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IJSTR >> Volume 5 - Issue 12, December 2016 Edition

International Journal of Scientific & Technology Research  
International Journal of Scientific & Technology Research

Website: http://www.ijstr.org

ISSN 2277-8616

Influence Of The Triple Spheroidization On Surface Hardness From Drilling Resistance Behavior Of Powder Coated Gray Cast Iron

[Full Text]



Subhakij Khaonetr



Triple spheroidization, Surface hardness, Drilling resistance behavior, Powder coated gray cast iron



The objective of this study on the influence of the triple spheroidization on surface hardness from drilling resistance (Dry drilling) of powder coated gray cast iron using universal testing machine (Compressive mode), the surface hardness in powder coating areas, normal hardness and Charpy impact resistance were considered. The spheroidizing temperatures were 300C, 450C and 600C; the spheroidizing time spanned the range of 6 hours and cooled down in the furnace to room temperature for 24 hours. The drilling resistance test; the high-speed twist drill diameter of 3 mm, the rotating speed of 1000 rev/min, and the crosshead speed of 5-25 mm/min were investigated. It was found that the surface hardness from drilling resistance, normal hardness and Charpy impact resistance increased as the spheroidizing temperatures increased. The maximum surface hardness was found at the third spheroidization.



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