Conclusions
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1.
The addition of carbon to titanium alloys leads to an increase of the ultimate strength and decrease of the impact toughness at 20°, with no change in the ductility. The largest increase in strength (14–18 kg/mm2) results from the addition of 0.05% C.
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2.
After holding for 100 h at 600° the ductility of the alloys with as much as 0.15% C is the same as in the original condition.
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3.
The addition of 0.05% C raises the ultimate strength of Ti 6.5Al 3Zr 2Mo by 7–10 kg/mm2 at 600°. The strength of the alloy without Mo decreases or remains the same when carbon is added.
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4.
The addition of 0.05–0.15% C to Ti 6.5Al 3Zr 2Mo leads to an increase of the long-term strength at 500 and 600°. The long-term strength of the alloy without Mo remains unchanged when carbon is added.
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5.
The addition of 0.05% C also reduces the grain size of α phase and raises the α+β→β transformation temperature.
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Literature cited
L. S. Moroz et al., Titanium and Its Alloys [in Russian], Sudpromgiz, Leningrad (1960).
Additional information
All-Union Scientific-Research Institute of Aviation Meterials. Translated from Metallovedenie i Termicheskaya Obrabotka Metallov, No. 4, pp. 28–30, April, 1974.
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Solonina, O.P., Ulyakova, N.M. Effect of carbon on the mechanical properties and structure of titanium alloys. Met Sci Heat Treat 16, 310–312 (1974). https://doi.org/10.1007/BF00679223
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DOI: https://doi.org/10.1007/BF00679223