Abstract
The global aim of the theme of magnesium alloy processing by the selective laser melting technology is to enable printing of replacements into the human body. By combining the advantages of WE43 magnesium alloy and additive manufacturing, it is possible to print support structures that have very similar properties to human bones. However, printing magnesium alloy parts is very difficult, and the printing strategies are still under development. Knowledge of weld deposit behaviour is needed to design a complex printing strategy and still missing. The main aim of the manuscript is the find a stable process window and identify the dependence of the weld deposit shape and properties on the laser power and scanning speed. The range of the tested parameters was 100ā400 W and 100ā800 mm/s for laser power and scanning speed. The profilometry and light microscopy were used to verify the continuity and shape evaluation. The microhardness and EDX analysis were used for the detailed view of the weld deposit. The manuscript specifies the weld deposit dimensions, their changes depending on laser power and scanning speed, and the continuity of the weld tracks. The stable weld deposits are made by the energy density of 5.5ā12 J/mm2. Thin walls were also created by layering welds to determine the surface roughness scattering (Ra 35ā60) for various settings of laser power and scanning speed.
Highlights
The materials used for implant replacements are corrosion-resistant steels, titanium and alloys based on cobalt and chromium
Combining different laser power (Lp) and Ls values resulted in different weld deposition shapes
The main purpose of the article is to clarify the behaviour of weld tracks made from WE43 magnesium alloy with various combinations of process parameters
Summary
The materials used for implant replacements are corrosion-resistant steels, titanium and alloys based on cobalt and chromium. The elastic modulus of these biomaterials does not match that of bone tissues, which leads to stress effects that may reduce stimulation of new bone growth and bone repair, reducing implant stability [6]. When these materials are used for implants, the patient usually has to undergo reoperation to remove screws, plates and pins used to stabilise the fracture. Its corrosion leads to the creation of a nontoxic oxide that is expelled from
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