What is Jominy value?
The Jominy end-quench test is used to measure the hardenability of a steel, which is a measure of the capacity of the steel to harden in depth under a given set of conditions.
How do you calculate hardenability?
Hardenability is then determined by measuring the hardness along the bar in 1.6 mm (1/16 in.) steps, and it can be surmised that the farther away from the quenched end the hardness extends, the higher the hardenability for the alloy under study.
Is hardenability the same as hardness?
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.
What is quench severity?
The severity of a quench refers to how quickly heat can be drawn out of a part. Different quenching media have different degrees of severity. Caustics are the most severe quenchants, followed by oils, then salts and, finally, gases.
What is the Jominy test used for?
The Jominy end quench test is used to measure the hardenability of a steel, which is a measure of the capacity of the steel to harden in depth under a given set of conditions.
What does a Jominy test do?
The Jominy test provides a measure of the ability of a steel to harden by transforming into martensite under set conditions, i.e., a measure of the hardenability of the steel.
What is the Jominy end quench test?
The Jominy end quench test is used to measure the hardenability of a steel, which is a measure of the capacity of the steel to harden in depth under a given set of conditions. The Jominy end quench test is the standard method for measuring the hardenability of steels.
What is critical rate of quenching?
To get the best properties, we must quench the steel past the nose of the C-curve. The cooling rate that just misses the nose is called the critical cooling rate (CCR). If we cool at the critical rate, or faster, the steel will transform to 100% martensite.
What is the fastest quenching medium?
Oil. Oil is able to quench heated metals much more rapidly than compressed air. To quench with oil, a heated part is lowered into a tank that is filled with some type of oil.