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What is the ideal critical diameter and can it be determined with a jominy test?
Wiki User
∙ 14y ago
The Jominy Test involves heating a test piece from the steel (25mm diameter and 100mm long) to an austenitising temperature and quenching from one end with a controlled and standardised jet of water.
Take a sample from the furnace and place it on the Jominy test fixtures and observe the cooling pattern.
After quenching the hardness profile is measured at intervals from the quenched end after the surface has been ground back to remove any effects of decarburisation (0.38mm is removed from the surface).
The hardness variation along the test surface is a result of microstructural variation which arises since the cooling rate decreases with distance from the quenched end. The cooling rate along the Jominy test specimen varies from about 225 °C s-1 to 2 °C s-1.
Wiki User
∙ 14y ago
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