Effect of Vanadium Content on Properties of Semi-solid Gray Cast Iron Containing Vanadium for Drawing Dies

The wear resistance and thermal fatigue property of semi-solid gray cast iron samples containing vanadium for drawing dies with different contents of vanadium were tested and analyzed. The results show that with increasing vanadium content from 0 to 1.25%,the wear volume of the sample first decreased and then contained unchanged,the average depth of main crack after thermal fatigue test first decreased and then increased,while the average width of main crack first decreased and then contained unchanged. The optimized content of vanadium in the semi-solid gray cast iron was at 1%. Compared with the sample without vanadium,the wear volume of the sample with vanadium content of 1% decreased by 72%,and the average depth and width of main crack after thermal fatigue test decreased by 68% and 79%,respectively.