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<p>The present investigation aims to explore the response of stress relieving and solution annealing heat treatment on fracture toughness and tensile properties in two distinct routes of AM, namely selectively laser melted (SLM) and wire arc additively manufactured (WAAM) stainless steel 316L. The stress relieving treatment was done at 600&#xa0;°C and solution annealing treatment at 1200&#xa0;°C, both for a time duration of 6&#xa0;h. It has been found that although the tensile properties remain identical to the respective as-built counterparts for 600&#xa0;°C samples of SLM and WAAM, the fracture toughness shows a different response. A slight lowering in fracture toughness for the SLM sample is noticed while the value remains identical in the WAAM sample when compared to values of respective as-built parts. The mechanism for the lowering in SLM ties to the significant elimination of twinning, whereas the appearance of a new and hard sigma phase at locations of delta ferrite in the WAAM sample maintains a similar value. For heat treatment at 1200&#xa0;°C, a significant decrease in strength as well as fracture toughness is observed due to the elimination of as-built microstructure and coarsened grain size. The findings of the present work provide a maturity toward heat treatment practices and their consequences on mechanical response.</p>

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Response of Stress Relieving and Solution Annealing Treatment on Tensile Properties and Fracture Toughness of Additively Manufactured Stainless Steel 316L

  • 期刊论文

  • 发表日期：

    2025年5月9日

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  • Deepak Kumar,
  • Abhinav Arya,
  • Shubhendu Anupam Dutta,
  • Suyog Jhavar,
  • K. G. Prashanth,
  • Satyam Suwas

摘要

The present investigation aims to explore the response of stress relieving and solution annealing heat treatment on fracture toughness and tensile properties in two distinct routes of AM, namely selectively laser melted (SLM) and wire arc additively manufactured (WAAM) stainless steel 316L. The stress relieving treatment was done at 600 °C and solution annealing treatment at 1200 °C, both for a time duration of 6 h. It has been found that although the tensile properties remain identical to the respective as-built counterparts for 600 °C samples of SLM and WAAM, the fracture toughness shows a different response. A slight lowering in fracture toughness for the SLM sample is noticed while the value remains identical in the WAAM sample when compared to values of respective as-built parts. The mechanism for the lowering in SLM ties to the significant elimination of twinning, whereas the appearance of a new and hard sigma phase at locations of delta ferrite in the WAAM sample maintains a similar value. For heat treatment at 1200 °C, a significant decrease in strength as well as fracture toughness is observed due to the elimination of as-built microstructure and coarsened grain size. The findings of the present work provide a maturity toward heat treatment practices and their consequences on mechanical response.