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<p>The fabrication of high-performance metal microfluidic devices faces a dual challenge that existing manufacturing routes cannot resolve. Conventional CNC machining of 316L stainless steel generates 30-40% material waste and struggles to consistently achieve the sub-0.1&#xa0;µm surface roughness required for stable laminar flow. In contrast, laser powder bed fusion (L-PBF) offers near-net-shape deposition and high geometric freedom but produces as-built channel walls 15-100 times too rough for microfluidic operation. Overcoming this incompatibility without sacrificing geometric complexity, mechanical performance, or sustainability remains an open engineering problem. This research introduces a hybrid additive–subtractive manufacturing route that combines L-PBF of 316L stainless steel with in-envelope CNC micro-milling to enable near-zero-waste fabrication with quantified sustainability gains. A Taguchi L9 orthogonal array was used to optimize four process parameters: laser power (150-300&#xa0;W), scan speed (600-1200&#xa0;mm/s), layer thickness (30-100&#xa0;µm), and milling feed per tooth (0.01-0.05&#xa0;mm/tooth). Response variables included surface roughness (Ra), channel dimensional accuracy, porosity, residual stress, Vickers hardness, and material waste. The optimized hybrid process achieved 0.1&#xa0;µm Ra surface roughness, a 2.5% channel dimensional deviation, and 98% material utilization. Specific energy consumption was monitored, and cradle-to-gate carbon footprint analysis benchmarked the hybrid route against conventional CNC machining and an L-PBF-only route. Powder recyclability over five reuse cycles was evaluated via SEM-based particle morphology, Hall flow testing, and monitoring property trends. The hybrid approach reduced material waste to below 2% while maintaining part density above 99.5% and microhardness near 220&#xa0;HV. For a ten-device build plate, total processing time was about 6.2&#xa0;h versus 3.5&#xa0;h for conventional machining, with the additional time offset by eliminating material waste and most post-process finishing. These establish hybrid L-PBF/micro-milling as quantifiably sustainable route manufacturing high-performance metal microfluidic devices for chemical process intensification, medical diagnostics, and lab-on-chip biosensors.</p>

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Hybrid Additive–Subtractive Manufacturing of 316L Stainless Steel Microfluidic Devices: Process Optimization, Near-Zero Waste Fabrication, and Lifecycle Sustainability Assessment

  • 期刊论文

  • 发表日期：

    2026年7月6日

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  • Suresh Pratap,
  • Pradyut Anand

摘要

The fabrication of high-performance metal microfluidic devices faces a dual challenge that existing manufacturing routes cannot resolve. Conventional CNC machining of 316L stainless steel generates 30-40% material waste and struggles to consistently achieve the sub-0.1 µm surface roughness required for stable laminar flow. In contrast, laser powder bed fusion (L-PBF) offers near-net-shape deposition and high geometric freedom but produces as-built channel walls 15-100 times too rough for microfluidic operation. Overcoming this incompatibility without sacrificing geometric complexity, mechanical performance, or sustainability remains an open engineering problem. This research introduces a hybrid additive–subtractive manufacturing route that combines L-PBF of 316L stainless steel with in-envelope CNC micro-milling to enable near-zero-waste fabrication with quantified sustainability gains. A Taguchi L9 orthogonal array was used to optimize four process parameters: laser power (150-300 W), scan speed (600-1200 mm/s), layer thickness (30-100 µm), and milling feed per tooth (0.01-0.05 mm/tooth). Response variables included surface roughness (Ra), channel dimensional accuracy, porosity, residual stress, Vickers hardness, and material waste. The optimized hybrid process achieved 0.1 µm Ra surface roughness, a 2.5% channel dimensional deviation, and 98% material utilization. Specific energy consumption was monitored, and cradle-to-gate carbon footprint analysis benchmarked the hybrid route against conventional CNC machining and an L-PBF-only route. Powder recyclability over five reuse cycles was evaluated via SEM-based particle morphology, Hall flow testing, and monitoring property trends. The hybrid approach reduced material waste to below 2% while maintaining part density above 99.5% and microhardness near 220 HV. For a ten-device build plate, total processing time was about 6.2 h versus 3.5 h for conventional machining, with the additional time offset by eliminating material waste and most post-process finishing. These establish hybrid L-PBF/micro-milling as quantifiably sustainable route manufacturing high-performance metal microfluidic devices for chemical process intensification, medical diagnostics, and lab-on-chip biosensors.