Abstract: In situ high temperature metalloscopic observation was made of deformation and fracture for superalloy GH169 under combined action of fatigue and creep. The mode of deformation is revealed as slipping, twinning and grain boundary sliding. The mode of failure is dependent upon microstructure. The intergranular cracks arise from W-type voids produced by strees concentration at triple point which would not be relaxed by interior deformation of grains and local deformed region along grain boundaries, and its propagation mechanism is nucleation, growth and linkage of cavities at grain boundaries. Tranagranular cracks result from deformation damage of grain, and its propagation mechanism is shear rupture along slip plane.
田长生;王明升;侯铁翠;党新安. 疲劳/蠕变复合作用下GH169合金变形和断裂过程的动态观察[J]. 金属学报, 1992, 28(9): 35-41.
TIAN Changsheng; WANG Minsheng; HOU Tiecui DAN Xin'an (Northwestern Polytechnical University; Xi'an). IN SITU OBSERVATION OF DEFORMATION AND FRACTURE FOR SUPERALLOY GH169 UNDER COMBINED FATIGUE-CREEP ACTION. Acta Metall Sin, 1992, 28(9): 35-41.
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