TY - GEN
T1 - Finite element simulation of superplastic isothermal forging process for nickel-base PM superalloy
AU - Li, Q. H.
AU - Li, F. G.
AU - Wan, Q.
AU - Li, M. Q.
PY - 2007
Y1 - 2007
N2 - The Chinese nickel-base powder metallurgy (PM) superalloy FGH96, which was processed through hot isostatic pressing, is very difficult to deform. FGH96 superalloy has better superplasticity in special deformation conditions and superplastic isothermal forging is the best formation method at present. The accurate constitutive equations of the FGH96 alloy was established depended on the isothermal compression experiments. A two dimensional and thermomechanical coupled axisymmetric finite element(FE) model in which both part and die were taken in consideration was established to fully simulate the FGH96 superalloy turbine disk superplastic isothermal forging process. Some physical parameters about the turbine disk forging process, such as load, stress field and strain field were calculated at different temperature within the forging range of FGH96. The regularity of peak equivalent stress acted on die cavity surface, yield limit and ultimate strength of die material during the forging process was found. Based on the regulation, peak equivalent stress acted on cavity surface must be extremely less than yield limit of die material, the optimized processing parameter 1050°C that is the best deformation temperature for the alloy was determined. That was proved better in practice and high quality disk was forged.
AB - The Chinese nickel-base powder metallurgy (PM) superalloy FGH96, which was processed through hot isostatic pressing, is very difficult to deform. FGH96 superalloy has better superplasticity in special deformation conditions and superplastic isothermal forging is the best formation method at present. The accurate constitutive equations of the FGH96 alloy was established depended on the isothermal compression experiments. A two dimensional and thermomechanical coupled axisymmetric finite element(FE) model in which both part and die were taken in consideration was established to fully simulate the FGH96 superalloy turbine disk superplastic isothermal forging process. Some physical parameters about the turbine disk forging process, such as load, stress field and strain field were calculated at different temperature within the forging range of FGH96. The regularity of peak equivalent stress acted on die cavity surface, yield limit and ultimate strength of die material during the forging process was found. Based on the regulation, peak equivalent stress acted on cavity surface must be extremely less than yield limit of die material, the optimized processing parameter 1050°C that is the best deformation temperature for the alloy was determined. That was proved better in practice and high quality disk was forged.
KW - FEM(finite element method)
KW - Nickel-base PM superalloy FGH96
KW - Superplastic isothermal forging
UR - http://www.scopus.com/inward/record.url?scp=38449097806&partnerID=8YFLogxK
U2 - 10.4028/0-87849-435-9.297
DO - 10.4028/0-87849-435-9.297
M3 - 会议稿件
AN - SCOPUS:38449097806
SN - 0878494359
SN - 9780878494354
T3 - Materials Science Forum
SP - 297
EP - 302
BT - Superplasticity in Advanced Materials - ICSAM 2006 - Proceedings of the 9th International Conference on Superplasticity in Advanced Materials
PB - Trans Tech Publications Ltd
T2 - 9th International Conference on Superplasticity in Advanced Materials, ICSAM 2006
Y2 - 23 June 2006 through 26 June 2006
ER -