Calculation of hardenability in the Jominy end quench test on the basis of the Chemical composition of steels. Calcul de la trempabilité par l’essai Jominy à partir. Jominy end-quench test P. Le Masson, P. Rogeon, D. Carron, J.J. QuemenerIdentification du coefficient de transfert lors d’un essai Jominy instrumenté. Steel — Hardenability test by end quenching (Jominy test). Acier — Essai de trempabilité par trempe en bout (essai Jominy). Provläsningsexemplar.
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The hardenability of a metal alloy is the depth to which a material is hardened after putting it through a heat treatment process. The unit of hardenability is length.
It is an indication of how deep into the material a certain hardness can be achieved. It should not be confused with hardnesswhich is a measure of a sample’s resistance to indentation or scratching.
When a hot steel work-piece is quenchedthe area in contact with the water immediately cools and its temperature equilibrates with the quenching medium.
The inner depths of the material however, do not cool so rapidly, and in work-pieces that are large, the jominny rate may be slow enough to allow the austenite to transform fully into a structure other than martensite or bainite.
This results in a work-piece jomin does not have the same crystal structure throughout its entire depth; with a softer core and harder “shell”. The hardenability of ferrous alloys, i.
The fluid used for quenching the material influences the cooling rate due to varying thermal conductivities and specific heats. Substances like brine and water cool the steel much more quickly than oil or air.
If the fluid is agitated cooling occurs even more quickly. The geometry of the part also affects the cooling rate: The hardenability of a ferrous alloy is measured by a Jominy test: The cooling rate will be highest at the end being quenched, and will decrease as distance from the end increases.
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Subsequent to cooling a flat surface is ground on the test piece and the hardenability is then found by measuring the hardness along the bar. The farther away from the quenched end that the hardness extends, the higher the hardenability. This information is plotted on a hardenability graph. The Jominy end-quench test was invented by Walter E. Jominy and A. Jominy served as president of ASM in From Wikipedia, the free encyclopedia.
Manufacturing Engineering and Technology.