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Ultrasound Can Help Improve Strength of 3D-Printed Metals




Scientists from the Royal Melbourne Institute of Technology (RMIT) discovered that ultrasonic exposure during 3D printing by Direct Laser Deposition allows obtaining high-strength metal products and even adjust the mechanical characteristics of individual sections.

The idea of ultrasonic exposure is borrowed to some extent from the powder metal industry: powder materials are often compacted before molding using ultrasonic vibrations. The Australian team conducted experiments on ultrasonic compaction right during 3D printing: the idea was not to compact the original powder but to change the microstructure of the resulting products.

The researchers point out that products produced by laser sintering of metal powders are notable for anisotropy — they consist of rather large, elongated crystals, which leads to a decrease in strength and increases the risk of cracking during printing. When the sintered material is exposed to ultrasonic waves, a stronger and denser microstructure is formed with smaller and equiaxed crystals. The scientists tested the idea on the directed energy deposition (DED) technology, where the powder is sprayed onto the substrate by a gas jet and selectively sintered with a laser emitter. The only difference was that a sonotrode and a 500-watt piezoelectric сonverter with a 20 kHz oscillation frequency were connected to the substrate.

The main material of the research was Ti-6Al-4V titanium alloy powder. During the experiments, the team managed to increase the creep limit and strength by 12%. For the sake of the experiment’s purity and proof of the general applicability of the method, the experiments were repeated with the heat-resistant nickel-chrome Inconel 625 alloy, with similar results. Interestingly enough, the method allows you to create products with a functionally-graded structure, that is, to adjust the strength characteristics of individual sections of printed products using selective ultrasonic exposure.

Although we used a titanium alloy and a nickel-based superalloy, we expect that the method can be applied to other commercial metals, such as stainless steels, aluminum alloys, and cobalt alloys,” – explains professor Ma Qian.“

Scientists believe that the method will be effective not only in conjunction with the technology of direct laser deposition of metal powders but also when working with rod-shaped materials. But there are also limitations: ultrasound can disrupt the distribution of powder in selective laser sintering or melt (DMLS and SLM), so for these methods, it is most likely that focused exposure is required directly on the sintered/fused areas.

Laser Sintering is not the only 3D printing technology that can show promise and deliver amazing results. If you’re opening a 3D printing-based business you will definitely want to check out the SLA technology. Whether you need it for your business or just for your hobby, a good SLA 3D printer will meet all your expectations. The Phrozen company is one of the biggest players in the current 3D printing market. The company offers multiple high-precision additive manufacturing devices, including the Phrozen Shuffle 4K 3D printer, one of the best solutions for a moderate price.

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10 Wall Art Ideas to Refresh Your Space



Into The Woods

If your walls are empty and you are looking for different decor ideas, then there are a number of possibilities available to refresh your space. You can easily make your house feel like a home with a little effort.

If you really want to make your bare walls stylish then keep reading this article. No matter your style or whether you are an art collect, nature lover, or a technology enthusiast a 5 piece wall art can turn your bare wall to an artistic masterpiece.

Here are the best 5 piece wall art that can refresh your space.

Manhattan 5 Panel Wall Art

This stunning artwork shows a view of Manhattan from across the bridge. In order to give it a great look, the original beautiful monochrome and has been split into 5 diamond-shaped sections.

Poppy Dreams 5 Panel

If you are an abstract art lover then this 5-Panel Abstract Canvas Wall Art showing poppies with a dreamlike haze effect will make you fall in love with it. The artwork masterpiece has been divided into a striking diamond shape to give your wall an amazing look.

Tropical Paradise 5

This amazing diamond-shaped tropical paradise scene will give you an essence of tropical lands. It is divided into 5 panels.

London Bridge 5 Panel

What could be a better scene than London Tower Bridge for a travel enthusiast? This amazing 5 panel Print of London Tower Bridge at night is the perfect fit for your living room.

Street Art Diamond

This wall art a great Diamond Shaped Split Canvas of a Street Art design featuring a Marvel-style superhero. A must thing to have for street art lovers.

Purple Shores

This breathtaking photo was taken at a serene lake at sunset and has stunning purple tones. This can easily fit into the wall of any room.

Into The Woods

This impressive piece of art features a beautiful dawn-touched forest, littered with leaves in the fall season and giving a haunting appeal, ready to hang on your walls.

Singapore 5 Panel

Yet another marvel for destination lovers, a beautiful 5 Panel Wall Art Canvas Print of Singapore City Skyline at night can be a great choice for you.

Blue Floral

This is a stunning art print featuring a stunning flower taken using soft focus making it a very elegant wall art piece. This wall art will give your wall an amazing fresh look.

Lake Serenity

The best time is the one spent by the lake. Then why not get a lake wall art in your room? This stunning Wall Art Canvas Print of a tranquil lake surrounded by mountains divided into a striking diamond shape is a perfect fit for your wall.

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