2020-02-28
And flake, vermicular, globular compared three kinds of graphite morphology, high temperature resistance of the spheroidal graphite cast iron is best, because the iron in the process of solidification, the flake graphite as the leading phase growth, to the end of the eutectic solidification, each branch of the eutectic graphite formation within the group of continuous stereo configuration, high temperature, when oxygen into metal internal, graphite after oxidation, forming a micro channel, accelerate the oxidation process. Spheroidal graphite nucleation, growth alone after a certain size, is surrounded by matrix, exist in isolation of the ball, oxidation on graphite ball, not form a channel, thereby reducing the further oxidation, so the high temperature oxidation resistant properties of nodular cast iron is better than other forms of graphite, and the holes on the high temperature strength of cast iron after oxidation effect is small compared to other forms of graphite, vermicular is between the two.
This paper is organized by shandong dongao aluminum parts co. LTD