Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/16430
Title: Dynamic recrystallization of the hot isostatically pressed P/M superalloy FGH4096 in hot working process
Authors: Ning, Y
Yao, Z
Fu, MW 
Guo, H
Keywords: Dynamic recrystallization (DRX)
Grain size
Necklace microstructure
Nucleation
P/M superalloy FGH4096
Repeated DRX
Issue Date: 2010
Publisher: Elsevier
Source: Materials science and engineering. A, Structural materials : properties, microstructure and processing, 2010, v. 527, no. 26, p. 6968-6974 How to cite?
Journal: Materials science and engineering. A, Structural materials : properties, microstructure and processing 
Abstract: The dynamic recrystallization (DRX) of the hot isostatically pressed P/M superalloy FGH4096 in isothermal working process was characterized and investigated by using optical microscope (OM) and transmission electron microscope (TEM) techniques. The P/M superalloy was first prepared by hot isostatically pressing. The isothermal compression tests of the P/M superalloy were then conducted in a Gleeble-1500D simulator at the temperature ranging from 1080 to 1140°C and the strain rate from 0.02 to 1.0s-1. The microstructure observation of the deformed samples showed that the necklace microstructure was obtained under the strain of 0.51 or below. The necklace microstructure is an intermediate microstructure for the complete recrystallized microstructure, which could be finally generated when the strain was about 0.69. In addition, it was found that the complete recrystallized grain quantity was increased with the increase of temperature and the decrease of strain rate. The DRX nucleation sites are classified into three regions, viz., (i) previous particle boundaries (PPBs), (ii) recrystallized grain boundaries, and (iii) twin sources. As the repeated DRX took place, the grain size was eventually refined from 30.0 to 4.0μm after the multiaxially forging and the homogeneous bulk billet with fine DRX grains was finally obtained.
URI: http://hdl.handle.net/10397/16430
ISSN: 0921-5093
EISSN: 1873-4936
DOI: 10.1016/j.msea.2010.07.018
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