SEDL / STP / STP1362-EB / STP15740S

Turning of High Strength Steel Alloy with PVD- and CVD-Coated Inserts

Jawaid, A
Professor, Associate Dean of Engineering, Coventry University, Coventry,

Olajire, KA
Research student, Coventry University, Coventry,

Pages: 15    Published: Jan 1998

Download this paper for $25 PDF (436K)          View License Agreement
Abstract

PVD TiN-coated(T1) and CVD Ti(C,N)/TiC/Al²O³-coated(T2) inserts were used to machine a high strength low-alloy(HSLA) steel to assess their performance. The single-layer PVD-coated insert gave comparable tool life results to the triple-layer CVD-coated insert due to better coating adhesion, finer grain size and lower cobalt content. Observed active failure modes at high cutting speeds and feed rate were mainly chipping/fracture on the minor cutting edge for T1 and excessive nose wear for T2. The wear mechanisms on the former were interfacial sliding, dissolution/diffusion, and attrition wear mechanisms, while the latter wore principally by interfacial sliding and plastic deformation.