Multiaxial Creep-fatigue criterion of Ni-base single crystal superalloys.

镍基单晶高温合金的多轴蠕变疲劳准则。

• 批准号: 07650124
• 负责人: SAKANE Masao
• 金额: $ 1.41万
• 依托单位: RITSUMEIKAN UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1995
• 资助国家: 日本
• 起止时间: 1995 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07650124/
• 关键词: High temperature; Superalloy; Single Crystal; Multiaxial stress; Creep-fatigue; Anisotropy; Elastic constant; Crystal slip theory; 単結晶超合金; 多軸応力; 結晶塑性; 有限要素法

Tension and torsion low cycle fatigue and that with tension strain hold-time tests were carried out using CMSX-2 single crystal superalloy at 1173K.Low cycle fatigue lives in torsion were far smaller than those in tension at the same Mises equivalent strain. The difference in fatigue lives due to loading mode was attributed to the anisotropy of elastic constant. The reduction in fatigue lives by introduction of 10 min hold-time did not depend on the loading mode.Stress and strain cocnentration exists in actual gas turbine blade like air film cooling hole. Conventional elastic-plastic finite element method is not available to single crystal superalloys since single crystal superalloys have a crystallographic texture and deformation behavior is influenced by preferential slips of crystal. This study developed the finite element code available to the elastic-plastic deformation analysis of single crystal superalloys. The code takes account of cubic and octahedral slip systems. Material constants required to the analysis were determined using CMSX-4 single costal superalloy. The stress and strain concentration of a plate with a circular hole of single crystal was proved to differ that of isotropic materials.

张力和扭转低周期疲劳，并使用CMSX-2单晶超级合金在1173K处进行张力应变时测试。低循环疲劳在扭转中的生活远小于相同Mises等效菌株的紧张局势。由于加载模式而导致的疲劳生活差异归因于弹性常数的各向异性。通过引入10分钟的持有时间的疲劳寿命减少不取决于加载模式。在实际的燃气轮机刀片中，如空气膜冷却孔中存在压力和应变cocnentration。传统的弹性塑料元素方法无法用于单晶超合金，因为单晶超合金具有晶体学纹理，并且变形行为受到优先晶体滑动的影响。这项研究开发了可用于单晶超级合金的弹性变形分析的有限元代码。该代码考虑了立方和八面体滑移系统。使用CMSX-4单一costal Superaly确定分析所需的材料常数。事实证明，板的应力和应变浓度被证明是各向同性材料的不同。

项目成果

神田満: "単結晶超合金CMSX-2の高温多軸クリープ疲労" 第41期材料連合講演会. (発表予定).

Mitsuru Kanda：“单晶高温合金 CMSX-2 的高温多轴蠕变疲劳”第 41 届联合材料会议（待提交）。

神田満: "単結晶超合金CMSX-2の高温多軸クリープ疲労" 第41期材料連合講演会. (発表予定). (1997)

Mitsuru Kanda：“单晶高温合金 CMSX-2 的高温多轴蠕变疲劳”第 41 届联合材料会议（预定报告）。

坂根政男: "結晶塑性理論に基づく単結晶超合金の弾塑性解析" 第41期材料連合講演会. (発表予定). (1997)

Masao Sakane：“基于晶体塑性理论的单晶高温合金的弹塑性分析”第 41 届联盟材料会议（预定报告）（1997 年）。

M.Sakane and M.Fujikawa: "Elastic-plastic Deformation Analysis of Single Crystal Superalloy Based on Crystal Plasticity" Proceedings of 41th Japan Congress of Material Research. (to appear).

M.Sakane 和 M.Fujikawa：“基于晶体塑性的单晶高温合金弹塑性变形分析”第 41 届日本材料研究大会论文集。

M.Kanda and M.Sakane: "Multiaxial Creep-Fatigue of CMSX-2 single Crystal Superalloy at High Temperature" Proceeding of 41th Japan Congress of Material Research. (to appear).

M.Kanda 和 M.Sakane：“CMSX-2 单晶高温合金在高温下的多轴蠕变疲劳”第 41 届日本材料研究大会论文集。