What is meant by hardenability of steel?
What is meant by hardenability of steel?
The hardenability is defined as the ability of the steel to partially transform from austenite to martensite at a given depth below the end surface, when cooled under a given condition.
What is hardenability process?
One of the most important criteria in the selection process of a workpiece material is hardenability. Hardenability describes how deep a metal can be hardened upon quenching from high temperature, and can also be referred to as the depth of hardening.
Why is hardenability of steels important?
In some applications, the toughness factor rather than hardenability may dictate steel selection, but hardenability is still important because steels that can be fully quenched to 100% martensite are much tougher than those that cannot.
What increases the hardenability of steel?
Hardenability is sharply increased by manganese (most potent except boron), chromium, molybdenum and very small additions of boron (0.003 – 0.005%). Nickel and silicon have smaller effects. The hardenability is specially increased, when several alloying elements are added to steel (instead of one in large amount).
What is hardness and hardenability?
To recap: hardness is how hard the actual steel is based on the resistance of penetration. Hardenability is the potential the steel has to be hardened by thermal treatment. Each of these has tests associated to come up with a measurement that is quantifiable.
How is steel hardenability measured?
The hardenability of a ferrous alloy is measured by a Jominy test: a round metal bar of standard size (indicated in the top image) is transformed to 100% austenite through heat treatment, and is then quenched on one end with room-temperature water.
What is the difference between hardness and hardenability?
What is the difference between hardenability and hardness of a steel?
To recap: hardness is how hard the actual steel is based on the resistance of penetration. Hardenability is the potential the steel has to be hardened by thermal treatment.
How can we measure hardenability?
What factors affect hardenability?
The major factors affecting hardenability and the rate of austenite transformation are carbon content, grain size, and alloying elements.
What is hardenability and hardness?
What is difference between hardness and hardenability?