What are inoculants in casting?

What are inoculants in casting?

Inoculation of cast iron is a critical processing step that can determine if a casting passes quality inspection or not. The inoculant provides nucleation sites that promote graphite precipitation and growth, together with iron solidification based on a stable Fe-C system.

What is the hardest that GREY cast iron can be?

gray irons are equally strong, or equally hard. As in steel, tensile strength and hardness are closely related. In gray irons, tensile strength ranges from about 14 MPa (20,000 psi) to more than 35 MPa (50,000 psi). The hardness of the strongest grades is double that of the weakest grades.

What is ferritic gray cast iron?

However, in grey cast irons, if the cooling rate through the eutectoid temperature is sufficiently slow, then a completely ferritic matrix is obtained with the excess carbon being deposited on the already existing graphite. White cast irons are hard and brittle; they cannot easily be machined.

What can GREY cast iron be used for?

It is the most common cast iron and the most widely used cast material based on weight. It is used for housings where the stiffness of the component is more important than its tensile strength, such as internal combustion engine cylinder blocks, pump housings, valve bodies, electrical boxes, and decorative castings.

What is the purpose of inoculant?

Inoculation may be defined as the process of adding effective bacteria to the host plant seed before planting. The purpose of inoculation is to make sure that there is enough of the correct type of bacteria present in the soil so that a successful legume-bacterial symbiosis is established.

What is the purpose of inoculation?

Growers know to achieve this goal, the process must start with the seed, and that means inoculation. Inoculation is a farming practice that helps growers give their crops a productive start to the season, improving plant vigor and return-per-acre potential each year.

What is the reason of low toughness of GREY cast iron?

Explanation: Grey cast iron has very poor toughness. Its major reason is notch like an effect of graphite flakes. These flakes increase stress concentration in it lowering toughness.

Why GREY cast iron is brittle and weak in tension?

Gray cast irons are comparatively weak and brittle in tension due to its microstructure; the graphite flakes have tips which serve as points of stress concentration. Strength and ductility are much higher under compression loads.

What is reason of low toughness of GREY cast iron?

Can you use too much inoculant?

Contains live bacteria that are essential in the nitrogen fixating process of legumes. Also increasing the amount of bacteria results in more nitrogen fixing. That’s why you can never apply too much legume inoculant. The more you use, the better it works.

How long is inoculant good for?

An inoculant should be bought fresh each year for maximum viability. Inoculants should be kept completely away from direct sunlight, and are best stored at temperatures from 40 to 77 degrees Fahrenheit. Do not freeze the product. Once a package has been opened, use it within 24 hours.

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