Microstructural Evolution of a Selective Laser Melted FeCoCrNiMn–(N,Si) High‐Entropy Alloy Subject to Cold‐Rolling and Subsequent Annealing

Herein this article, selective laser melting (SLM) technique is used to manufacture N and Si contained FeCoCrNiMn high‐entropy alloy (HEA). The SLMed FeCoCrNiMn–(N,Si) alloy is then treated by cold‐rolling and isochronous annealing. The influences of Si and N additions on the microstructural evolution and tensile properties of the HEA are investigated. It is shown that adding Si and N elements increases the recrystallization temperature and postpones the whole recrystallization processing of the alloy. The annealing‐induced anomalous hardening is seen for the alloy at both 500 and 600 °C. When the annealing treatment temperature is 800 °C and above, the alloy is fully recrystallized in 1 h. The tensile properties evolution of the FeCoCrNiMn–(N,Si) alloy with annealing temperature has the similar tendency to the equiatomic FeCoCrNiMn alloy. In addition, uniformly distributed Cr 2 N particles form during the annealing processing. The dispersion and small size of the Cr 2 N particles significantly improve the tensile mechanical properties of the alloy by inhibiting the movements of both dislocations and grain boundaries.