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<p>Thermally assisted machining (TAM) is a technique in which the workpiece is heated during cutting to improve machinability. The increase in temperature enhances material ductility while reducing strength and hardness, which helps minimize tool wear. This approach has shown promise for machining difficult-to-machine materials, such as super austenitic stainless steels (SASS). Therefore, this study evaluates the influence of TAM on SASS machining by comparing machining forces, tool wear, and surface finish in the end milling of 254&#xa0;SMO heated to 200&#xa0;ºC with dry cutting and commercial nanofluid minimum quantity lubrication (NMQL). The results indicate that machining forces in TAM were, on average, 18.4% lower than in dry cutting and comparable to those in NMQL (19.3% reduction), suggesting that thermal softening facilitated chip deformation and reduced cutting forces. In addition, tool wear in TAM was lower than in dry cutting but slightly higher than in NMQL, especially toward the end of the test. Despite reducing machining forces and tool wear, surface analysis revealed the presence of adhered material and defects such as smearing and side flow. These findings suggest that while TAM improves machinability, the elevated workpiece temperature may negatively impact the surface quality.</p>

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Investigation of thermally assisted end milling of 254 SMO super austenitic stainless steel

  • 期刊论文

  • 发表日期：

    2025年5月7日

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  • Émerson S. Passari,
  • André J. Souza,
  • Carlos A. G. Aita,
  • Guilherme V. Schirmer,
  • Liu Y. Barros

摘要

Thermally assisted machining (TAM) is a technique in which the workpiece is heated during cutting to improve machinability. The increase in temperature enhances material ductility while reducing strength and hardness, which helps minimize tool wear. This approach has shown promise for machining difficult-to-machine materials, such as super austenitic stainless steels (SASS). Therefore, this study evaluates the influence of TAM on SASS machining by comparing machining forces, tool wear, and surface finish in the end milling of 254 SMO heated to 200 ºC with dry cutting and commercial nanofluid minimum quantity lubrication (NMQL). The results indicate that machining forces in TAM were, on average, 18.4% lower than in dry cutting and comparable to those in NMQL (19.3% reduction), suggesting that thermal softening facilitated chip deformation and reduced cutting forces. In addition, tool wear in TAM was lower than in dry cutting but slightly higher than in NMQL, especially toward the end of the test. Despite reducing machining forces and tool wear, surface analysis revealed the presence of adhered material and defects such as smearing and side flow. These findings suggest that while TAM improves machinability, the elevated workpiece temperature may negatively impact the surface quality.