Influence of pulsed laser ablation on the surface integrity of PCBN cutting tool materials
Influence of pulsed laser ablation on the surface integrity of PCBN cutting tool materials
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DOI：
10.1007/s00170-018-3032-4
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发表时间：
2019-04-01
影响因子：
3.4
通讯作者：
Grove, Thilo
中科院分区：
文献类型：
--
作者：
Denkena, Berend;Kroedel, Alexander;Grove, Thilo
多晶立方氮化硼（PCBN）作为切削工具材料广泛应用于工业中，用于加工硬化钢、铸造或镍基高温合金。激光烧蚀是一种新型的、有前途的刀具几何特征生成技术，具有无磨损、自动化程度高、几何形状灵活等优点。在这项研究中，烧蚀机制进行了实验研究，为广泛的激光脉冲持续时间（fs-ns制度）和激光诱导的表面性能的影响。通过使用拉曼光谱可以表明，激光诱导立方氮化硼向六方晶格结构（hBN）或氧化硼（B2 O3）的转变强烈地取决于激光源的单脉冲和面积能量密度。此外，几皮秒或更低的脉冲持续时间减少了热致相变。此外，它表明，使用ns-激光导致显着的熔化和再结晶过程的粘合剂材料，这降低了表面硬度。对于fs和ps激光源的使用，没有发现这种机制。
Polycrystalline cubic boron nitride (PCBN) is widely used in industry as a cutting tool material for the machining of hardened steels, cast, or nickel-based super alloys. For the generation of geometrical features of such tools, laser ablation is a novel and promising technology, which offers wear-free processing, high automation potential, and geometrical flexibility. In this study, the ablation mechanism is experimentally investigated for a wide range of laser pulse durations (fs-ns regime) and laser-induced effects on the surface properties are presented. It could be shown by using Raman spectroscopy that laser-induced transformations of cubic boron nitride to the hexagonal lattice structure (hBN) or boron oxide (B2O3) are strongly determined by the single pulse and areal fluence of the laser source. Furthermore, a pulse duration of few picoseconds or below reduces the thermally induced phase transformations. Moreover, it was shown that the use of ns-laser leads to significant melting and recrystallization processes of the binder material, which reduces surface hardness. This mechanism was not found for the use of fs- and ps-laser sources.