Study of wear performance and tribological characterization of AlTiN PVD coatings with different Al/Ti ratios during ultra-high speed turning of stainless steel 304. (April 2021)

• Record Type: Journal Article
• Authors: He, Qianxi; DePaiva, Jose M.; Kohlscheen, Joern; Beake, Ben D.; Veldhuis, Stephen C.
• Is Part Of: International journal of refractory metals & hard materials. Volume 96(2021)
• Publication Date: 2021-04
• Subjects: AlTiN PVD coatings with various Al/Ti ratios -- Ultra-high speed turning of SS304 -- Tribological performance; Heat resistant alloys -- Periodicals; Refractory materials -- Periodicals; Metallography -- Periodicals; Alliages réfractaires -- Périodiques; Matériaux réfractaires -- Périodiques; Métallographie -- Périodiques; Heat resistant alloys; Metallography; Refractory materials; Periodicals; Electronic journals; 669.73
• DOI: 10.1016/j.ijrmhm.2021.105488
• Languages: English
• ISSNs: 0263-4368

Abstract

Abstract: AlTiN coatings with different Al/Ti ratios (50/50, 60/40, 67/33, 70/30 and 73/27) deposited by cathodic arc PVD are investigated in this paper. An ultra-high speed of 420 m/min was applied during the finish turning tests of stainless steel 304 (SS304). The coating structure was characterized by SEM and XRD techniques. Assorted mechanical properties such as elastic modulus, coating adhesion, hardness and micro-scratch fracture toughness were assessed using nano-indentation and scratch testing. Chip characterization was performed to evaluate the tribological characteristics of the tool/chip interface. The wear performance study showed that cratering was the main wear mechanism. Tool life results have shown that the Al60Ti40 coating featured the longest tool life due to its favorable combination of tribological and micro-mechanical properties. Highlights: Ultra-high speed finish-turning (420 m/min) of stainless steel 304 was conducted in this study since there was no relatively work reported. Five different Al/Ti ratios in AlTiN PVD coating were investigated in order to determine the most suitable cutting tool in terms of tribological and mechanical properties. The intensive crater wear was found to lead to tool failure instead of regularly observed flank wear due to intensive temperatures generated on the tool rake face.