21-6-9 is a nitrogen strengthened austenitic stainless steel (ASS) with high strength, good corrosion resistance at high temperatures, and retained toughness at cryogenic temperatures. Due to its oxidation resistance at high temperature, this alloy is used in aerospace applications.

Laser powder fusion (LPBF) is a promising metal additive manufacturing (AM) process that can produce components with complex geometries. AM is a manufacturing process that enhances the mechanical properties and reduced production time with minimal wastage.

For the first time, 21-6-9 has been manufactured using the (AM) process laser powder bed fusion (LPBF). Therefore, a design of experiments (DOE) were performed to obtain optimized process parameters in regard to low defect density. With the optimized process parameters, another build was built for tensile testing in two directions i.e., vertical & horizontal.

The tensile test was performed at 22 °C & 750 °C. By analysing the tensile test result, it was found that there is no anisotropic behaviour. The tensile test result shown a yield strength of 620 MPa, an ultimate tensile strength of 825 MPa & ductility of 41% at room temperature. However, the specimens tested at the evaluated temperature shown lower tensile properties than room temperature tested specimens