The effect of heat-treatment on an additively manufactured austenitic stainless steel 316L was investigated in samples annealed at various temperatures. A multi-scale structure was observed in the as-manufactured material, composed of grains, cell blocks and dislocation cells with low boundary misorientation angles, dislocations and nano-sized particles. After annealing for 1 h at 400ºC, a 10% increase in yield strength and little loss of tensile elongation was observed, associated with the formation of nano-sized silicates. With further increase of annealing temperature, the strength was decreased, attributed to thermal instability of the cell structure. The results demonstrate that by careful controlling of annealing conditions the structure and mechanical properties of the additive manufactured austenitic stainless steel can be optimized by post-manufacturing heat-treatment.
|Title of host publication||Proceedings of the 40th Risø International Symposium on Materials Science: Metal Microstructures in 2D, 3D and 4D|
|Publisher||DTU Mechanical Engineering|
|Publication status||Published - 2019|
|Event||40th Risø International Symposium on Material Science: Metal Microstructures in 2D, 3D, and 4D - Roskilde, Denmark|
Duration: 2 Sep 2019 → 6 Sep 2019
|Conference||40th Risø International Symposium on Material Science: Metal Microstructures in 2D, 3D, and 4D|
|Period||02/09/2019 → 06/09/2019|