Jominy end-quench test :- Jominy end-quench test is quite simple and easy test, and is thus, almost universally employed for the determination of hardenability. For this test, a slightly oversized bar of steel is normalisad at about 66°C (≈ 150°F) above Ac 3 , and then machined to the final dimensions of 4″ (102 mm) long and 1″ (25.4 mm) diameter. Machining removes any decarburised layer formed in the normalising treatment. The machined bar is put inside a closed box, half-filled with cast iron chips to prevent decarburisation, and then austenitised for 30 minutes at about 22-23°C above Ac 3 . Standard Jominy-test specimen and fixture :- Meanwhile, the special water-quenching device is kept ready. In this device, the diameter of the pipe opening is 1/2 inch. Specimen holder is such that the bottom of the specimen remains at 1/2 inch above the nozzle. The constant pressure of the water is such that the height of the impinged jet is 2 inch. The water temperature is 75 ± 5°F. ...
Avinash Sharma (B-tech_Metallurgy) More then 10 year experience in Heat treatment and Metallurgy Lab. Knowledge of different company and products like Bajajsons ltd ( Engine parts manufacturing and rollers ) Modern steel limited ( Raw material and forging parts, Gajra Group ( transmission and crown pinion ), ARB Bearings ( All types bearings manufacturing ) Shivam autotech (Engine product)