YANG Liushuan
,
LIU Yongchang
,
YANG Gencang
,
ZHOU Yaohe(State Key Laboratory of Solidification Processing
,
Northwestern Polytechnic University
,
Xi'an
,
710072
,
China)
金属学报(英文版)
The elevated temperature creep properties(90-150℃) of high silicon(～6wt%Si) alloy ZA27 prepared by spray deposition have been investigated by means of ball hardness testing method.The results indicate that the creep properties of the material prepared by spray deposition are notably improved,compared to that of the conventional casting alloy ZA27.The creep activation energy of the spray deposited alloy ZA27 is 3.9-5.7 kJ/mol higher than that of the conventional casting alloy ZA27.The creep formulation in this experiment is also derived as follows:HB-2-HB0-2=K exp(- Q/3RT)(t1/3-t01/3)The reasons for the improvement of creep resistance are also discussed from a microstructural point of view.
关键词:
:spray deposition
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TONG Xiaoyan ** Aircraft Engineering Department
,
Northwestern Polytechnical University
,
Xi'an
,
710072
,
China
材料科学技术（英）
Current developments on fatigue life prediction methods have been systematically reviewed.In con- sideration of the irreversibility of energy dissipation during fatigue damage process,the main contents for fatigue damage estimation and localized equivalence as well as simulation models have been established.A frame of energy-based fatigue life prediction method has been proposed,meanwhile, the procedure in application to a practical structure component has been described.
关键词:
energy dissipation
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