Effect of heat treatment on microstructure and mechanical properties of TC4 alloy plate directly rolled by EB ingot

doi:10.13251/j.issn.0254-6051.2022.09.013

Abstract

Abstract: TC4 titanium alloy ingot cast by electron beam cooling bed furnace were rolled for three times to obtain plates of different thicknesses. The effect of different annealing temperatures (750, 780, 810 and 850 ℃) on microstructure and mechanical properties of the plates was studied. The results show that the microstructure of single reheat rolled sheet is not sufficiently fragmented, and the morphology of primary α phase can't be significantly changed by increasing the annealing temperature. After double reheat rolling and triple reheat rolling, the original lamellar structure is gradually fragmented completely, and the ratio of the primary equiaxed α phase is correspondingly increased. With the increase of annealing temperature, the primary α phase of double reheat rolled plates spheroidizes gradually, and the primary α phase of triple reheat rolled plates begins to grow gradually at 780 ℃, and the secondary α phase shows a tendency of thickening and widening. The comprehensive analysis reveals that after the single reheat rolled plates annealed at 810 ℃, the double reheat rolled plates annealed at 840 ℃, and the triple reheat rolled plates annealed at 750 ℃, a good combination of strength and plasticity is obtained. By analyzing the fracture morphology of the corresponding alloy plates, both the room temperature fracture mechanism and the high temperature fracture mechanism are typical ductile fracture.

Key words: TC4 titanium alloy, rolling times, annealing temperature, microstructure evolution, mechanical properties

CLC Number:

TG156.21

Zhang Haoze, Wang Junsheng, Gong Penghui, Zhan Haiyi, Wang Kai. Effect of heat treatment on microstructure and mechanical properties of TC4 alloy plate directly rolled by EB ingot[J]. Heat Treatment of Metals, 2022, 47(9): 71-78.

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