High Temperature Multiaxial Creep-Fatigue and Consitutive Equation for Ni-Base Single Crystal Superalloy

镍基单晶高温合金高温多轴蠕变疲劳及本构方程

• 批准号: 03650067
• 负责人: SAKANE Masao
• 金额: $ 1.34万
• 依托单位: Ritsumeikan University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1991
• 资助国家: 日本
• 起止时间: 1991 至 1992
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-03650067/
• 关键词: Multiaxial stress; Low cycle fatigue; High temperature; Slip theory; Superalloy; Single crystal; Constitutive equation; Yield surface; 降伏曲面; 一方向凝固超合金; 多軸低サイクル疲労; 結晶方向

Combined tension-torsion multiaxial low-cycle fatigue (LCF) tests were carried out using Mar-M247LC directionally solidified (DS) and CMSC-2 single crystal (SC) superalloys. Several multiaxial strain and stress parameters were applied to the experimental data. A new constitutive equation wad developed based on the slip theory, taking account of the anisotropy of elastic constants. The main conclusions obtained are as follows.(1)The conventional multiaxial low cycle fatigue strain parameters, such as Mises equivalent strain, maximum principal strain, maximum shear strain and equivalent strain based on crack opening displacement (COD), could not correlate the multiaxial LCF data of the DS and SC superalloys.(2)This research developed a new COD strain parameter taking account of the anisotropy of the elastic constant. The COD strain correlates the multiaxial low cycle fatigue data of DS and SC superalloys within a small scatter band.(3)LCF fatigue data were correlated by Miss equivalent stress, maximum principal stress, maximum shear strain and COD strain. Mises and COD strain correlated the multiaxial LCF parameter with a small scatter, but the other stress parameters give a large scatter of the data.(4)A new consititutive equation wad developed based on the slip theory and anisotropy of elastic constants. The developed constitutive equation accurately estimates the cyclic stress-strain relation of DS and SC superalloys at elevated temperature.

采用MAR-M247LC定向凝固(DS)和CMSC-2单晶(SC)高温合金进行了拉扭多轴低周疲劳试验。实验数据采用了几个多轴应变和应力参数。在滑移理论的基础上，考虑弹性常数的各向异性，建立了新的本构方程。得到的主要结论如下：(1)常规的多轴低周疲劳应变参数，如Mise等效应变、最大主应变、最大剪切应变和基于裂纹张开位移的等效应变等不能关联DS和Sc高温合金的多轴低周疲劳应变数据。(2)考虑了弹性常数的各向异性，提出了一种新的COD应变参数。在一个较小的分散带内，用COD应变关联了DS和Sc高温合金的多轴低周疲劳数据。(3)用未命中等效应力、最大主应力、最大剪切应变和COD应变关联了低周疲劳数据。MISES和COD应变使多轴LCF参数具有较小的离散性，而其他应力参数使数据具有较大的离散性。(4)基于滑移理论和弹性常数的各向异性，建立了新的本构方程。建立的本构方程准确地估计了DS和Sc高温合金的高温循环应力-应变关系。

项目成果

長谷部 忠司: "NC基単結晶超合金の非弾性変形と降伏曲面" 日本材料学会第30回高温強度シンポジウム前刷集. 69-73 (1992)

Tadashi Hasebe：“NC基单晶高温合金的非弹性变形和屈服面”第30届高温强度研讨会论文集，日本材料学会，69-73（1992）

神田 満: "Ni基単結晶超合金CMSX-2の高温多軸低サイクル疲労" 日本材料学会第42期学術講演会前刷. (1993)

Mitsuru Kanda：“镍基单晶高温合金CMSX-2的高温多轴低周疲劳”日本材料学会第42届学术会议预印本（1993）。

Kenji Shimomizuki: "Multiaxial Low Cycle Fatigue of Mar-M247LC Ni-base Directionally Solidified Superalloy" Proc.29th Symposium on Strength of Materials at High Temperature, JSMS. 21-25 (1991)

Kenji Shimomizuki：“Mar-M247LC 镍基定向凝固高温合金的多轴低周疲劳”Proc.29th 高温材料强度研讨会，JSMS。

MASAO SAKANE: "Multiaxial Low Cycle Fatigue of Mar-M247LC DS Superalloy at Elevated Temperafure" Third International Conference on Low Cycle Fatigue and Elasto-plastic Bahavior of Materials. (1992)

MASAO SAKANE：“Mar-M247LC DS 高温合金在高温下的多轴低周疲劳”第三届材料低周疲劳和弹塑性行为国际会议。

白藤 中生: "NC基一方向凝固超合金の高温多軸低サイクル疲労" 日本材料学会第40期学術講演会前刷. 216-218 (1991)

Nakao Shirafuji：“NC基单向凝固高温合金的高温多轴低周疲劳”，日本材料学会第40届学术会议预印本216-218（1991）。