Żaba Krzysztof, Tuz Lechosław, Noga Piotr, Rusz Stanislav, Zabystrzan Rostislav
Department of Metal Working and Physical Metallurgy of Non-Ferrous Metals, Faculty of Non-Ferrous Metals, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland.
Department of Physical & Powder Metallurgy, Faculty of Metal Engineering and Industrial Computer Science, AGH University of Science and Technology, Al. Mickiewicza 30, 30-059 Kraków, Poland.
Materials (Basel). 2022 Jan 27;15(3):974. doi: 10.3390/ma15030974.
This article presents a study on the influence of temperature and time of multi-variant heat treatment on the structure and properties of materials produced in direct metal laser sintering (DMLS) and casting technology. The materials were manufactured in the form of cuboidal elements with a cross-section of 1.5 mm × 15 mm and a length of 60 mm. The samples prepared in this way had a similar volume, but due to the production technology the metal crystallization took place at different rates and directions. In the cast, the direction of heat transfer was toward the mold, and the DMLS was directed locally layer by layer. The small thickness of the cast material allowed reaching conditions similar to the DMLS cooling process. Both DMLS and cast samples show similar mechanical properties (hardness) achieved after long ageing time, i.e., 16 h at 170 °C. The maximum hardness was observed for 8 h. In the DMLS samples, in contrast to cast samples, no lamellar precipitates of silicon were observed, which indicates their better resistance to cracking.
本文介绍了一项关于多变量热处理的温度和时间对直接金属激光烧结（DMLS）和铸造技术生产的材料的结构和性能影响的研究。材料制成横截面为1.5毫米×15毫米、长度为60毫米的长方体元件形式。以这种方式制备的样品具有相似的体积，但由于生产技术的原因，金属结晶以不同的速率和方向发生。在铸造过程中，热传递方向朝向模具，而DMLS是逐层局部定向的。铸造材料的小厚度使得能够达到与DMLS冷却过程相似的条件。DMLS和铸造样品在长时间时效（即170°C下16小时）后都显示出相似的机械性能（硬度）。在8小时时观察到最大硬度。与铸造样品相比，在DMLS样品中未观察到硅的层状析出物，这表明它们具有更好的抗裂性。
