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Stainless Steel Powder-An Important Part Of The 3D Printing Industry Chain For Metal Parts

wallpapers Industry 2020-07-28

The metal powder used in 3D printing generally requires high purity, good sphericity, narrow particle size distribution, and low oxygen content. At present, the metal powder materials used in 3D printing mainly include titanium alloy, cobalt-chromium alloy, stainless steel, and aluminum alloy materials. There are also precious metal powder materials such as gold and silver used for printing jewelry. 3D printing metal powder is the most critical part of the metal parts 3D printing industry chain, and it is also the most significant value.

At the "2013 World 3D Printing Technology Industry Conference", authoritative experts in the world's 3D printing industry gave a clear definition of 3D printing metal powder: a group of metal particles smaller than 1mm in size. Including single metal powder, alloy powder, and some refractory compound powder with metallic properties. 3D printing metal powder materials include cobalt-chromium alloys, stainless steel, industrial steel, bronze alloys, titanium alloys, and nickel-aluminum alloys. However, in addition to good plasticity, 3D printing metal powder must also meet the requirements of excellent powder particle size, narrow particle size distribution, high sphericity, good fluidity, and high bulk density.

Stainless steel has the characteristics of chemical corrosion resistance, high-temperature resistance, and excellent mechanical properties. Due to its good powder formability, simple preparation process, and low cost, it is the earliest material used in 3D metal printing. For example, Huazhong University of Science and Technology, Nanjing University of Aeronautics and Astronautics, Northeastern University, and other institutions have in-depth research on metal 3D printing. Current research mainly focuses on reducing porosity, increasing strength, and the spheroidization mechanism of metal powder during melting. Li Ruidi and others used different process parameters to carry out SLM forming tests on 304L stainless steel powder. They obtained the empirical formula of 304L stainless steel density and summarized the grain growth mechanism.

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