Secondary hardening in laser rapidly solidified Fe68(MoWCrVCoNiAlCu)32 medium-entropy high-speed steel coatings

Microstructure and hardness variation of novel Fe68(MoWCrVCoNiAlCu)32 medium-entropy high-speed steel (ME-HSS) coatings with different C content: 0.65 wt%C (ME-HSS-065C), 0.85 wt%C(ME-HSS-085C) and 1.05 wt%C(ME-HSS-105C).139