Exploring the Heat Treatment Parameters, Microstructural Evolution, and Mechanical Properties of Ti–6Al–4V Alloy Fabricated by a Selective Laser Melting Process

Xing Gao; Ning Zhang; Yi Zhang; Mingrui Chen; Yan Ding; Bo Jiang; Yazheng Liu

doi:10.1007/s12540-022-01170-3

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자료유형: 학술저널

저자정보: Xing Gao (University of Science and Technology Beijing) Ning Zhang (University of Science and Technology Beijing) Yi Zhang (University of Science and Technology Beijing) Mingrui Chen (University of Science and Technology Beijing) Yan Ding (Zhonghang Jiuyuan Keji (Beijing) Co. Ltd) Bo Jiang (University of Science and Technology Beijing) Yazheng Liu (University of Science and Technology Beijing)

저널정보: 대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.28 No.11

발행연도: 2022.11

수록면: 2,596 - 2,612 (17page)

DOI: 10.1007/s12540-022-01170-3

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The effects of heat treatment parameters on the mechanical properties of a selective laser melting Ti–6Al–4V alloy werestudied using an L9 (34) type orthogonal test. Results showed that the solution temperature and aging temperature were themost influential factors relative to the mechanical properties. The optimum heat treatment was then obtained as 920 °C/2 h/water quenching + 550 °C/3 h/air cooling and the corresponding tensile strength was 1045.2 MPa and the elongation was13.6%. Compared to a solution temperature of 850 °C, more fine secondary α phase (αS) and higher geometrically necessarydislocations (GND) density were obtained when solution temperature was 920 °C, which promoted the increased strengthby increasing the interface strengthening effect of αS/β and the dislocation strengthening. However, the microstructure of thecontinuously coarsening αGB resulted in decreased elongation when the solution was at 920 °C. As the aging temperatureincreased from 550 to 650 °C, the GND density was reduced and the microstructures of primary α (αP), αS with variouscrystallographic orientations, lamellar α, and equiaxial αP were coarsened. Therefore, the elongation of the specimen agingat a higher aging temperature increased while the strength decreased.

#Selective laser melting · Ti–6Al–4V alloy · Orthogonal experiment · Solution temperature · Aging temperature

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