Abstract The Precipitation Hardening (PH) Stainless Steel (SS) is considered as a promising alternative for aerospace and marine sectors owing to its good mechanical properties with high corrosion resistance. But the lower thermal conductivity and the presence of precipitates lower its machinability in terms of rapid tool wear. In this context, this study aims to analyze the dry, flood, MQL (Minimum Quantity Lubrication), and cryogenic machining with LCO2 in terms of tool wear for the turning tests of 15-5 PH SS. Apart from progressive flank wear, the machining performance of different cutting fluid strategies is compared by analyzing the crater wear, progressive power consumption, and surface roughness, microhardness, and microstructure of machined surface and chip. The performance of sustainable cryogenic machining is found superior in terms of lower tool wear, power consumption, subsurface microhardness. The relatively finer grain size and helical chip with smaller diameter are produced in the cryogenic machining while the better surface finish is observed for the flood machining in contrast to other cutting fluid strategies.

中文翻译：

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15-5-PH SS合金加工过程中干法、溢流、MQL和低温CO2工艺对比分析

摘要 沉淀硬化（PH）不锈钢（SS）具有良好的机械性能和高耐腐蚀性，被认为是航空航天和海洋领域的一种有前途的替代材料。但是较低的热导率和沉淀物的存在降低了它在快速刀具磨损方面的可加工性。在此背景下，本研究旨在分析干式、溢流、MQL（最小量润滑）和 LCO2 低温加工在刀具磨损方面的 15-5 PH SS 车削试验。除了渐进式后刀面磨损外，通过分析加工表面和切屑的弧坑磨损、渐进式功耗以及表面粗糙度、显微硬度和微观结构，比较了不同切削液策略的加工性能。可持续低温加工的性能在较低的刀具磨损、功耗和次表面显微硬度方面表现优异。在低温加工中产生相对更细的晶粒尺寸和较小直径的螺旋切屑，而与其他切削液策略相比，溢流加工观察到更好的表面光洁度。