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<p>The discovery of oil reserves in deep and ultra-deep waters has boosted the demand for products and components made from supermartensitic stainless steel (SMSS). Understanding the machinability of this steel grade under different cutting conditions is essential for component design and optimization of manufacturing processes. However, its behavior during turning is not fully explored. Within this context, this work investigates the influence of the lubrication-cooling method (dry, flooding, and cold air by vortex tube) and the cutting parameters (cutting speed and feed rate) on the machinability of an SMSS with tungsten carbide inserts. The results suggest that the turning force components are affected by the feed rate and cutting speed only, with the feed rate being the sole parameter influencing surface roughness. Nevertheless, the tool temperature depends on the lubrication-cooling method and cutting parameters. Moreover, tool life tests revealed that flooding turning prolongs tool life compared to dry cutting and cold air at a cutting speed of 160&#xa0;m/min. However, its effectiveness diminishes at higher cutting speeds, such as 200&#xa0;m/min. Dry cutting proved most effective at this cutting speed, while cold air was ineffective. Wear mechanisms (a combination of abrasion, attrition, diffusion, and sliding wear) and dilatometry tests demonstrate the sensitivity of SMSS machinability to cutting conditions. Lastly, X-ray diffraction analysis confirmed martensitic phase transformation across all tested cutting conditions, highlighting the pivotal role of customizing lubrication and cooling methods for each cutting parameter to optimize the machinability of SMSS.</p>

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The machinability of supermartensitic stainless steel using different lubrication/cooling systems

  • 期刊论文

  • 发表日期：

    2025年2月14日

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  • Fernando Júnio Duarte,
  • Augusto Moura Martins,
  • Anderson Júnior dos Santos,
  • Patrícia Canazart Azzi,
  • José Domingos Ardisson,
  • Camila Nunes Costa Corgozinho,
  • Alexandre Mendes Abrão

摘要

The discovery of oil reserves in deep and ultra-deep waters has boosted the demand for products and components made from supermartensitic stainless steel (SMSS). Understanding the machinability of this steel grade under different cutting conditions is essential for component design and optimization of manufacturing processes. However, its behavior during turning is not fully explored. Within this context, this work investigates the influence of the lubrication-cooling method (dry, flooding, and cold air by vortex tube) and the cutting parameters (cutting speed and feed rate) on the machinability of an SMSS with tungsten carbide inserts. The results suggest that the turning force components are affected by the feed rate and cutting speed only, with the feed rate being the sole parameter influencing surface roughness. Nevertheless, the tool temperature depends on the lubrication-cooling method and cutting parameters. Moreover, tool life tests revealed that flooding turning prolongs tool life compared to dry cutting and cold air at a cutting speed of 160 m/min. However, its effectiveness diminishes at higher cutting speeds, such as 200 m/min. Dry cutting proved most effective at this cutting speed, while cold air was ineffective. Wear mechanisms (a combination of abrasion, attrition, diffusion, and sliding wear) and dilatometry tests demonstrate the sensitivity of SMSS machinability to cutting conditions. Lastly, X-ray diffraction analysis confirmed martensitic phase transformation across all tested cutting conditions, highlighting the pivotal role of customizing lubrication and cooling methods for each cutting parameter to optimize the machinability of SMSS.