Abstract
Development of a titanium alloy having excellent hot forgeability and machinability while having the same properties as Ti-64 alloy is effective in reducing the total cost of titanium parts. To develop a new alpha-beta type titanium alloy which has good hot forgeability, machinability and tensile properties equivalent to those of Ti-64 alloy at room temperature, Ti-4.5Al-2.5Cr-1.2Fe-0.1C-nCu-nNi (n=0 to 2) were prepared and evaluated. The new alloy showed tensile properties equivalent to that of Ti-64 alloy at room temperature. On the other hand, the hot deformation stress of new alloy was about 30% lower than that of Ti-64 alloy, and the excellent deformability was confirmed. The addition of Cu and Ni to Ti-4.5Al-2.5Cr-1.2Fe-0.1C alloy suppressed the amount of wear of tool and improved the machinability. Tool life of new alloy machining is extended by about 1.5 times compared to that of Ti-64 alloy. Addition of Cu and Ni is considered to reduce the reactivity between tool and workpiece and improve machinability.
Highlights
The most common titanium alloy is Ti-6Al-4V alloy, which is widely used in many applications
Compared to Ti-64 alloy, equivalent tensile properties were obtained at room temperature
The hot deformation stress of new alloy was about 30% lower than that of Ti-64 alloy, and the excellent deformability was confirmed
Summary
The most common titanium alloy is Ti-6Al-4V alloy (hereafter Ti-64 alloy), which is widely used in many applications. Due to the high deformation resistance, forging die may not be filled with the material and desired shapes may not be obtained. To prevent these defects, there are necessity of increasing the input weight or increasing the number of heating times of forging and it leads to increasing costs of manufacturing. Development of a titanium alloy having excellent hot forgeability and machinability while having the same properties as Ti-64 alloy is effective in reducing the total cost of titanium parts. The EL-F alloy has good hot forgeability similar to commercially pure titanium and mechanical properties equivalent to those of Ti-64 alloy at room temperature [2, 3]. Since machinability of Ti-531C alloy was inferior to that of Ti64 alloy on some processing conditions, in this paper, further improvement of machinability was examined
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