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Video clips of the Jominy test procedure

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Video clip 1: Transferring the sample from furnace to quenching machine

Photograph of sample being lowered into Jominy machine

The specimen is suspended from a wire and held in a furnace to austenitise the microstructure at around 900°C. It is then carefully and quickly moved to the quenching machine and positioned above a water jet.The water jet is started and sprayed onto the bottom of the specimen until the specimen is cool.

Transferring the sample from furnace to quenching machine

Video clip 2: Quenching the sample

Photograph of water jet quenching end of sample

As the water jet sprays onto the end of the hot, glowing specimen, a cold dark region spreads up the specimen. The cold region has transformed from austenite to a mixture of martensite, ferrite and pearlite. The proportions of the phases at any position depends on the cooling rate, with more martensite formed where the cooling rate is fastest. Ferrite and pearlite are formed where the cooling rate is slower.

Quenching the sample

Video clip 3: Jominy end quench test

Photograph of sample being removed from furnace

This alternative longer video clip (contributed by Oxford Brookes University) shows both the transfer of the sample from furnace to Jominy machine, and the jet spraying one end of the sample.

Jominy end quench test


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