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In metal additive manufacturing, laser powder bed fusion manufacturing is one of the most advanced processes that can create intricate shapes with high printing precision. This study examines the impact of heat treatment on austenitic stainless steel AISI 316L produced via the laser powder bed fusion (LPBF) process. Post-processing is invariably necessary for additive manufactured components to achieve the desired mechanical and surface quality. The effect of different heat treatment methods, including solution annealing and quenching, on LPBF-fabricated AISI316L is empirically examined. During heat treatment, a stable γ-austenite phase is present at temperature ranges of 650 ℃, 900 ℃, and 1050 ℃. After heat treatment at 900 ℃ and 1050 ℃, decreases in hardness were observed due to the coarsening of the cellular structure at elevated temperatures. The thermal residual stresses were completely removed during heat treatment at elevated temperatures of 950 ℃ and 1050 ℃. After heat treatment, EBSD revealed an increase in deformation twins Σ3 because of improved crystal lattices and grain boundaries. After heat treatment, the HAGB’s are increased which resists the crack formation and gives good strength and ductility.

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Effect of Heat Treatment on the Microstructure and Grain Boundary Characteristics of AISI 316L Produced Using the Powder Bed Fusion Technique

  • 会议论文

  • 发表日期：

    2025年

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  • Vinothraj Usha Thangaraju,
  • Joel Jayaseelan,
  • Jeyapadiarajan Paulchamy,
  • Anthony Xavior Michael,
  • Ashwath Pazhani,
  • Andre Batako

摘要

In metal additive manufacturing, laser powder bed fusion manufacturing is one of the most advanced processes that can create intricate shapes with high printing precision. This study examines the impact of heat treatment on austenitic stainless steel AISI 316L produced via the laser powder bed fusion (LPBF) process. Post-processing is invariably necessary for additive manufactured components to achieve the desired mechanical and surface quality. The effect of different heat treatment methods, including solution annealing and quenching, on LPBF-fabricated AISI316L is empirically examined. During heat treatment, a stable γ-austenite phase is present at temperature ranges of 650 ℃, 900 ℃, and 1050 ℃. After heat treatment at 900 ℃ and 1050 ℃, decreases in hardness were observed due to the coarsening of the cellular structure at elevated temperatures. The thermal residual stresses were completely removed during heat treatment at elevated temperatures of 950 ℃ and 1050 ℃. After heat treatment, EBSD revealed an increase in deformation twins Σ3 because of improved crystal lattices and grain boundaries. After heat treatment, the HAGB’s are increased which resists the crack formation and gives good strength and ductility.