Influence of Material Microstructures in Micromilling of Ti6Al4V Alloy.
Influence of Material Microstructures in Micromilling of Ti6Al4V Alloy.
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DOI：
10.3390/ma6094268
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发表时间：
2013-09-24
期刊：
影响因子：
--
通讯作者：
Giardini C
中科院分区：
文献类型：
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作者：
Attanasio A;Gelfi M;Pola A;Ceretti E;Giardini C
近几十年来，非常规加工工艺的引入促进了微加工技术的发展。在这项工作中，材料的微观结构的影响，微铣削过程进行了研究。选择Ti6Al4V合金作为工件材料，因为它是用于微应用的非常常见的材料，并且因为其双相组织可以通过适当的热处理容易地改变。通过不同时间和温度的再结晶退火处理，获得了四种不同的显微组织（即双峰组织、完全等轴组织、完全层状组织和轧制退火组织）。通过显微硬度测量来评估样品的机械性能。还对单个晶粒进行了纳米压痕，以了解Ti6Al4V合金中存在的相和结构的不同硬度如何影响微铣削过程。使用直径等于200 µm的双槽平端米尔斯铣刀在经处理的样品上实现微通道。在测试期间使用两个不同的每齿进给量值。研究了切削力、通道形状和毛刺尺寸。通过扫描电子显微镜（SEM）对刀具进行了形态和能量色散谱（EDS）分析：通过这种方式，还确定了主要影响刀具状态的现象。较低的切削力和减少刀具磨损时，观察到工作的全层状显微组织相比，其他的。
In the most recent decades the introduction of unconventional machining processes allowed the development of micromachining techniques. In this work, the influence of material microstructures on the micromilling process was investigated. Ti6Al4V alloy was selected as workpiece material since it is a very common material for micro applications and because its duplex microstructure can be easily changed by proper thermal treatments. Four different microstructures (namely bimodal, fully equiaxed, fully lamellar and mill annealed) were obtained through recrystallization annealing treatments carried out at different times and temperatures. The mechanical properties of the samples were assessed by microhardness measurements. Nano-indentations were also performed on single grains to understand how the different hardness of phases and structures present in the Ti6Al4V alloy can affect the micromilling process. Microchannels using two flute flat end mills with a diameter equal to 200 µm were realized on the treated samples. Two different feed-per-tooth values were used during the tests. Cutting force, channel shape and burr dimension were investigated. Morphological and energy dispersive spectroscopy (EDS) analyses were performed on tools by means of a scanning electron microscope (SEM): in this way the phenomena mainly influencing the tool status were also identified. Lower cutting forces and reduced tool wear were observed when working fully lamellar microstructures compared to the other ones.