Forehead quenching attempt
The end-quench by Jominy also Jominy test ( DIN EN ISO 642) is a method of testing of materials and is used for testing the hardenability of steel . The highest possible hardness is determined during quench hardening (hardening) and the progression of the hardness in depth at a certain cross-section (hardening).
course
A cylindrical steel sample of 100 millimeters in length and 25 millimeters in diameter is made by the material-dependent normalizing heated to hardening temperature, then taken within 5 seconds from the furnace and quenched at the end face from below at least 10 minutes long warm with a 20 ° C water jet.
The opposite cylinder surface is then ground flat by 0.4 to 0.5 millimeters. Starting from the edge of the quenched face, the hardness according to Rockwell (HRC) or according to Vickers (HV30 ) is gradually increased (1.5 - 3 - 5 - 7 - 9 - 11 - 13 - 15 - 20 - 25 - 30 - ... millimeters) ) measured. Alternatively, in the case of materials that do not harden strongly, the distance from the end face starts at 1 -> 2 -> 3 mm ...
The values determined decrease from a maximum of 1.5 millimeters the further one moves away from the quenched face.
