Tool wear of AlCrW-based-coatings on cemented carbide tools prepared by arc ion plating in dry cutting of alloy steel AISI 5120H

Abstract

To improve both the critical scratch load and micro-hardness of (Al, Cr) N coating film, (Al, Cr, W)-based coating film was developed. In this study, to clarify the tool wear of the (Al,Cr,W)-based coated tool in the cutting of alloy steel AISI 5120H, the wear progress and wear mechanism of the coating film in the cutting of alloy steel AISI 5120H using six types of (Al,Cr,W)-based coated tools were investigated. The cutting conditions were a cutting speed of 5.00 m/s, feed rate of 0.25 mm/rev and cutting depth of 0.1 mm. The following results were obtained: 1) The wear progress of the (Al64,Cr28,W8)N-coated tool was slower than that of the (Al60,Cr25,W15)N-coated tool. 2) When a (Al64,Cr28,W8)-target was used to deposit a cemented carbide with a bias voltage of -150 V, the wear progress of the (Al64,Cr28,W8)N coated tool was slightly slower than that of the (Al64,Cr28,W8)(C,N)- or the (Al64,Cr28,W8)C-coated tool. 3) The wear progress of the (Al64,Cr28,W8)N coated tool with a bias voltage of -80 V was the slowest.