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Material Response at Tool-Chip Interface and Its Effects on Tool Wear in Turning Inconel718

机译：Inconel718车削中刀具-芯片界面的材料响应及其对刀具磨损的影响

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摘要

Because nickel-based alloy Inconel718 has poor thermal conductivity and serious work hardening, it is identified as a difficult-to-process material. The serious tool wear leads to short tool life. In this study, physical vapor deposition-coated carbide tools were used to machine Inconel718. The material response for different cutting speeds at the tool-chip interface and its effect on tool wear were studied. The results showed that at low cutting speed (v (c)=20m/min), cold welding and adhesion occurred at the tool-chip interface under high stress, and then the built-up edge (BUE) formed. The peeling off of BUE led to chipping. When the cutting speed (v (c)) was 45m/min, diffusion and oxidation occurred at the tool-chip interface. The new generated material reduced tool hardness and bond strength of Co. The wear debris was generated in tool rake face. Flakes of wear debris fell from the tool substrate, which increased tool wear. When the cutting speed was 32m/min, the softer oxides generated at the tool-chip interface served as a boundary lubrication layer. They can effectively weaken the adhesion between tool and chip, which made the chemical wear and adhesive wear reach equilibrium. Furthermore, the friction coefficient is reduced. Tool wear is reduced under this cutting condition.
机译：由于镍基合金Inconel718的导热性差且加工硬化严重，因此被确定为难加工材料。严重的刀具磨损会导致刀具寿命缩短。在这项研究中，使用物理气相沉积涂层硬质合金刀具加工Inconel718。研究了刀具-切屑界面处不同切削速度下的材料响应及其对刀具磨损的影响。结果表明，在低切削速度（v（c）= 20m / min）时，在高应力下刀具-芯片界面发生冷焊和粘结，然后形成堆积边缘（BUE）。 BUE的剥落导致碎裂。当切削速度（v（c））为45m / min时，在工具-切屑界面处发生扩散和氧化。新产生的材料降低了刀具的硬度和Co的结合强度。刀具前刀面产生了磨损碎片。磨损碎片的碎片从工具基材上掉落，这增加了工具的磨损。当切削速度为32m / min时，在工具-切屑界面产生的较软的氧化物用作边界润滑层。它们可以有效地削弱工具与切屑之间的附着力，从而使化学磨损和粘合剂磨损达到平衡。此外，减小了摩擦系数。在这种切削条件下可减少刀具磨损。

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