ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Using modifications to the Rappaz-Drezet-Gremaud hot tearing model, and usingempirical equations developed for grain size and dendrite arm spacing (DAS) on the addition ofgrain refiner for a range of cooling rates, the effect of grain refinement and cooling rate on hottearing susceptibility has been analysed. It was found that grain refinement decreased the grain sizeand made the grain morphology more globular. Therefore refining the grain size of an equiaxeddendritic grain decreased the hot tearing susceptibility. However, when the alloy was grain refinedsuch that globular grain morphologies where obtained, further grain refinement increased the hottearing susceptibility. Increasing the cooling decreased the grain size and made the grainmorphology more dendritic and therefore increased the likelihood of hot tearing. The effect wasparticularly strong for equiaxed dendritic grain morphologies; hence grain refinement isincreasingly important at high cooling rates to obtain more globular grain morphologies to reducethe hot tearing susceptibility
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.519-521.1675.pdf
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