Coated cemented carbide tool life extension accompanied by comb cracks: The milling case of 316L stainless steel
Coated cemented carbide tool life extension accompanied by comb cracks: The milling case of 316L stainless steel
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伴随梳状裂纹的涂层硬质合金刀具寿命延长：316L不锈钢铣削案例
DOI：
10.1016/j.wear.2018.11.019
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发表时间：
2019-01
期刊：
影响因子：
5
通讯作者：
Liu Shao-ping
中科院分区：
文献类型：
--
作者：
Zhang Li;Zhong Zhi-qiang;Qiu Lian-chang;Shi Hai-dong;Layyous Albir;Liu Shao-ping
在硬质合金基体上制备了两种典型的工业涂层：CVD多层TiN/MT-TiC 0. 7 N 0.3/TiCNO/α-Al 2 O3（cm-Al 2 O3基）和PVD纳米多层Al 0. 55 Ti 0. 45 N/TiN（pn-AlTiN基）。研究了316L不锈钢在坚韧铣削条件下的铣削性能、刀具失效机理和刀具寿命延长问题。结果表明，pn-AlTiN基涂层具有较强的抗分层、抗磨粒磨损和抗梳状裂纹扩展能力。结果表明，其刀具寿命是cm-Al_2 O_3基涂层的2.1倍。梳状裂纹演化导致的边缘剥落仍然是两种涂层的主要疲劳失效机制。用透射电子显微镜在尺寸为6.5 × 6.5 µm的FIB切割样品中观察到内部形成纵向亚微米至纳米级裂纹，伴随着AlTiN和TiN之间具有相干关系的清晰晶格条纹。pn-AlTiN基涂层抗梳状裂纹扩展能力强的原因在于其内部形成亚微米至纳米级裂纹的塑性变形自适应能力强，并具有较强的应力耗散能力。讨论了提高铣削刀具寿命的设计理念。
Two typical commercial coatings were deposited on a cemented carbide substrate, including CVD multilayered TiN/MT-TiC0.7N0.3/TiCNO/α-Al2O3(cm-Al2O3based) and PVD nano-multilayered Al0.55Ti0.45N/TiN (pn-AlTiN based). Performance and mechanisms for tool failure and tool life extension were investigated for the face milling of 316L stainless steel under a tough milling condition. The results show that the pn-AlTiN based coating exhibits a strong ability against delamination, abrasion wear and comb crack widening. As a result, its tool life is 2.1 times as long as the one with the cm-Al2O3based coating. Edge chipping resulted from comb crack evolution is still the dominated fatigue failure mechanism for both the coatings. Internal formation of longitudinal submicron to nano-scaled cracks, accompanied by clear lattice fringes with a coherent relation between AlTiN and TiN was observed in a FIB-cut specimen with a size of 6.5 × 6.5 µm with a transmission electron microscope. For the pn-AlTiN based coating, the strong ability against comb crack widening stems from its strong self-adaptive ability to plastic deformation through the internal formation of submicron to nano-scaled cracks and the associated strong stress dissipation ability. A design concept for improving the milling tool life is discussed.
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DOI：
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发表时间：
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影响因子：
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