Microstructural investigation of D2 tool steel during rapid solidification

Autor:	P. Delshad Khatibi, Andre Phillion, Hani Henein
Rok vydání:	2013
Předmět:	Austenite Supersaturation Materials science Scanning electron microscope Metallurgy Metals and Alloys Nucleation Recalescence engineering.material Condensed Matter Physics Mechanics of Materials Tool steel Materials Chemistry Ceramics and Composites engineering Supercooling Eutectic system
Zdroj:	Powder Metallurgy. 57:70-78
ISSN:	1743-2901 0032-5899
DOI:	10.1179/1743290113y.0000000072
Popis:	Impulse atomisation in helium and nitrogen and water atomisation have been utilised to produce powders of D2 tool steel. It was determined that higher cooling rates result in a lower percentage of eutectic. Scanning electron microscopy image analysis, along with coarsening model, was used to predict eutectic and primary phase undercooling of particles. Small particles exhibited a higher amount of undercooling. The particles exposed to a He atmosphere during atomisation had a larger amount of eutectic undercooling. The fraction of primary phase that solidified during the recalescence was then calculated based on the amount of primary phase undercooling under adiabatic conditions. In smaller particles, there was a larger amount of primary phase solidified during recalescence due to a higher amount of primary undercooling. Based on primary phase undercooling values, critical nuclei radius of austenite and assuming homogenous nucleation, the number of austenite unit cells in the stable nucleus was calculated.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e69f66f9b61b8a75a9010b4d072a5044 https://doi.org/10.1179/1743290113y.0000000072 Zobrazit plný text záznamu