Abstract
Using carbon steel and hyper-eutectoid special steels containing 1 and 2% of Si, Ni, Cr, Cu, Mn, Al, Mo, Co, V and W individually, effect of these special elementa on spheroidizing of carbides in these steels by tempering after quenching was studied.
Specimens quenched in water and in oil at complete austenite region were tempered at 600, 640, 680 and 720° for 20hrs, and the rate of spheroidizing of carbides was measured by means of Rockwell hardeness tester. In steels containing some elements which do not form special carbides spheroidizing of them easily proceeds, but in steels containing another elements which form them the rate of it is slow. Quenching condition of steels, such as in water or in oil, do not effect on the spheroidizing of carbides by tempering, and undissolved carbides in austenite at quenching temperature also do not effect.
