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<p>This study investigates the impact of cutting speed and laser focus position on surface roughness, kerf geometry, and microhardness during fiber laser cutting of 4 mm-thick AISI 304 stainless steel sheet. A series of experimental trials were conducted using fiber laser cutting with cutting speeds ranging from 1.5 to 3.5 m/min and focus settings between 30 and 50%, at fixed power of 2000 W and gas pressure equals 14 bar. Surface roughness (Ra) was found to decrease with increasing cutting speed; the highest Ra value recorded was 5.4 µm at 1.5 m/min and 40% focus, while the lowest value was approximately 4.0 µm at 3.5 m/min and 50% focus. Kerf width similarly decreased with increasing speed and optimal focus, narrowing from 185 µm at 1.5 m/min and 30% focus to as low as 138 µm at 3.5 m/min and 50% focus. Microhardness varied non-linearly, reaching a peak of 270 HV at 2.0 m/min and 30% focus, indicating favorable thermal gradients. SEM, EDS, and XRD analysis validated the outcomes indicative of a balanced performance across all evaluated parameters. These findings guide laser cutting optimization for improved precision and mechanical performance in stainless steel.</p>

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Characterization of AISI 304 stainless steel based on laser cutting process optimization

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年11月20日

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  • A. S. Ali,
  • Tamer Abdelmonem,
  • Ramadan Elsoeudy,
  • M. Abdel Mohsen,
  • N. Elzayady

摘要

This study investigates the impact of cutting speed and laser focus position on surface roughness, kerf geometry, and microhardness during fiber laser cutting of 4 mm-thick AISI 304 stainless steel sheet. A series of experimental trials were conducted using fiber laser cutting with cutting speeds ranging from 1.5 to 3.5 m/min and focus settings between 30 and 50%, at fixed power of 2000 W and gas pressure equals 14 bar. Surface roughness (Ra) was found to decrease with increasing cutting speed; the highest Ra value recorded was 5.4 µm at 1.5 m/min and 40% focus, while the lowest value was approximately 4.0 µm at 3.5 m/min and 50% focus. Kerf width similarly decreased with increasing speed and optimal focus, narrowing from 185 µm at 1.5 m/min and 30% focus to as low as 138 µm at 3.5 m/min and 50% focus. Microhardness varied non-linearly, reaching a peak of 270 HV at 2.0 m/min and 30% focus, indicating favorable thermal gradients. SEM, EDS, and XRD analysis validated the outcomes indicative of a balanced performance across all evaluated parameters. These findings guide laser cutting optimization for improved precision and mechanical performance in stainless steel.