The surface magnetization approach on assessing tribological properties of steels with different TiN coatings

The technology of composite heat treatment is used popularly for low friction and wear resistance of drive elements. A large number of papers about the heat treatment technology had been proposed. Especially, the nitride treatment has been used widely for the purpose of wear resistance and low friction in the industry. Therefore, the self-developed vertical ball/disk friction tester with the measurement system was used to study the effects of nitride on the tribological properties of the low carbon alloy steel—SCM415— in this study. The experiments were conducted under dry and severe wear conditions. The variations of friction coefficient and surface magnetization were simultaneously recorded during dynamic friction process. After each test, the microstructures of the wear particles were observed and analyzed under a SEM, and the depth of wear track is measured by means of a surface tester. According to the experimental results, the wear resistance of the specimens with carburizing-nitride is significantly larger than the case of nitride-carburizing. Moreover, the surface magnetization was especially larger for the case of nitride-carburizing. As a result, the wear particles always stay in the interfaces and the wear mechanism becomes complex. Therefore, it is necessary to put nitride after carburizing for the composite heat treatments.

Download Full-text

The Influence of Plasma Nitriding Pre-Treatment on Tribological Properties of TiN Coatings Deposited by PACVD

Journal of Materials Engineering and Performance ◽

10.1007/s11665-011-9971-7 ◽

2011 ◽

Vol 21 (6) ◽

pp. 958-964 ◽

Cited By ~ 4

Author(s):

M. S. Mahdipoor ◽

F. Mahboubi ◽

Sh. Ahangarani ◽

M. Raoufi ◽

H. Elmkhah

Keyword(s):

Tribological Properties ◽

Plasma Nitriding ◽

Tin Coatings ◽

Pre Treatment

Download Full-text

A Technology of Using Surface Magnetization Variations for Evaluating the Wear-Resistant Properties of the Die Surfaces with Different TiN Films

Materials Science Forum ◽

10.4028/www.scientific.net/msf.594.377 ◽

2008 ◽

Vol 594 ◽

pp. 377-382 ◽

Cited By ~ 5

Author(s):

Yuh Ping Chang ◽

Kuo Hsing Wang ◽

Chao Hsien Lin ◽

Chien Te Liu ◽

Yih Chyun Hwang

Keyword(s):

Friction Coefficient ◽

Tribological Properties ◽

Experimental Results ◽

The Novel ◽

Wear Properties ◽

Wear Resistant ◽

Tin Films ◽

Physical Measurements ◽

Surface Magnetization ◽

Continuous Surface

Generally speaking, the major parameter which has been used to monitor the dynamic tribological properties of the films over the past decades is friction coefficient. However, it has shown low in sensitivity for many cases. Therefore, it is necessary to introduce more improved physical measurements other than the friction coefficient to monitor and control the film tribological characteristics in sliding contacts. In view of this, the novel technology of using instead surface magnetization variations for evaluating the wear-resistant properties of the films is proposed. The experiment was conducted by the pairs of SUS304 rubbing with SKD11 substrate with different TiN films (PVD and CVD) on the surface at different normal loads in dry friction process. According to the experimental results of the dynamic variations of surface magnetization and friction coefficient with the SEM observations of the wear tracks, the effects of normal loads on the friction and wear properties for the die surfaces with different TiN films can be investigated. The experimental results show that the continuous surface magnetization variations can be used to determine the timing of film fracture and the endurance life more accurately than that by the friction coefficient variations as usual. Therefore, the novel method of using surface magnetization variations does show great potentialities for evaluating the tribological properties of the die surfaces with different TiN films.

Download Full-text