 could also be attributed to the greater heat adsorption (owing to their high thermal conductivity) of the cutting tools.…”

“…However, most of the work was performed with carbide and ceramic tools [11,12,13]. General assessment of the machined surface was normally obtained by studying the effect of different process parameters and tool wear on the surface finish, waviness and dimensional accuracy.…”

Analysis of Tool Wear Patterns in Rough Turning of Chromium Hardfacing Material

“…Tool wear mechanisms are generally influenced by four phenomenons namely: abrasion, thermal softening, diffusion and notching at depth of cut and trailing edge [6]. Jawaid et al [7] in their research concluded, that significant nose wear was the common failure mode observed at higher speed conditions in machining of martensitic stainless steel with coated carbides. Moreover, plastic deformation and chipping/fracture at the cutting edge were additional failure modes observed within experimental trials.…”