Effect of Heat Treatment on Mechanical Properties of Porous Ti55531 Alloy Prepared by Selective Laser Melting

doi:10.11900/0412.1961.2021.00313

Acta Metall Sin

2023, Vol. 59

Issue (5): 647-656 DOI: 10.11900/0412.1961.2021.00313

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Effect of Heat Treatment on Mechanical Properties of Porous Ti55531 Alloy Prepared by Selective Laser Melting

ZHANG Dongyang¹, ZHANG Jun¹, LI Shujun²(

), REN Dechun², MA Yingjie², YANG Rui²

¹College of Mechanical Engineering, Shenyang University, Shenyang 110044, China
²Shi -changxu Advanced Materials Innovation Center, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China

Cite this article:

ZHANG Dongyang, ZHANG Jun, LI Shujun, REN Dechun, MA Yingjie, YANG Rui. Effect of Heat Treatment on Mechanical Properties of Porous Ti55531 Alloy Prepared by Selective Laser Melting. Acta Metall Sin, 2023, 59(5): 647-656.

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Abstract

Lightweight metallic cellular components with high strength have received extensive interest because they are desirable for structural components. Previously, titanium alloy cellular structures were formed using additive manufacturing with the selective laser melting or electron beam melting technique. Numerous techniques have been developed to improve their strength. Most of these studies have focused on structure topology design. The relationship between the strength and mechanical properties of their strut parent materials has gained considerable attention. XRD, OM, SEM, and compression tests were used to investigate the effects of heat treatment on the microstructure and mechanical properties of Ti-5Al-5Mo-5V-3Cr-1Zr (Ti55531) alloy porous materials prepared through selective laser melting. The results show that the microstructure in struts consist of α and β phases after solution treatment at a temperature between 750^oC and 900^oC followed by an aging treatment at a temperature between 500^oC and 600^oC. The volume fraction of the primary α phase in the struts decreases as the solution temperature rises, whereas the volume fraction of the secondary α phase increases. The strut parent material's compressive strength increases but its elongation decreases, resulting in a decrease in toughness. With the increase of aging temperature, the shape, size, and volume fraction of the primary α phase in the strut do not change considerably, whereas the volume fraction of the secondary α phase decreases and the size increases. The strut parent material's compressive strength decreases while elongation increases, increa-sing toughness. The compressive strength of the examined porous alloy is strongly connected to the toughness of the parent material of the struts, which can be effectively improved by adjusting the strength and plasticity of the struts through heat treatment. The above results will guide the design of lightweight metallic cellular components with high strength.

Key words: Ti55531 alloy porous material selective laser melting heat treatment microstructure mechanical property

Received: 30 July 2021

ZTFLH:

TG146.23

Fund: National Natural Science Foundation of China(51871220);National Natural Science Foundation of China(51631007);Natural Science Foundation of Liaoning Province(LACT-007);Opening Project of National Key Laboratory of Shock Wave and Detonation Physics(2022JCJQLB05702)

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	ZHANG Dongyang
	ZHANG Jun
	LI Shujun
	REN Dechun
	MA Yingjie
	YANG Rui

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https://www.ams.org.cn/EN/10.11900/0412.1961.2021.00313 OR https://www.ams.org.cn/EN/Y2023/V59/I5/647

Table 1 Heat treatment processes of porous Ti55531 specimens

Fig.1 SEM image (a) and particle size distribution (b) of the Ti55531 alloy powders

Fig.2 Porous structure models (a, b) and selective laster melting (SLM) fabricated specimen (c) of porous Ti55531 alloy

Fig.3 XRD spectra of the as-fabricated and heat treated porous Ti55531 specimens

Fig.4 Cross-sectional OM (a) and SEM (b) images of the as-fabricated porous Ti55531 specimen

Fig.5 Low (a) and high (b) magnified surface SEM images of the as-fabricated porous Ti55531 specimen

Fig.6 OM images of the porous Ti55531 specimens after solution treated at different temperatures for 1 h followed by aging at 500^oC for 4 h
(a) without solution treatment (b) 750^oC (c) 800^oC (d) 900^oC

Fig.7 Low (a, c, e, g) and high (b, d, f, h) magnified SEM images of the porous Ti55531 specimens after solution treated at different temperatures for 1 h followed by aging at 500^oC for 4 h ( α_p—primary α, α_s—secondary α )
(a, b) without solution treatment (c, d) 750^oC (e, f) 800^oC (g, h) 900^oC

Table 2 Phase volume fractions contained in the porous Ti55531 specimens after different heat treatments

Fig.8 OM images of the porous Ti55531 specimens after solution treated at 800^oC for 1 h followed by aging at 500^oC (a) and 600^oC (b) for 4 h

Fig.9 Low (a, c) and high (b, d) magnified SEM images of the porous Ti55531 specimens after solution treated at 800^oC for 1 h followed by aging at 500^oC (a, b) and 600^oC (c, d) for 4 h

Fig.10 Compressive stress-strain curves (a) and compressive strength (b) of the porous Ti55531 parent materials after different heat treatments

Fig.11 Compressive stress-strain curves (a) and compressive strength (b) of the porous Ti55531 specimens after different heat treatments

Fig.12 Compression fracture energies of the parent materials of porous Ti55531 specimens after different heat treatments

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