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:
The Chinese nickel-base powder metallurgy (PM) superalloy FGH96, which wasprocessed through hot isostatic pressing, is very difficult to deform. FGH96 superalloy has bettersuperplasticity in special deformation conditions and superplastic isothermal forging is the bestformation method at present. The accurate constitutive equations of the FGH96 alloy was establisheddepended on the isothermal compression experiments. A two dimensional and thermomechanicalcoupled axisymmetric finite element(FE) model in which both part and die were taken inconsideration was established to fully simulate the FGH96 superalloy turbine disk superplasticisothermal forging process. Some physical parameters about the turbine disk forging process, such asload, stress field and strain field were calculated at different temperature within the forging range ofFGH96. The regularity of peak equivalent stress acted on die cavity surface, yield limit and ultimatestrength of die material during the forging process was found. Based on the regulation, peakequivalent stress acted on cavity surface must be extremely less than yield limit of die material, theoptimized processing parameter 1050°C that is the best deformation temperature for the alloy wasdetermined. That was proved better in practice and high quality disk was forged
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/16/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.551-552.297.pdf
