Abstract No.:
5334

 Scheduled at:
Thursday, June 08, 2017, Hall 12 10:20 AM
Automotive Industry


 Title:
The effect of microstructure and carbon contents on wear properties of arc-sprayed carbon steel coaitngs

 Authors:
Jaewon Lee* / Hanyang University, Republic of Korea
Jaeik Kim/ Hanyang University, Republic of Korea
Hansol Kwon/ Hanyang University, Republic of Korea
Changhee Lee/ Hanyang University, Republic of Korea

 Abstract:
Twin wire arc spraying process is an emerging technique for reducing weight of automobile engine by replacing heavy cast iron linear in cylinder bore. As the cylinder bore is usually exposed to harsh wear conditions, the wear resistance of the arc sprayed coatings should be able to endure the conditions. Six types of coatings were prepared for the wear test: using three different steel wires by their carbon contents (low-carbon steel, medium-carbon steel and high-carbon steel) and two different coating microstructures (porous coating and less porous coatings) for each wire. The wear behavior that depends on materials and microstructures of coatings was investigated using pin-on-disk wear machine at wide range of loads and speeds under lubricated condition. Field emission scanning electron microscope and surface profiler were used to analyze worn surfaces and calculate wear volume loss. High-carbon steel coating showed the highest wear resistance among three materials due to its high surface hardness. Porous microstructure had twofold effects on wear behavior: (1) weak bond strength between splats seemed to cause delamination wear by detaching splats under deteriorate wear condition; (2) However, the oil stored in pores appeared to help maintain lubricated condition for higher load which mitigates wear condition.

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