Effects of Carbon Content on Impact Wear Performance of High Vanadium High-speed Steel

Effect of carbon content,ranging from 1.76% to 3.65%,on the impact wear performance of high vanadium high-speed steel was studied using self-designing impact wear tester WM-1.The results show that when the carbon amount is lower than 2.3%,the matrix is ferrite,so the wear resistance of the high vanadium high-speed steel is very bad and the main wear mechanism is scouring and plastic deformation.After the carbon content reached 2.3%,the matrix is martensite primarily and the impact wear resistance performance enhanced largely compared with the low-carbon high vanadium high-speed steel.When the carbon content achieved 3.0%,the wear resistance achieves peak value.With the increase of carbon content,the quantity of primarily chromium and molybdenum carbide increased while the wear resistant decreased because the crack sprout in grain boundary at where the carbides formed and the flaking is the main wear mechanism in the impact process.