This paper aims to compare the tribo-mechanical properties and structure–property relationships of a wear resistant cobalt-based alloy produced via two different manufacturing routes, namely sand casting and powder consolidation by hot isostatic pressing (HIPing). The alloy had a nominal wt % composition of Co–33Cr–17.5W–2.5C, which is similar to the composition of commercially available Stellite 20 alloy. The high tungsten and carbon contents provide resistance to severe abrasive and sliding wear. However, the coarse carbide structure of the cast alloy also gives rise to brittleness. Hence this research was conducted to comprehend if the carbide refinement and corresponding changes in the microstructure, caused by changing the processing route to HIPing, could provide additional merits in the tribo-mechanical performance of this alloy. The HIPed alloy possessed a much finer microstructure than the cast alloy. Both alloys had similar hardness, but the impact resistance of the HIPed alloy was an order of magnitude higher than the cast counterpart. Despite similar abrasive and sliding wear resistance of both alloys, their main wear mechanisms were different due to their different carbide morphologies. Brittle fracture of the carbides and ploughing of the matrix were the main wear mechanisms for the cast alloy, whereas ploughing and carbide pullout were the dominant wear mechanisms for the HIPed alloy. The HIPed alloy showed significant improvement in contact fatigue performance, indicating its superior impact and fatigue resistance without compromising the hardness and sliding∕abrasive wear resistance, which makes it suitable for relatively higher stress applications.
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July 2007
Technical Papers
A Comparison of the Tribo-Mechanical Properties of a Wear Resistant Cobalt-Based Alloy Produced by Different Manufacturing Processes
H. Yu,
H. Yu
School of Engineering and Physical Sciences,
Heriot-Watt University
, Edinburgh EH14 4AS, UK
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R. Ahmed,
R. Ahmed
School of Engineering and Physical Sciences,
e-mail: r.ahmed@hw.ac.uk
Heriot-Watt University
, Edinburgh EH14 4AS, UK
Search for other works by this author on:
H. de Villiers Lovelock
H. de Villiers Lovelock
Deloro Stellite
, Cheney Manor Industrial Estate, Swindon SN2 2PW, UK
Search for other works by this author on:
H. Yu
School of Engineering and Physical Sciences,
Heriot-Watt University
, Edinburgh EH14 4AS, UK
R. Ahmed
School of Engineering and Physical Sciences,
Heriot-Watt University
, Edinburgh EH14 4AS, UKe-mail: r.ahmed@hw.ac.uk
H. de Villiers Lovelock
Deloro Stellite
, Cheney Manor Industrial Estate, Swindon SN2 2PW, UKJ. Tribol. Jul 2007, 129(3): 586-594 (9 pages)
Published Online: January 9, 2007
Article history
Received:
March 15, 2006
Revised:
January 9, 2007
Citation
Yu, H., Ahmed, R., and de Villiers Lovelock, H. (January 9, 2007). "A Comparison of the Tribo-Mechanical Properties of a Wear Resistant Cobalt-Based Alloy Produced by Different Manufacturing Processes." ASME. J. Tribol. July 2007; 129(3): 586–594. https://doi.org/10.1115/1.2736450
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