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Clarification of the initial damage mechanism of Ni-based superalloy under creep-fatigue loading at elevated temperature

阐明高温蠕变疲劳载荷下镍基高温合金的初始损伤机制

基本信息

批准号：
20J12222
负责人：
羅軼凡
金额：
$ 1.15万
依托单位：
Tohoku University
依托单位国家：
日本
项目类别：
Grant-in-Aid for JSPS Fellows
财政年份：
2020
资助国家：
日本
起止时间：
2020-04-24 至 2022-03-31
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20J12222/
关键词：
creep creep-fatigue crack initiation diffusion Arrhenius formula creep-fatigue damage intergranular crack dislocations and voids internal stress

项目摘要

In last year's research, an important drawback of our previously proposed stress-induced acceleration of atom diffusion (modified Arrhenius equation) was found, namely the difficulty in quantitatively estimating the stress at the crack initiation region, at least with our existing experimental methods. Difficult to estimate even on ambiguous scales. The reasons are very complicated. First, it is difficult to define its influence range. Second, it is difficult to quantitatively distinguish between the stress concentration caused by external load and the stress concentration caused by lattice mismatch at the grain boundary. Third, each grain has its own uniqueness, that is, the uniqueness of its orientation and the way it combines with adjacent crystals. In addition, in the materials with smaller crystal diameters, it is difficult to compare the crystal parameters of the same set of adjacent crystals multiple times by conducting intermittent creep for creep-fatigue test due to oxidation during each loading process and subsequent polishing losses. Currently, our group are trying to use strain instead of stress as the influencing parameter of the modified Arrhenius formula. Some progress on the quantitative evaluation of creep crack initiation of SUS316 material has been achieved, and in future studies, we may consider extending it to other material to verify the feasibility of this idea.

在去年的研究中，发现了我们先前提出的应力诱导原子扩散加速（修正的Arkidius方程）的一个重要缺点，即难以定量估计裂纹萌生区的应力，至少用我们现有的实验方法是这样。即使在模糊的尺度上也难以估计。原因很复杂。一是难以界定其影响范围。其次，难以定量区分由外部载荷引起的应力集中和由晶界处的晶格失配引起的应力集中。第三，每个晶粒都有其独特性，即其取向和与相邻晶体结合方式的独特性。此外，在具有较小晶体直径的材料中，由于在每次加载过程中的氧化和随后的抛光损失，难以通过进行用于蠕变疲劳测试的间歇蠕变多次比较同一组相邻晶体的晶体参数。目前，本课题组正在尝试用应变代替应力作为修正的阿氏公式的影响参数。在SUS316材料蠕变裂纹萌生的定量评价方面取得了一定的进展，在今后的研究中，可以考虑将其推广到其他材料，以验证这一思路的可行性。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Quantitative Evaluation of the Dominant Factors of Intergranular Cracking of Ni-Base Superalloys Under Creep-Fatigue Loadings at Elevated Temperature

高温蠕变疲劳载荷下镍基高温合金晶间裂纹主导因素的定量评价

DOI：
发表时间：
2020
期刊：
影响因子：
0
作者：
福田陽子;片岡龍峰;内田陽仁;三好由純;加藤雄人;塩川和夫,　海老原祐輔;Hampton Donald;岩上直幹;関華奈子;Yifan Luo
通讯作者：
Yifan Luo

Acceleration of Grain Boundary Cracking in Ni-Base Alloy 617 Under Creep-Fatigue Loading at 800°C

800°C 蠕变疲劳载荷下镍基合金 617 的晶界开裂加速

DOI：
10.1115/imece2020-23738
发表时间：
2020
期刊：
International Conference on Theoretical, Applied and Experimental Mechanics, proceeding
影响因子：
0
作者：
Ishihara Kenta;Luo Yifan;Miura Hideo
通讯作者：
Miura Hideo

Degradation of the Strength of a Grain Boundary of Ni-Base Superalloys Under Creep-Fatigue Loading at Elevated Temperature

高温蠕变疲劳载荷下镍基高温合金晶界强度的退化

DOI：
10.1115/imece2020-24473
发表时间：
2020
期刊：
International Conference on Theoretical, Applied and Experimental Mechanics, proceeding
影响因子：
0
作者：
Takahashi Yukako;Luo Yifan;Ishihara Kenta;Suzuki Shujiro;Miura Hideo
通讯作者：
Miura Hideo

Crystallinity Dependence of Grain and Grain Boundary Strength of a Bicrystal Structure of Copper

铜双晶结构的晶粒和晶界强度的结晶度依赖性

DOI：
10.1115/imece2020-23757
发表时间：
2020
期刊：
International Conference on Theoretical, Applied and Experimental Mechanics, proceeding
影响因子：
0
作者：
Suzuki Ken;Fan Yiqing;Luo Yifan
通讯作者：
Luo Yifan

Creep-Fatigue Damage of Heat-Resistant Alloys Caused by the Local Lattice Mismatch-Induced Acceleration of the Generation and Accumulation of Dislocations and Vacancies

局部晶格失配加速位错和空位的产生和积累引起的耐热合金蠕变疲劳损伤