| Issue |
MATEC Web Conf.
Volume 321, 2020
The 14th World Conference on Titanium (Ti 2019)
|
|
|---|---|---|
| Article Number | 11073 | |
| Number of page(s) | 8 | |
| Section | Microstructure - Properties Relationships | |
| DOI | https://doi.org/10.1051/matecconf/202032111073 | |
| Published online | 12 October 2020 | |
Development of α - β type titanium alloy Ti-4.5Al-2.5Cr-1.2Fe-0.1C-0.3Cu-0.3Ni having good forgeability and machinability
1 Titanium Research & Development section, Titanium division, Kobe steel, Ltd., Japan konno.takashi@kobelco.com
2 Titanium Research & Development section, Titanium division, Kobe steel, Ltd., Japan
3 Mechanical Working Research Section, Material Research Laboratory, Kobe steel, Ltd., Japan
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.
Key words: alpha-beta type titanium alloy (α-β type titanium alloy) / hot forging / machining
© The Authors, published by EDP Sciences, 2020
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