Effect of Heat Treatment on the Microstructure, Mechanical Properties and Corrosion Resistance of Selective Laser Melted 304L Stainless Steel

The influence of heat treatment holding temperatures from 600 to 1300 °C on the microstructure, mechanical properties and corrosion resistance in selective laser melted (SLMed) 304L stainless steel is investigated this work. results reveal that there no remarkable microstructure change after at for 2 h, while recrystallization leads a slight decrease grain size temperature range 700–900 °C. 1000 h obviously affects morphology grains SLMed steel. Combining effects coarsening, delta-ferrite (δ) phases reduction residual stress release during lead yield strength an increasing elongation. elongation samples treated 800 is, however, significantly decreased due increase amount sigma (σ) phase. A δ ferrite but ductility h. improved substantial brittle phase (σ). There obvious effect presence behavior.