Abstract
A study was carried out on the effect of phosphorus content on the elevated temperature brittleness (ETB) of ferritic ductile iron. ETB indicated the marked decrease in ductility at around 673K. Testing heats containing low phosphorus content manifested ETB at temperatures between 650K and 700K. There was a consistent correlation between the fractional increase in intergranular fracture appearance and the decrease in elongation. Addition of phosphorus exceeding about 0.032% prevented ETB caused by grain boundary brittleness.
