Examinations at the material 1.3505

 

The test series should clarify the influence of the quenching temperature on the microstructure and on the martensite formation as well as possible defects. The examined material was 100Cr6.
Initial condition : hot rolled 16,00 mm , spheroidised
Heat treatment : laboratory furnace (volume 5 liter) ; soaking of the samples in 5 minutes
Hardening : 860 and 1000° C , holding time 30 minutes , quenching in oil

By the quenching from temperatures high above the right quenching temperature almost all carbides of the initial structure are going in solution . Through this, it comes intensified too high amounts of retained austenite in the microstructure. By excessive tensions in the microstructure, stress cracks, going out from the surface, are frequently the consequence. Microcracks in the first formed martensite needles also have to be observed at high temperatures. 

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