Tool Wear of Aluminum/Chromium/Tungsten-Based-Coated Cemented Carbide in Cutting Hardened Sintered Steel

Abstract

In order to improve both the scratch strength and the micro-hardness of (Al,Cr)N coating film, the cathode material of an aluminum/chromium/tungsten target was used in adding the tungsten (W) to the cathode material of the aluminum/chromium target. In this study, hardened sintered steel was turned with (Al60,Cr25,W15)N, (Al60,Cr25,W15)(C,N), (Al64,Cr28,W8)(C,N), (Al,Cr)N and (Ti,Al)N coated cemented carbide tools. The tool wear of the coated cemented carbide tool was experimentally investigated. The following results were obtained: (1) In cutting hardened sintered steel at the cutting speed of 0.42 m/s using the (Al60,Cr25,W15)N, the (Al60,Cr25,W15)(C,N), the (Al64,Cr28,W8)(C,N), the (Ti,Al)N and (Al,Cr)N coated tools, the wear progress of the (Al64,Cr28,W8)(C,N) coated tool became slowest among that of the five coated tools. (2) The wear progress of the (Al60,Cr25,W15)(C,N) coated tool was almost equivalent to that of the (Al64,Cr28,W8)(C,N) coated tool. However, at a high cutting speed of 1.67 m/s, the wear progress of the (Al60,Cr25,W16)(C,N) coated tool was faster than that of the (Al64,Cr28,W8)(C,N) coated tool.

Tool Wear of Aluminum / Chromium / Tungsten/ Silicon-Based-Coated Cemented Carbide Tools in Cutting of Hardened Steel

“…However, the results of our study indicate that the critical scratch load, which is the measured value by the scratch test, of the (A l, Cr)N coating film is 77 N and the micro-hardness is 2760 HV 0.25N . Therefore, in order to improve both the scratch strength and the micro-hardness of the (Al, Cr)N coating film, the cathode material of an aluminum / chromium / tungsten-target was used in adding tungsten (W) to the cathode material of the aluminum / chromium target [3]. Furthermore, the hardened sintered steel was turned with the aluminum / chromium / tungsten-based-coated cemented carbide tools.…”

“…Furthermore, the hardened sintered steel was turned with the aluminum / chromium / tungsten-based-coated cemented carbide tools. Compared with commercially available (Al, Cr)N and (Ti, Al)N coated cemented carbide tools, at a low cutting speed of 0.42 m/s, the wear progress of the aluminum/chromium/tungsten-based-coated tool became the slowest [3]. However, the addition of Si to TiN coatings is reported to transform the [111] oriented columnar structure into a dense finely grained structure, and thin films of Ti-Si-N have been deposited by physical vapor deposition to improve the wear resistance of TiN coatings [4].…”

Tool Wear of (Al,Cr,W)/(Al,Cr,W,Si)-Based-Coated Cemented Carbide Tools in Cutting of Hardened Steel

“…Coated cemented carbide tools, which have good fracture toughness and wear resistance, seem to be effective cutting tool materials. TiN, Ti(C,N) and (Ti,Al)N are generally used for the coating film [2].…”

“…The incorporation of Si [9], Y [9], W [10], Fe [11], Zr [12] or Ti [13] into (Cr, Al) N was reported. In cutting hardened steel [14] or sintered steel [15], the wear resistance of (Al, Cr, W) N coated tools with W added to (Al, Cr) N coated tools was improved. The wear resistance of (Al, Cr, W)(C,N) coated tools with C added to (Al,Cr,W) N coated tools was improved [14]- [17].…”

“…In cutting hardened steel [14] or sintered steel [15], the wear resistance of (Al, Cr, W) N coated tools with W added to (Al, Cr) N coated tools was improved. The wear resistance of (Al, Cr, W)(C,N) coated tools with C added to (Al,Cr,W) N coated tools was improved [14]- [17]. Furthermore, the wear resistance of (Al, Cr, W,Si)N coated tools with Si added to (Al, Cr,W) N coated tools was improved [18].…”