Effects of carbon and titanium on the solidification structure and properties of ferrite heat-resistant alloy

In order to design a low-cost high temperature ferrite alloy, the effects of carbon, and titanium on its solidification structure and properties have been studied. When the carbon content is increased from 0.07 to 0.35 wt%, the alloy grains becomes finer, and the grain boundaries become wider and more zigzag. The alloy oxidation weight-gain rate at 1300°C keeps increasing clearly, however, that at 1350°C decreases at first then increases. When the carbon content is above 0.15 wt% the alloy strength at 1300°C decreases acutely. When the titanium content increased from 0.30 to 0.60 wt%, the alloy grains became fine, and both the alloy strength and oxidation resistance improved remarkably.