Estimation of the lifetime of nickel base turbine blades by using elastic strain measurement

利用弹性应变测量估算镍基涡轮叶片的寿命

• 批准号: 15360369
• 负责人: TANAKA Katsushi
• 金额: $ 8.64万
• 依托单位: KYOTO UNIVERSITY (2005-2006)Kagawa University (2003-2004)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15360369/
• 关键词: superalloy; creep deformation; raft structure; phase stability; elastic constants; elastic strain energy; 弾性緩和; 非破壊検査; ラフト組織; 異方的弾性歪

Development of elastic strain in nickel base super alloy during creep deformation has been investigated. The results show that the change in elastic strain is owing to stack creep dislocations at gamma gamma-prime interfaces. Theoretical calculations about the stability of microstructure indicate that the raft structure is stabilized by a small amount of creep dislocations, however, the raft structure is destabilized by a large amount of creep dislocations. The critical amount of creep dislocations agrees with that for perfectly accommodate the lattice misfit between gamma and gamma-prime phases. In the destabilized raft structure, the most stable lamellar plane normal is not the [001] direction but that tilted toward the <111> direction. This is the reason why the raft structure collapses during the creep deformation. The measurement of elastic strain is useful to detect an early stage of creep deformation, however, the measurement is less sensitive to the change occurred in a later stage of its lifetime.

研究了镍基高温合金在蠕变变形过程中弹性应变的发展。结果表明，弹性应变的变化是由于γ-γ-界面处的堆蠕变位错造成的。微观结构稳定性的理论计算表明，少量蠕变位错可使筏结构稳定，但大量蠕变位错会使筏结构失稳。蠕变位错的临界量与完美适应伽马相和伽马相之间的晶格失配的临界量一致。在失稳筏结构中，最稳定的层状面法线不是[001]方向，而是向<111>方向倾斜。这就是筏板结构在蠕变变形过程中倒塌的原因。弹性应变的测量对于检测蠕变变形的早期阶段非常有用，但是，该测量对其寿命后期发生的变化不太敏感。

项目成果

Stability of the raft structure from a view point of elastic/plastic theory and its application to estimate the lifetime of turbine blades

从弹塑性理论角度看筏结构的稳定性及其在涡轮叶片寿命估算中的应用

• 发表时间: 2007
• 作者: K.Tanaka; T.Inoue; K.Kishida; H.Inui
• 通讯作者: H.Inui

Mechanism of collapsing the raft structure in nickel base superalloys

镍基高温合金筏板结构塌陷机理

• 发表时间: 2005
• 作者: K.Tanaka; T.Ichitsubo; K.Kishida; H.Inui
• 通讯作者: H.Inui

Interpretation in elastic regime for rafting of Ni-base superalloy based on the external-stress-free dimensional change due to internal-stress equilibration

基于内应力平衡引起的无外应力尺寸变化的镍基高温合金漂流弹性状态解释

• 发表时间: 2005
• 作者: T.Ichitsubo; K.Tanaka
• 通讯作者: K.Tanaka

The broadening of Crystallographic Orientation Distribution in Crept Ni-Base Superalloys

蠕变镍基高温合金晶体取向分布的拓宽

• 发表时间: 2007
• 作者: T.Inoue; K.Tanaka; H.Adachi; K.Kishida; H.Inui
• 通讯作者: H.Inui

Change in the Stability of Raft Structure in Nickel Base Superalloys During Creep Deformation

镍基高温合金筏结构蠕变变形稳定性的变化

• 发表时间: 2006
• 作者: K.Tanaka; T.Ichitsubo; K.Kishida; H.Inui
• 通讯作者: H.Inui