Metallic Materials by means of Localized Hydrogen Distribution and Nanoscopic Damage Analyses
通过局部氢分布和纳米损伤分析的金属材料
基本信息
- 批准号:12650084
- 负责人:
- 金额:$ 2.75万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (C)
- 财政年份:2000
- 资助国家:日本
- 起止时间:2000 至 2001
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Advanced metallic materials are sensitive to an environment and in order to clarify the degradation mechanisms and to improve the toughness of these metallic materials in a service environment, we must clarify the process of hydrogen entry as well as the hydrogen trap sites in the material. In this research project, thermal desorption spectroscopy of hydrogen and nanoscopic in situ observation of the process of embrittlement by means of atomic force microscopy are applied; the thermal desorption spectroscopy analyze the state of hydrogen in the material, or hydrogen trap sites, and the responsible hydrogen in the material is correlated to hydrogen embrittlement. The hydrogen evolution rate of TiAl is increased by cathodic charging, with lower temperature peaks and higher ones. The peaks at lower temperatures are correlated with hydrides decomposition and detrapping of hydrogen from microstructural imperfections such as microvoids. As received materials also shows an evolution peak at a … More higher temperature, and the evolution rate is almost independent of cathodic charging. In addition, the evolution rate at a higher temperature above 800 ℃ is increased by cathodic charging. These hydrogens are considered to have an important role on crack growth acceleration. The crack tip displacement (CTOD) of the embrittled crack is smaller than that of a fatigue crack in dry air, indicating that the embrittled crack has sharper crack than that of fatigue crack that is determined by the stress intensity factor. However the CTOD of the embrittled crack has large scatter band because the CTOD is influenced by the structure of the material and the localized hydrogen content in the material. The static SC crack grows in a steady manner in the order of urn without any retardation, when it grows along the grain boundary. However, the crack is reaching the triple grain boundary, the crack growth rate is decreasing with an increase in the CTOD. However, the crack passes over the triple grain boundary, the CTOD is decreased with an increase in the crack growth rate. When the cathodic current is applied, the crack path near the sample surface is transgranular, and the crack grows with a zigzag manner, and the crack grows with acceleration and retardation in the order of urn due to the amount of the localized hydrogen content in the material. Less
先进金属材料对环境非常敏感,为了弄清材料在服役环境中的劣化机理和提高材料的韧性,必须弄清材料中氢进入的过程和氢陷阱的位置。在本研究计划中,氢的热脱附光谱和通过原子力显微镜的脆化过程的纳米级原位观察被应用;热脱附光谱分析氢在材料中的状态,或氢陷阱位置,并且材料中的责任氢与氢脆相关。阴极充电提高了TiAl合金的析氢速率,并使析氢温度峰降低,析氢温度峰升高。在较低温度下的峰值与氢的分解和从微观结构缺陷如微孔中脱陷有关。作为接收的材料也显示出一个演变高峰, ...更多信息 较高的温度,和演变率几乎是独立的阴极充电。此外,在800 ℃以上的较高温度下,阴极充电提高了析氢速率。这些氢被认为对裂纹扩展加速有重要作用。脆化裂纹的裂纹尖端位移(CTOD)小于在干燥空气中的疲劳裂纹的CTOD,表明脆化裂纹比疲劳裂纹具有由应力强度因子决定的更尖锐的裂纹。而脆化裂纹的CTOD受材料结构和材料中局部氢含量的影响,具有较大的散射带。静态SC裂纹沿着晶界扩展时,无任何阻滞,以μ m量级稳定扩展。随着CTOD的增加,裂纹扩展速率逐渐减小,裂纹扩展到三晶界。当裂纹越过三晶界时,CTOD随裂纹扩展速率的增大而减小。当施加阴极电流时,试样表面附近的裂纹路径为穿晶型,裂纹以锯齿形方式扩展,由于材料中局部氢含量的多少,裂纹以μ m量级加速和延迟扩展。少
项目成果
期刊论文数量(18)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
箕島 弘二: "環境質制御動的応力下AFMその場観察装置の開発"日本機械学会関西支部第77期定時総会講演会講演論文集. No.024-1. 1-21-1-22 (2002)
Koji Minoshima:“开发具有环境质量控制的动态应力下的 AFM 现场观测装置”日本机械工程学会关西分会第 77 届年会论文集 No.024-1。 -22(2002年)
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- 影响因子:0
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箕島 弘二: "金属間化合物TiAlの環境助長疲労き裂進展と昇温水素分析"日本機械学会関西支部第77期定時総会講演会講演論文集. No.024-1. 8-5-8-6 (2002)
Koji Minoshima:“金属间化合物TiAl的环境辅助疲劳裂纹扩展和高温氢分析”日本机械工程师学会关西分会第77届年会论文集No.024-1。 -6 (2002)
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- 影响因子:0
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K. Minoshima, K. Obara, N. Minamino and K. Komai: "Environmental Fatigue Crack Growth in Titanium Aluminides and Hydrogen Evolution Behavior"Fatigue & Fracture of Engineering Materials and Structures. Vol.24. 803-816 (2001)
K. Minoshima、K. Obara、N. Minamino 和 K. Komai:“钛铝化物中的环境疲劳裂纹扩展和析氢行为”疲劳
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- 影响因子:0
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箕島 弘二: "金属間化合物TiAlの疲労き裂進展に及ぼす環境効果と昇温水素分析"日本機械学会M&M2001材料力学部門講演会. No.01-16. 281-282 (2001)
Koji Minoshima:“金属间化合物 TiAl 中疲劳裂纹扩展的环境影响和高温氢分析”日本机械工程师学会 M&M 2001 年材料力学分会讲座第 01-16 号(2001 年)。
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- 影响因子:0
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箕島弘二: "金属間化合物TiAlの疲労き裂進展に及ぼす環境効果と昇温水素分析"日本機械学会M&M2001材料力学部門講演会. (2001)
Koji Minoshima:“环境对 TiAl 金属间化合物中疲劳裂纹扩展的影响和高温氢分析”日本机械工程师学会 M&M 2001 年材料力学分部讲座(2001 年)。
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MINOSHIMA Kohji其他文献
MINOSHIMA Kohji的其他文献
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{{ truncateString('MINOSHIMA Kohji', 18)}}的其他基金
Development of local strain measurement technique using transmission HR-EBSD
开发使用透射 HR-EBSD 的局部应变测量技术
- 批准号:
16K14118 - 财政年份:2016
- 资助金额:
$ 2.75万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Essence of Size Effects on Strength of Metallic Nano-Films
尺寸对金属纳米薄膜强度影响的本质
- 批准号:
26220901 - 财政年份:2014
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$ 2.75万 - 项目类别:
Grant-in-Aid for Scientific Research (S)
Evaluation of large-strain plasticity of nano-films by a hybrid digital image correlation method
混合数字图像相关法评价纳米薄膜的大应变塑性
- 批准号:
25630012 - 财政年份:2013
- 资助金额:
$ 2.75万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Investigation on Fracture Mechanisms and Size Effects of Nano-Films Using Nano-Mechanical Testing System based upon in-situ Observations and Analyses
基于原位观察和分析的纳米力学测试系统研究纳米薄膜的断裂机制和尺寸效应
- 批准号:
23246026 - 财政年份:2011
- 资助金额:
$ 2.75万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Creation of Flexible Nano-Materials
柔性纳米材料的创造
- 批准号:
23656088 - 财政年份:2011
- 资助金额:
$ 2.75万 - 项目类别:
Grant-in-Aid for Challenging Exploratory Research
Investigation into the degradation mechanism of environmental embrittlement using integrated in-situ nano mechanical testing
使用集成原位纳米机械测试研究环境脆化的降解机制
- 批准号:
20360054 - 财政年份:2008
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$ 2.75万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of Mechanical and Fatigue Testing System for Micro Elements
微元件力学与疲劳测试系统的研制
- 批准号:
16360054 - 财政年份:2004
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$ 2.75万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Strength Evaluation of Single Crystal Silicon Microelements and Related Micromaterials
单晶硅微元及相关微材料的强度评价
- 批准号:
12555025 - 财政年份:2000
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$ 2.75万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Development of Genetic Algorithms based System for High-Precision Reconstructions of Three-Dimensional Topographies using Stereo Fractographs
基于遗传算法的立体断口高精度三维地形重建系统的开发
- 批准号:
10555029 - 财政年份:1998
- 资助金额:
$ 2.75万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Measurements of Localized Ion Distribution and Nanoscopic AFM Observation of Crack Initiation and Propagation of Stress Corrosion Cracking
应力腐蚀裂纹萌生和扩展的局域离子分布测量和纳米级 AFM 观察
- 批准号:
10650086 - 财政年份:1998
- 资助金额:
$ 2.75万 - 项目类别:
Grant-in-Aid for Scientific Research (C)