Abstract
The β → α 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 °C/s to 600 °C/s. Its start temperature is estimated to be about 890 °C, which is close to the T 0 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(β → α) 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 °C/s, which is much slower than that (about 3000 °C/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 β stabilizer.
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Kim, S.K., Park, J.K. In-situ measurement of continuous cooling β → α transformation behavior of CP-Ti. Metall Mater Trans A 33, 1051–1056 (2002). https://doi.org/10.1007/s11661-002-0206-2
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DOI: https://doi.org/10.1007/s11661-002-0206-2