Creation of in-situ-local microporous metal by porosity controlled at the laser-irradiated unit

2016 Fiscal Year Final Research Report

• Project/Area Number: 25289240
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Composite materials/Surface and interface engineering
• Research Institution: Osaka University
• Principal Investigator: Kawahito Yousuke 大阪大学, 接合科学研究所, 准教授 (70379105)
• Co-Investigator(Kenkyū-buntansha): 川上 博士 三重大学, 工学(系)研究科(研究院), 准教授 (00252338) ; 片山 聖二 大阪大学, 接合科学研究所, 教授 (10144528) ; 西本 浩司 阿南工業高等専門学校, その他部局等, 准教授 (40501169) ; 村川 英一 大阪大学, 接合科学研究所, 教授 (60166270)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: レーザ / 溶接 / ポロシティ / 制御 / その場局所 / マイクロポーラス / 金属

Outline of Final Research Achievements

It is necessary to simultaneously reduce weight and enhance functionality of materials in low carbon society. Porous metals are one of promising materials. In this research, we conduct a fundamental research to create a microporous metal in the world by controls of the vacancies (porosity: welding defect) formed in the laser-irradiated weld metal. Therefore, we clarified the porosity formation process based on the world's first high-intensity X-ray transmission three-dimensional observation under various laser welding conditions for titanium, steel including stainless steel and aluminum alloy. We numerically analyze formation of a keyhole which causes porosity by fluid analysis particle method suitable for phase transformation and large deformation. Moreover, we control porosity formation at the laser-irradiated unit for creation of in-situ-local microporous metal.

Free Research Field

溶接・接合