ISSN:
1013-9826
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:
Recrystallization and grain growth behavior of alloy 718 casting were investigated toobtain homogeneous microstructure during hot forging. For this purpose, compression tests werecarried out for cylindrical specimens at the temperature range of 1000 to 1150℃ and the strain rate of10-1 and 10sec-1. The dynamic recrystallization behavior caused by the hot compression wasinvestigated in terms of the recrystallized area fraction and average grain size. Reheating wasfollowed to the hot compressed samples at the temperature range of 1050 to 1150℃ for 100, 600 and1800sec, and the static recrystallization behavior caused by the reheating was also investigated. Ashot deformation temperature increased from 1000 to 1150℃, both the area fraction and average grainsize of dynamically recrystallized grains increased. When higher strain rate of 10 sec-1 was used, thearea fraction of dynamically recrystallized grains increased substantially, but the average grain sizewas not affected. When reheating the hot compressed samples at 1050℃ for 100, 600 and 1800sec,respectively, microstructural change including grain growth was not noticed. On the other hand, whenreheating the samples at higher temperatures, 1100℃ and 1150℃, both the area fraction and theaverage grain size of the statically recrystallized grains increased considerably as the holding timeincreased from 100 to 1800sec
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/54/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.345-346.57.pdf
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