THE STRUCTURE AND THE MECHANICAL PROPERTIES OF HIGH-ALLOY TITANIUM ALLOYS (in Russian)
The effect of heat treatment on the mechanical properties of Ti alloys used for the manufacture of forgings and hotrolled pipes, and containing Fe, Mn, Cr, and Al was investigated. Depending on the type of heat treatment used, these alloys may possess high strength, especially after age hardening. After forging and rolling, a beta + alpha + omega structure is obtained; the concentration of the omega phase is so low that it cannot be always shown by x- ray diffraction. Under the conditions used, eutectic transformation and beta + omega phases are observed. After soaking for 100 hours at temperatures of 400 to 500 and 600 deg C the system became embrittled; the Al-containing alloy showed a marked tendency toward embrittlement by eutectic transformations while Mn exerted an inhibiting effect. Upon quenching with water, the alpha phase which has low hardness, is formed; after heating for 15 to 20 hours the hardness increases, passing through a maximum. By age hardening at 400 and 550 deg C, the maximum hardness is reached with 15 to 30 minutes. This is due to the fact that at low temperatures omega phase precipitates out, while at 500 deg C this is followed by the precipitation of the alpha phase, resulting in the reduction of hardness. (TTT)
- Research Organization:
- Central Scientific Research Inst. of Ferrous Metals, USSR
- NSA Number:
- NSA-15-026592
- OSTI ID:
- 4002680
- Journal Information:
- Metalloved. i Termicheskaya Obrabotka Metal., Journal Name: Metalloved. i Termicheskaya Obrabotka Metal. Vol. Vol: No. 4
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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