In-situ measurement of continuous cooling beta ->alpha transformation behavior of CP-Ti

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The beta --> alpha transformation kinetics of CP-Ti during continuous cooling was measured using a fully computer-controlled resistivity-temperature real-time measurement apparatus. Unlike the pure Ti case, the massive transformation occurs at medium cooling rates, about 90 degreesC/s to 600 degreesC/s. Its start temperature is estimated to be about 890 degreesC, which is close to the To temperature. The reason for the appearance of massive transformation in CP-Ti is because CP-Ti contains a significant amount of Fe as an impurity, which leads to the T-0(beta --> alpha) vs composition curve being parallel to the composition axis due to its retrograde solubility. The martensitic transformation starts to occur at a cooling rate of about 500 degreesC/s, which is much slower than that (about 3000 degreesC/s) reported in a pure Ti case. This retardation effect of martensitic transformation is also believed to arise from the presence of Fe in CP-Ti, which is a strong beta stabilizer.
Publisher
MINERALS METALS MATERIALS SOC
Issue Date
2002-04
Language
English
Article Type
Article
Keywords

KINETICS; ALLOYS

Citation

METALLURGICAL AND MATERIALS TRANSACTIONS A-PHYSICAL METALLURGY AND MATERIALS SCIENCE, v.33, no.4, pp.1051 - 1056

ISSN
1073-5623
URI
http://hdl.handle.net/10203/78781
Appears in Collection
MS-Journal Papers(저널논문)
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