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TECHNICAL PAPERS

Effects of Molybdenum Content and Heat Treatment on Mechanical and Tribological Properties of a Low-Carbon Stellite® Alloy

[+] Author and Article Information
Ping Huang

Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada

Rong Liu

Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canadarliu@mae.carleton.ca

Xijia Wu

 Institute for Aerospace Research, National Research Council Canada, Ottawa, ON, K1A 0R6, Canada

Matthew X. Yao

 Deloro Stellite Inc., Belleville, ON, K8N 5C4, Canada

J. Eng. Mater. Technol 129(4), 523-529 (Dec 13, 2006) (7 pages) doi:10.1115/1.2744429 History: Received August 22, 2006; Revised December 13, 2006

The chemical composition of Stellite® 21 alloy was modified by doubling the molybdenum (Mo) content for enhanced corrosion and wear resistance. The specimens were fabricated using a casting technique. Half of the specimens experienced a heat treatment at 1050°C for an hour. The microstructure and phase analyses of the specimens were conducted using electron scanning microscopy and X-ray diffraction. The mechanical properties of the specimens were determined in terms of the ASTM Standard Test Method for Tension Testing of Metallic Materials (E8-96). The mechanical behaviors of individual phases in the specimen materials were investigated using a nano-indentation technique. The wear resistance of the specimens was evaluated on a ball-on-disk tribometer. The experimental results revealed that the increased Mo content had significant effects on the mechanical and tribological properties of the low-carbon Stellite® alloy and the heat treatment also influenced these properties.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

SEM images of microstructure of Stellite® 21: (a) X500 and (b) X1500

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Figure 2

SEM images of microstructure of as-cast new alloy: (a) X500 and (b) X1500

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Figure 3

SEM images of microstructure of heat-treated new alloy: (a) X500 and (b) X1500

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Figure 4

X-ray diffraction patterns with CuKα radiation

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Figure 5

Stress-strain curves under tensile testing

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Figure 6

Loading/unloading curves under nano-indentation testing

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Figure 7

Wear loss under ball-on-disk wear

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Figure 8

Friction coefficients under ball-on-disk wear

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Figure 9

SEM images of worn surface under ball-on-disk wear: (a) Stellite 21, (b) as-cast new alloy, and (c) heat-treated new alloy

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Figure 11

Charpy impact energy

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