Grindability of cast Ti-Cu alloys.
Grindability of cast Ti-Cu alloys.
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DOI：
10.1016/s0109-5641(02)00080-5
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发表时间：
2003-07
期刊：
影响因子：
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通讯作者：
M. Kikuchi;Y. Takada;S. Kiyosue;M. Yoda;M. Woldu;Z. Cai;O. Okuno;T. Okabe
中科院分区：
文献类型：
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作者：
M. Kikuchi;Y. Takada;S. Kiyosue;M. Yoda;M. Woldu;Z. Cai;O. Okuno;T. Okabe
本研究的目的是评价一系列铸造钛铜合金的可磨性，以开发一种比商业纯钛（CP Ti）具有更好可磨性的钛合金，商业纯钛被认为是最难加工的金属之一。（0.5、1.0、2.0、5.0和10.0质量%的Cu）在氩弧熔化炉中制备。使用离心铸造机将每种合金铸造到氧化镁模具中。用碳化硅砂轮在电动机上以0.98N（100 gf）、500、750、1000和1250 m/min四种圆周速度对去除硬化层（250μm）的3.5mm×8.5mm×30.5mm铸造合金板进行磨削。通过测量研磨1分钟后去除的金属体积的量来评价可研磨性。结果Ti-10%Cu合金在各种转速下的可磨性最好。对于具有2%或更少的Cu含量的Ti-Cu合金，最高的可磨削性对应于中等速度。结果表明，在圆周速度为1000 m/min或更高时，随着Cu含量的增加，铸钛的可磨性比纯钛提高，尤其是Cu含量为5%或10%的铸钛。在α-基体晶粒中连续析出的Ti 2Cu使该材料的延展性降低，并有利于更有效的磨削，因为更容易形成小的破碎段。
ObjectivesThe purpose of the present study was to evaluate the grindability of a series of cast Ti–Cu alloys in order to develop a titanium alloy with better grindability than commercially pure titanium (CP Ti), which is considered to be one of the most difficult metals to machine.MethodsExperimental Ti–Cu alloys (0.5, 1.0, 2.0, 5.0, and 10.0mass% Cu) were made in an argon-arc melting furnace. Each alloy was cast into a magnesia mold using a centrifugal casting machine. Cast alloy slabs (3.5mm×8.5mm×30.5mm), from which the hardened surface layer (250μm) was removed, were ground using a SiC abrasive wheel on an electric handpiece at four circumferential speeds (500, 750, 1000, or 1250m/min) at 0.98N (100gf). Grindability was evaluated by measuring the amount of metal volume removed after grinding for 1min. Data were compared to those for CP Ti and Ti–6Al–4V.ResultsFor all speeds, Ti–10% Cu alloy exhibited the highest grindability. For the Ti–Cu alloys with a Cu content of 2% or less, the highest grindability corresponded to an intermediate speed. It was observed that the grindability increased with an increase in the Cu concentration compared to CP Ti, particularly for the 5 or 10% Cu alloys at a circumferential speed of 1000m/min or above.SignificanceBy alloying with copper, the cast titanium exhibited better grindability at high speed. The continuous precipitation of Ti2Cu among the α-matrix grains made this material less ductile and facilitated more effective grinding because small broken segments more readily formed.