Abstract
The Auther intended to improve the properties of high grade Cast iron by the cooling and heat treatment process. The results of experiments are as follows.
1. The greatest strength of cast iron is obtained when the graphite is very fine and the matrix contains neither free cementite nor free ferrite, but is entirely pearltic. ie. Eutectic cast iron has the greatest strength.
2. Gray Cast iron when subjected to cooled relatively rapidly is obtained a structure as like as eutectic and fine graphite, but is more or less hardly.
3. So When heated 850°C for 3 hours, the cast iron has reduced hardness and produced very fine graphite and matrix of pearlite.
4. And it can be obtained high strength and toughness.
5. The authur named Taniable cast iron for the cast iron, and the composition is as follows.
C 2.5-3.0 Si 1.0-2.0 Mn 0.3-1.0 C+Si 4.0-4.5
