Anisotropy of Ti6Al4V Alloy Fabricated by Selective Laser Melting

doi:10.11901/1005.3093.2021.105

Chinese Journal of Materials Research

2022, Vol. 36

Issue (3): 231-240 DOI: 10.11901/1005.3093.2021.105

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Anisotropy of Ti6Al4V Alloy Fabricated by Selective Laser Melting

DIAO Wei, DU Lei, WANG Yanbo, ZHOU Haitao, SUN Jingli(

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Shanghai Spaceflight Precision Machinery Institute, Shanghai 201600, China

Cite this article:

DIAO Wei, DU Lei, WANG Yanbo, ZHOU Haitao, SUN Jingli. Anisotropy of Ti6Al4V Alloy Fabricated by Selective Laser Melting. Chinese Journal of Materials Research, 2022, 36(3): 231-240.

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Abstract

The microstructure, texture and properties of samples intercepted at different deposition heights and directions of the Ti6Al4V alloy fabricated by selective laser melting were investigated by metallographic analysis, XRD and tensile test. The results show that the vertical section parallel to the building direction presents microstructure of columnar-like prior-β grains filled with acicular martensite, while the cross section perpendicular to the building direction presents a block-like microstructure. The texture for the later cross section is stronger than that for the former one. The size of the columnar prior-β grains influences the mechanical properties along the building direction of the Ti6Al4V alloy fabricated by selective laser melting. The tensile strength and yield strength decrease first and then increase with the increase of deposition height, while the elongation variation has an opposite trend. The strength and plasticity of samples perpendicular to the building direction is higher than those parallel to the building direction due to the formed defects related with the weaker-texture and poor-fusion.

Key words: metallic materials anisotropy Ti6Al4V alloy selective laser melting

Received: 19 January 2021

ZTFLH:

TG146.23

Fund: National Natural Science Foundation of China(51701116);Shanghai Rising-Star Program(19QB1402000);Shanghai Sailing Program(19YF142000)

About author: SUN Jingli, Tel: (021)37842971, E-mail: sunjingli1221@126.com

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	Wei DIAO
	Lei DU
	Yanbo WANG
	Haitao ZHOU
	Jingli SUN

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https://www.cjmr.org/EN/10.11901/1005.3093.2021.105 OR https://www.cjmr.org/EN/Y2022/V36/I3/231

Table 1 Chemical composition of Ti6Al4V alloy powder produced by gas atomization method (mass fraction, %)

Fig.1 Laser scanning methods (a) and different diagrams showing different cross sections (b)

Fig.2 Schematic diagram of the tensile sample

Fig.3 SEM micrograph showing the morphology of the powder produced using gas atomization method

Fig.4 Microstructures of the cross sections of SLM-fabricated Ti6Al4V alloy (a) XY and (b) TOP

Fig.5 SEM micrographs showing typical microstructures of the cross sections of SLM-fabricated Ti6Al4V alloy (a) XY and (b) TOP

Fig.6 XRD spectrum of the original powder and the built block of Ti6Al4V alloy fabricated by SLM

Fig.7 Microstructures of SLM-fabricated Ti6Al4V alloy on the XZ vertical sections (a) and XY cross sections (b)

Fig.8 SEM micrographs showing typical microstructures of the XZ vertical section (a) and XY cross section (b) of SLM-fabricated Ti6Al4V alloy

Fig.9 XRD spectrum of different sections of SLM-fabricated Ti6Al4V alloy

Table 2 Lattice constants and the axial ratios of different phases on different sections

Table 3 The fractions of the phases on different sections

Table 4 Relative texture coefficient of each crystal planes on different sections (%)

Fig.10 The hardness on different cross sections of SLM-fabricated Ti6Al4V alloy

Fig.11 Hardness on different sections of SLM-fabricated Ti6Al4V alloy

Fig.12 Photos of tensile specimens (a) longitudinal specimens (L-XZ) and (b) horizontal specimens (T-XY)

Fig.13 Mechanical properties of SLM-fabricated Ti6Al-4V alloy

Fig.14 Microstructures of the XZ vertical section at the top (a), in the middle (b) and at the bottom (c)

Fig.15 SEM images showing the microstructures of XZ vertical sections at the top (a), at the middle (b), and at the bottom (c)

Fig.16 Mechanical properties of SLM-fabricated Ti6Al-4V alloy

Fig.17 Schematic diagram showing bonding defects in the as-deposited tensile specimens (a) L-XZ and (b) T-XY

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