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SUMMARY:Evaluation of WC-9Co-4Cr laser surface alloyed coatings on stainle
 ss steel
DTSTART;VALUE=DATE-TIME:20110714T150000Z
DTEND;VALUE=DATE-TIME:20110714T170000Z
DTSTAMP;VALUE=DATE-TIME:20260714T154427Z
UID:indico-contribution-4985@events.saip.org.za
DESCRIPTION:Speakers: BABATUNDE OBADELE (TSHWANE UNIVERSITY OF TECHNOLOGY)
 \nIn order to examine the effect of Cr on the microstructure and hardness 
 behaviour of WC cermet\, coatings have been obtained by laser surface allo
 ying technique. WC-9Co-4Cr particulate was injected into the surface of AI
 SI 304L stainless steel under different processing variables. The morpholo
 gies and microstructures of the composite coatings were investigated using
  optical microscopy and high resolution scanning electron microscopy\, whi
 le the phase changed were observed using x-ray diffraction. The surface ha
 rdness was determined using the Vickers microhardness tester. The excessiv
 e heat from the laser beam partially melt the WC-Co which results in carbo
 n deficiency and  precipitation of carbon as graphite to form CO2 pores wi
 thin the coatings. 4% Cr has been added to compensate for the precipitatio
 n of graphite to form Cr3C2. A considerable increase in hardness value fro
 m 246 to 1331 Hv0.1 was achieved when alloying was carried out at high las
 er power and speed\, the pores being completely eliminated.\n\nhttps://eve
 nts.saip.org.za/event/7/contributions/4985/
LOCATION: Asteria
URL:https://events.saip.org.za/event/7/contributions/4985/
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