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The optimal determination of forging process parameters for Ti–6.5Al–3.5Mo–1.5Zr–0.3Si alloy with thick lamellar microstructure in two phase field based on P-map by X. Li; S.Q. Lu; M.W. Fu; K.L. Wang; X.J. Dong is a Engineering article available to read on EtoBox.

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The deformation behavior of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy with thick lamellar ␣ microstructure is investigated by using the Processing-map (P-map). The results show that the P-map can predict the regime of flow instability and reveal deformation mechanisms well. Through analyzing P-maps and observing the microstructure evolution of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy in forging process, the phenomena of flow instability are found to occur at the temperature and strain rate ranges of (750-880 • C, 0.005-10.0 s -1 ) and (880-950 • C, 0.17-10.0 s -1 ), which include macrocracks, adiabatic shear bands and prior ␤ boundary cavities. The preferable temperature and strain rate for hot working of the Ti-alloy are (790-900 • C, 0.001-0.003 s -1 ) and (900-950 • C, 0.001-0.017 s -1 ). In these two deformation domains, the globularization of ␣ lamellae occurs, and the combination of the globularization of ␣ lamellae and ␣ + ␤ → ␤ phase transformation happen, respectively. For forging of Ti-6.5Al-3.5Mo-1.5Zr-0.3Si alloy in ␣ + ␤ phase field, the optimum temperature can be selected from the temperature range of 850-950 • C and the optimum stain rate is 0.001 s -1 based on the volume fraction of

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Author

X. Li; S.Q. Lu; M.W. Fu; K.L. Wang; X.J. Dong

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0924-0136)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)