Increasing the Tensile Strength of Cast Iron

Following the weakness of iron castings, in 1948 the UK Case Iron Research Association formed ductile cast iron by mixing bismuth, nickel and other alloying elements in the alloy into cast iron. Since then, many iron castings have been tested to obtain better quality, one of which is the addition of magnesium to cast iron. According to the results of the metallographic examination, addition of magnesium to cast iron may produce spherical graphite. In fact, spheroidal graphite in cast iron based on laboratory tests has double tensile strength close to that of carbon steel.

The first type of iron used during the industrial revolution was cast iron, and it had strong compressibility, but weak tension. Wrought iron, on the other hand, has the same compressive strength as cast iron, but its tensile strength is also much larger. Steel is a further refined iron, stronger and better than any iron in both stretching and compression. Steel can be of varying strength, some alloys are five times more powerful than others. Engineers call these high strength steels

The industrial revolution of the 19th century produced a wrought iron truss system (an iron alloy with a very low carbon content), but it did not have a tensile strength supporting a large weight. Entering steel with higher tensile strength can replace iron and allow for larger bridges. Gustave Eiffel is one of his new ideas, first used it.

Cast iron has compressive strength. It is defined as the ability to withstand the force trying to compress or compress the material. Cast iron construction shows resistance to deformation and provides a rigid frame. However, if a part of the cast iron is very thin after being poured into the mold and the other part is very thick, the problem of structural damage becomes prominent. As with all materials, the nature of the ceramic material depends on the type of atom that is present, the type of bond between the atoms, and how atoms are stacked. In general, most ceramics are hard, abrasion-resistant, brittle, fireproof, insulation, electrical insulation, nonmagnetic, oxidation resistance, susceptible to thermal shock, and chemically stable.

Cast parts have high tensile strength, fatigue strength and creep resistance compared to forged parts, and forged parts are an important requirement in turbines when the turbine is operated at high temperature. Turbine inlet temperature is a very important parameter of engine performance and only casting products can achieve higher temperature performance. (1) Because of creep, forged parts are not used for turbine blades As can be seen from the table above, the temperature performance of forged parts is much lower than that of cast products. And when the turbine enters a temperature that is relatively higher than the temperature of the forging, the casting is preferably used to manufacture the turbine blade.