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Technical Briefs

Effect of Nitro-Carburizing Treatment on Wear Mechanism and Friction of Steel/WC-Co Sliding Couple

[+] Author and Article Information
F. Fazlalipour, N. Shakib

Research and Development Department Iran Radiator Co. Ltd, Rasht, Iran 433718-7966

A. Shokuhfar

Advanced Materials and Nanotechnology Research Lab, Mechanical and Materials Engineering Department,  K. N. Toosi University of Technology, Tehran, Iran 19395-1999

M. Niki Nushari

Research and Development Department Iran Radiator Co. Ltd, Rasht, Iran 433718-7966

J. Tribol 134(1), 014501 (Feb 09, 2012) (6 pages) doi:10.1115/1.4005521 History: Received April 07, 2011; Revised November 17, 2011; Published February 08, 2012; Online February 09, 2012

In this work, tribological behavior and material degradation mechanisms of Nitro-carburized AISI H11 hot work tool steel were investigated during sliding against cemented tungsten carbide (WC/Co). The diffusion layer with an iron-nitrocarbide (Fe (N,C)) compound layer was developed on pre-hardened tool steel by a low temperature Ferritic Nitro-Carburizing (FNC) process in a gas medium. The X-ray diffraction analysis, microhardness testing, and optical microscopy were employed to indicate the properties of the compound and diffusion layers. Friction and wear tests were carried out by using the pin-on-disk technique under severe wear condition, and a wear map was provided for different load and sliding distance. Results of SEM secondary and backscatter imaging of wear scar together with EDS analysis of wear debris showed insignificant two-body abrasion wear system and oxide tribo-film on the nitro-carburized samples. In the case of the hardened sample, intensive plastic deformation on the surface, adhesion, and disk materials transfer developed three-body abrasive wear and a degradation mechanism. It was concluded that a lower material degradation rate and the friction coefficient of nitro-carburized steel in comparison with the hardened sample can be related to the formation of a protective oxide layer and a gradual increase in hardness from surface to substrate.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 1

X-ray diffraction pattern of nitro-carburized AISI H11 steel

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Figure 2

Compound layer and diffusion layer on the cross-section of nitro-carburized AISI H11 steel

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Figure 3

Sintered WC particles with the Co (dark) binder

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Figure 4

Microhardnesses profiles of the NC and HT specimens

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Figure 5

Variation of wear scar depth for the NC and HT samples

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Figure 6

Influence of sliding distance and normal load on cumulative weight loss for (a) HT and (b) NC sample

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Figure 7

Friction coefficients of NC and HT samples during sliding against WC/Co pin

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Figure 8

SEM image of HT disk wear scar with plastic deformation and plowed area

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Figure 9

SEM image of the pin in contact with HT disk consisting of adhered nodular particles

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Figure 10

BSI image and EDS analysis of the pin in contact with the HT disk after 700 m sliding distance

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Figure 11

SEM image of NC disk wear scar with polished and adhered regions

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Figure 12

SEM image of the pin in contact with NC disk with a burnished layer

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Figure 13

BSI image and EDS analysis of the pin in contact with NC disk after a sliding distance of 700 m

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