S.M.Seo
,
I.S.Kim
,
J.H.Lee
,
C.Y.Jo
,
H.Miyahara
,
K.Ogi
材料科学技术（英）
Microstructural evolution during directional solidification (DS) of Ni-base superalloy IN792+Hf has been investigated with an emphasis on the γ′ precipitates and MC-type carbides. The quantitative image analyses revealed that the increase in the solidification rate up to 100 μm/s at constant thermal gradient of 178 K/cm resulted in a fine and uniform distribution of γ′ precipitates. The relationship between the as-cast γ′ size and cooling rate was also determined for DS IN792+Hf. In the mean time, the MC carbide size was found to be dependent both on the solidification rate and the S/L interface morphology while the area fraction of MC carbide was significantly influenced by the S/L interface morphology.
关键词:
IN792
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null
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null
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null
I.G.Kim
,
I.S.Kim
金属学报(英文版)
Quasi-isotropic laminates have isotropic elastic properties in all yn-plane directions.Therefore,this kind of laminate is widely used for structural elements.The simplest stacking sequence of quasi-isotropic laminates is[0/-60/60]s.When the direction of applied axial lood to[0/-60/60]s laminate is inclined at a 30-degree angle,we have the other quasi-isotropic laminate [30/-30/90]s under axial load.The failure mecha-nisms of these two lamibnates are,however,entirely different from each other because these two laminates have different distribution of the interlaminar stresses.It was confirmed by tensile fatigue tests that the [0/-60/60]s laminate does not show any vis-ible fatigue damage,but the[30/-30/90]s laminate develops edge-delamination
关键词:
composite
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null
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