At the National University of Science and Technology "MISIS" (NUST MISIS), an innovative approach has been developed and patented to prevent the appearance of defects in aluminum alloys during the production of parts using 3D printing and laser melting. This was reported by the university's press service.
Scientists have for the first time used a combination of zirconium, scandium, titanium, and boron to process high-strength aluminum alloys. These modifiers contribute to the formation of smaller crystal grains and prevent the formation of undesirable columnar structures. The latter lead to defects in 3D printing and laser melting of aluminum materials.
The new method makes it possible to prevent defects caused by uneven distribution of alloying elements. Specialists at metalworking enterprises often encounter this problem, as well as when using three-dimensional printing, welding, surface treatment and other types of laser melting.
It was proposed to heat the melting areas to a temperature of 350°C–480°C. This approach made it possible to take into account the various mechanisms of action of the modifiers and to use their individual properties as efficiently as possible. An additional annealing stage increased the homogeneity of the material and prevented cracking of the alloy.
We recorded a decrease in grain size by 15-30 times both in the cast state and after laser melting. This effect has a positive effect on the mechanical properties of the material.
The development will allow the production of defect-free parts of internal combustion engines and high-tech body parts.
Earlier www1.ru reported that a digital model was created in Moscow to improve the processing of mining waste.
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