TY - JOUR
T1 - Effect of heat treatment on microstructure and mechanical properties of 316L steel synthesized by selective laser melting
AU - Salman, O. O.
AU - Gammer, Christoph
AU - Eckert, Jürgen
AU - Chaubey, Anil K.
AU - Scudino, Sergio
PY - 2019/1/31
Y1 - 2019/1/31
N2 - The influence of annealing at different temperatures (573, 873, 1273, 1373 and 1673 K) on the stability of phases, composition and microstructure of 316L stainless steel fabricated by SLM has been investigated and the changes induced by the heat treatment have been used to understand the corresponding variations of the mechanical properties of the specimens under tensile loading. Annealing has no effect on phase formation: a single-phase austenite is observed in all specimens investigated here. In addition, annealing does not change the random crystallographic orientation observed in the as-synthesized material. The complex cellular microstructure with fine subgrain structures characteristic of the as-SLM specimens is stable up to 873 K. The cell size increases with increasing annealing temperature until the cellular microstructure can no longer be observed at high temperatures (T ≥ 1273 K). The strength of the specimens decreases with increasing annealing temperature as a result of the microstructural coarsening. The excellent combination of strength and ductility exhibited by the as-synthesized material can be ascribed to the complex cellular microstructure and subgrains along with the misorientation between grains, cells, cell walls and subgrains.
AB - The influence of annealing at different temperatures (573, 873, 1273, 1373 and 1673 K) on the stability of phases, composition and microstructure of 316L stainless steel fabricated by SLM has been investigated and the changes induced by the heat treatment have been used to understand the corresponding variations of the mechanical properties of the specimens under tensile loading. Annealing has no effect on phase formation: a single-phase austenite is observed in all specimens investigated here. In addition, annealing does not change the random crystallographic orientation observed in the as-synthesized material. The complex cellular microstructure with fine subgrain structures characteristic of the as-SLM specimens is stable up to 873 K. The cell size increases with increasing annealing temperature until the cellular microstructure can no longer be observed at high temperatures (T ≥ 1273 K). The strength of the specimens decreases with increasing annealing temperature as a result of the microstructural coarsening. The excellent combination of strength and ductility exhibited by the as-synthesized material can be ascribed to the complex cellular microstructure and subgrains along with the misorientation between grains, cells, cell walls and subgrains.
UR - http://www.scopus.com/inward/record.url?scp=85060878746&partnerID=8YFLogxK
U2 - 10.1016/j.msea.2019.01.110
DO - 10.1016/j.msea.2019.01.110
M3 - Article
SN - 0928-4931
VL - 748.2019
SP - 205
EP - 212
JO - Materials science and engineering C (Biomimetic and supramolecular systems)
JF - Materials science and engineering C (Biomimetic and supramolecular systems)
IS - 4 March
ER -