Research Subtitle:
Paving the way to custom function control that goes beyond conventional mechanical functions

Title Image SP:
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Announcement Date
2025-06-24

Research Highlight
engineering

Term Index
{'items': [{'description': {'blocks': [{'key': '76jjg', 'text': 'A technology which melts and layers metal powder with a laser or electron beam to create parts with complex shapes. It has a high degree of freedom in shape design, making it possible to create shapes and lighten weights that are difficult to achieve with conventional processing method. It is increasingly used in various fields such as aerospace, medical, and automotive.', 'type': 'unstyled', 'depth': 0, 'inlineStyleRanges': [], 'entityRanges': [], 'data': {}}], 'entityMap': {}}, 'key': '97lcs', 'term': 'Metal 3D printing'}, {'description': {'blocks': [{'key': 'bl5vs', 'text': 'A microstructure in which the same crystal structure is arranged in layers with different orientations. The crystal structure with <011> oriented in the build direction is called the main layer, and the crystal structure with <001> oriented in the build direction is called the sub-layer, and the two layers spaced about 100 μm apart. It is found in Ni-based alloys and austenitic stainless steel SUS316L.', 'type': 'unstyled', 'depth': 0, 'inlineStyleRanges': [], 'entityRanges': [], 'data': {}}], 'entityMap': {}}, 'key': 'dgmft', 'term': 'Crystallographic lamellar structure'}, {'description': {'blocks': [{'key': '704ja', 'text': 'A solidification structure formed by ultra-rapid solidification, accompanied by elemental segregation and dislocation accumulation. It is a specific microstructure unique to metal 3D printing, and is extremely fine, generally measuring several hundred nm inside the cell and several tens of nm at the interface. This research has revealed that it has a significant impact on mechanical properties. Its formation has been confirmed in various alloy systems, including Ni-based alloys.', 'type': 'unstyled', 'depth': 0, 'inlineStyleRanges': [], 'entityRanges': [], 'data': {}}], 'entityMap': {}}, 'key': '2rotm', 'term': 'Cellular structure'}, {'description': {'blocks': [{'key': '6kbcn', 'text': 'The LPBF method is a representative type of metal 3D printing technology in which a thin layer of metal powder is irradiated with a laser, and then selectively melted and solidified to create a shape. In addition to being able to create complex shapes with high precision, this method is capable of producing bulk bodies through ultra-rapid solidification at 107 K/s, which is not possible with conventional methods, and artificial material control that takes advantage of this ultra-rapid cooling has been attracting attention in recent years.', 'type': 'unstyled', 'depth': 0, 'inlineStyleRanges': [], 'entityRanges': [], 'data': {}}], 'entityMap': {}}, 'key': '6i62i', 'term': 'Laser powder bed fusion'}, {'description': {'blocks': [{'key': '93rp2', 'text': 'In 3D printing, this is a combination of the scanning direction of the heat source for each layer, and many types have been developed. Generally, it is selected to suppress deformation due to residual stress in the model, but in this research, it is used as a parameter to control the crystal orientation.', 'type': 'unstyled', 'depth': 0, 'inlineStyleRanges': [], 'entityRanges': [], 'data': {}}], 'entityMap': {}}, 'key': '8vn13', 'term': 'Scanning strategy'}, {'description': {'blocks': [{'key': 'dnbj6', 'text': 'A tiny mlet pool which is formed when the heat source is scanned in 3D printing. Since the object is formed by stacking these melt pools, it can be said as a unit element of structure control in 3D printing. The heat flow distribution and temperature history inside the melt pool control the formation of the metal structure.', 'type': 'unstyled', 'depth': 0, 'inlineStyleRanges': [], 'entityRanges': [], 'data': {}}], 'entityMap': {}}, 'key': 'cn4c2', 'term': 'Melt pool'}, {'description': {'blocks': [{'key': '8d8mc', 'text': 'Ordinary metals are polycrystalline, with crystals oriented in various directions, and have grain boundaries. In contrast, metals in which the crystals are oriented in the same direction in all locations are called single crystals. Because there are no grain boundaries, the properties of the crystal structure (atomic arrangement) are directly reflected, resulting in anisotropy in the physical and chemical properties. The research group has used 3D printing to realize single crystal formation in alloy systems that exhibit various crystal structures, using a scanning strategy that takes into account symmetry based on the crystal structure.', 'type': 'unstyled', 'depth': 0, 'inlineStyleRanges': [], 'entityRanges': [], 'data': {}}], 'entityMap': {}}, 'key': '5r275', 'term': 'Single crystal'}]}

Departments

Related Teachers
['Takayoshi Nakano']

Teacher Comment
As digital transformation in manufacturing advances, artificial manufacturing methods based on data from 3D printing technology are attracting attention. As 3D printing is a manufacturing process that accounts for a large part of the process from raw materials to the final shape, the research fields that can be approached are wide. Among them, the results of this research, which elucidate the relationship between the ultra-rapid solidification and functionality, can be said to be a starting point of research that will have an impact not only on the design guidelines for the final structure but also on alloy development at the early stage of the process. By linking this result with various other research, foundations for 3D printing technology that will completely change the conventional wisdom of manufacturing, can be built. We envision a future in which metal 3D printing technology will be used in various manufacturing processes in society.

Teacher Image
https://researchmap.jp/read0013987/avatar.jpg

Teacher Name
NAKANO Takayoshi

Teacher Position
Professor

Teacher Division1
Graduate School of Engineering

Teacher Division2

Teacher URL
https://rd.iai.osaka-u.ac.jp/en/9136b32e9deb72a2.html