NDLI: Transformations during Quenching and Tempering of Hot-work Tool Steel

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Transformations during Quenching and Tempering of Hot-work Tool Steel

Content Provider	Semantic Scholar
Author	Krawczyk, Janusz
Copyright Year	2009
Abstract	The paper presents a description of phase transformation kinetics of under-cooled austenite in form of CCT diagram and kinetics of phase transformations during heating from as-quenched state in form of CHT diagram of newly implemented tool steel for hot-forging dies. The knowledge of transformations taking place during quenching and tempering of test steel will make possible to design a precise heat treatment process allowing to make of test steel a die that would be characterized by good mechanical properties and high fracture toughness. In order to determine correct quenching temperature an analysis of critical points determined on the way of dilatometric tests and on basis of so called hardening series. It was found that optimal temperature for quenching of test steel is 1050 °C. Investigated steel should be cooled at highest possible rate during quenching (higher than 5 °C/s) yet safe in order to avoid quenching cracks. On the basis of above mentioned kinetics of phase transformations during heating from as quenched state (tempering) one may match suitable tempering temperatures of test steel. Based on said above results and present knowledge investigated steel should be tempered in three stages. First is tempering at such temperature that retained austenite is destabilized. Second tempering is performed in order to obtain hardness at certain level and possibly further transformation of retained austenite and tempering the products of its transformation. Third tempering to stabilize the structure of transformations products from second tempering. Possible nitriding process, performed after heat treatment, should be carried out at the temperature lower by 30 °C from the temperature of last tempering
File Format	PDF HTM / HTML
Alternate Webpage(s)	http://konference.tanger.cz/data/metal2009/sbornik/Lists/Papers/131.pdf
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article

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