Study on Improvement of Fatigue Strength Reliability in Machine and Structure by Laser Peening Treatment

激光喷丸处理提高机械结构疲劳强度可靠性的研究

• 批准号: 18560073
• 负责人: OCHI Yasuo
• 金额: $ 2.41万
• 依托单位: The University of Electro-Communications
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560073/
• 关键词: Laser peening treatment; Fatigue strength reliability; Fatgiue crack propagation control; Machine and structural materials; Micro computed tomography (μCT); Crack profile obserbation; Compressive residual stress; Strain hardeing layer; レーザビーニング処理

It is useful for the reducing of weight, energy, materials and the high efficiency to improve the fatigue strength reliability of machines and structures by giving high functional property. In the present research, the laser peening (LP) treatment is performed on machines and structural materials, and it is the porpose of the research to improve the fatigue strength reliability in the materials and to make clear the mechanism of the improvement The laser treatment of low energy YAG laser without protective coating is wsasused in water The materials used in the research a were austenitic stainless steels for nuclear plant structures, cast aluminum alloy for automobile parts and high strength tool steels.The main conclusions obtained in the research are as followings1. In all of the materials used in the research, it is confirmed to improve the fatigue strength by the LP treatment. And it is clear that the improvement effects were induced from compressive residual stress and the strain hardening in the surface layer of materials by the LP treatment.2. The restrained effects for fatigue crack propagation process were confirmed for the pre-cracked materials by the LP treatment And, the effects were induced from the compressive residual stress and the crack closure effect by plastic deformation near crack tip by the LP treatment.3.By the micro computed tomographic (μ CT) imaging technology with syncroton radiation equipment, surface fatigue cracks were successfully visualized non-destructively and three-dimensionally.

它可用于减少体重，能量，材料和高效率，可通过赋予高功能性能来提高机器和结构的疲劳强度可靠性。在本研究中，对机器和结构材料进行了激光涂料（LP）处理，这是提高材料中疲劳强度可靠性的研究，并明确了改进的材料的低能量yag激光器的激光处理机制，而无需保护材料，用于研究材料，用于研究材料。汽车零件和高强度工具钢。研究中获得的主要结论如下1。在研究中使用的所有材料中，可以通过LP处理来提高疲劳强度。很明显，通过LP处理，材料表面层的应力硬应力和应变硬化引起了改善效应。2。通过LP处理证实了疲劳裂纹传播过程的约束作用，并通过LP处理通过压缩残留应力和裂纹变形在裂纹尖端附近造成裂纹闭合效果。

项目成果

Effects of laser peening treatment on high cycle fatigue properties of degassing-processed cast aluminum alloy

• DOI: 10.1016/j.msea.2006.09.126
• 发表时间: 2007-11
• 期刊: Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
• 影响因子: 6.4
• 作者: K. Masaki;Y. Ochi;T. Matsumura;Y. Sano

Fatigue Strength Improvement by peening Treatment in Degassing Processed Cast Aluminum Alloys

通过脱气处理铸造铝合金的喷丸处理提高疲劳强度

• 发表时间: 2006
• 期刊: International Journal of Modern Physics B 20・25,26,27
• 作者: Y.Ochi;K.Masaki;T.Matsumura;Y.Kumagai;T.Hamaguchi;Y.Sano
• 通讯作者: Y.Sano

放射光CTによるアルムニウム合金疲労き裂のイメージング

使用同步辐射 CT 对铝合金疲劳裂纹进行成像

• 发表时间: 2007
• 作者: 佐野雄二;政木清孝;秋田貢一;越智保雄;梶原堅太郎
• 通讯作者: 梶原堅太郎

Effect of Laser Peening Treatment on Fatigue Crack Propagati on Property In Pre-cracked SUS316L

激光喷丸处理对预裂SUS316L疲劳裂纹扩展性能的影响

• 发表时间: 2007
• 作者: T. Ikarashi;K. Masaki;Y. Ochi;T . Matsumura;Y. Sano
• 通讯作者: Y. Sano

Enhancement of Surface Propeerty by Low-Energy Laser Peening without Protective Coatin

无保护涂层的低能量激光喷丸增强表面性能

• 发表时间: 2007
• 期刊: Key Engineering Materials B 345/346
• 作者: Y. Sano;T. Adachi;K. Akita;I. Altenberger;M. A;Cherif;B. Scholtes;K. Masaki;Y. Ochi;T. Inoue
• 通讯作者: T. Inoue