Microstructural characterization of laser melting deposited Ti–5Al-5Mo–5V–1Cr–1Fe near β titanium alloy

Liu, C.M.; Tian, Xiangjun; Tang, Hai Bo; Wang, H.M.

doi:10.1016/j.jallcom.2013.03.243

Cited by 145 publications

(37 citation statements)

References 26 publications

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“…Unlike traditional manufacturing methods such as casting, laser melting deposition produces full density near-net-shape components from powder with shorter manufacturing cycle and higher material utilization rate where no forming equipment is necessary. TC18 titanium alloy with the nominal composition of Ti-5Al-5Mo-5V-1Cr-1Fe alloy is a near b-type titanium alloy which is superior as aircraft structural material [3]. With high strength after annealing among existing titanium alloys, it has excellent long-term work performance below 350°C (B10,000 h) [4].…”

Section: Introductionmentioning

confidence: 99%

Sliding wear behavior of laser-nitrided and thermal oxidation-treated Ti–5Al–5Mo–5V–1Cr–1Fe alloy fabricated by laser melting deposition

Liu

Shangguan

et al. 2016

Appl. Phys. A

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Sliding wear behavior of laser-nitrided and thermal oxidation-treated Ti-5Al-5Mo-5V-1Cr-1Fe (TC18) alloy fabricated by laser melting deposition (LMD) has been investigated to improve on wear resistance of laser melting deposited titanium alloy. The microstructure, wear morphology, hardness and wear rate were examined for the unmodified, laser-nitrided and thermal oxidationtreated LMD Ti-5Al-5Mo-5V-1Cr-1Fe alloy. As compared to a/b basket weave microstructure with fine lamellar a (hcp) observed on the unmodified LMD Ti-5Al-5Mo-5V-1Cr-1Fe alloy, Ti, Ti 2 N and TiN were formed on the LMD specimens after laser nitriding. After thermal oxidation, a surface layer composed of rutile TiO 2 was formed on the LMD specimens along with coarsening of a lath. The increase in hardness and wear resistance of the lasernitrided LMD Ti-5Al-5Mo-5V-1Cr-1Fe alloy is attributed to hard dendritic TiN formed on the specimens. The wear rate of the thermal oxidation-treated LMD specimens was \1 % of that of the unmodified LMD specimens when hardness of the former was twice as much as the latter. The superior sliding wear resistance of the thermal oxidationtreated LMD specimens is attributed to the presence of the lubricious rutile oxide layer and hardened diffusion zone.

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Section: Introductionmentioning

confidence: 99%

Sliding wear behavior of laser-nitrided and thermal oxidation-treated Ti–5Al–5Mo–5V–1Cr–1Fe alloy fabricated by laser melting deposition

Liu

Shangguan

et al. 2016

Appl. Phys. A

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“…However, the variation trends in the grain structure between equiaxed grains and columnar grains with the processing parameters (such as laser power, scanning speed and powder feed rate) could still be observed for these alloys, suggesting that the thermal history, which is controlled by processing parameters, is another determining factor for the microstructural development in DLD. Liu et al [18] investigated the response of T i-5Al-5Mo-5V-1Cr-1Fe to DLD and found that the as-fabricated microstructure contained a mixture of columnar grains and equiaxed grains which laid out in the form of a sandwich structure. They also recognised the inhomogeneous thermal distribution throughout the builds during DLD but did not investigate the microstructure in different regions (e.g.…”

Section: Introductionmentioning

confidence: 99%

Microstructural control during direct laser deposition of a β-titanium alloy

2015

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a b s t r a c tA concern associated with Direct Laser Deposition (DLD) is the difficulty in controlling microstructure due to rapid cooling rates after deposition, particularly in beta-Ti alloys. In these alloys, the beta-phase is likely to exist following DLD, instead of the desirable duplex alpha + beta microstructure that gives a good balance of properties. Thus, in this work, a parametric study was performed to assess the role of DLD parameters on porosity, build geometry, and microstructure in a beta-Ti alloy, Ti-5Al-5Mo-5V-3 Cr (Ti5553). The builds were examined using optical microscopy, scanning electron microscopy, and X-ray diffraction. Microhardness measurements were performed to assess the degree of re-precipitation of alpha-phase following an in situ dwelling and laser annealing procedure. The study identified several processing conditions that enable deposition of samples with the desired geometry and low porosity level. The microstructure was dominated by beta-phase, except for the region near the substrate where a limited amount of alpha-precipitates was present due to reheating effect. Although the microstructure was a mixture of equiaxed and columnar beta-grains alongside infrequent fine alpha-precipitates, the builds showed fairly uniform microhardness in different regions. In situ dwelling and annealing did not cause an obvious change in porosity, but did promote the formation of alpha-precipitates.

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“…During the SLM process, the under deposited part had a lower temperature and high thermal conductivity, which led to heat dissipation being fastest in the Z direction. On the other hand, the grain tended to grow epitaxially along the original crystallographic orientation, associating crystallization [15][16][17]. From the SEM micrograph of a higher magnification on the longitudinal cross-section (Fig.…”

Section: Advances In Engineering Research (Aer) Volume 102mentioning

confidence: 99%

Effects of Hot Isostatic Pressing on Microstructure and Mechanical Properties of Hastelloy X Samples Produced by Selective Laser Melting

Li¹,

Qi²,

Hou³

et al. 2017

Proceedings of the Second International Conference on Mechanics, Materials and Structural Engineering (ICMMSE 2017)

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Abstract. Hot isostatic pressing (HIP) with two different temperatures of 1100○ C/160MPa/2h and 1175 ○ C/160 MPa/2 h was performed on Hastelloy X samples produced by selective laser melting (SLM) was performed. The effect of hot isostatic pressing on defects, microstructures and mechanical properties of SLM fabricated Hastelloy X samples were investigated. It showed that cracks and micro-pores on within SLM-fabricated samples were gradually eliminated with the increase of HIP temperatures, increased A in which nearly fully dense part can be achieved at hot isostatic pressing of 1175 ○ C /160 MPa/2 h. The microstructure evolution rule as follows: cellular crystal in both horizon and vertical directions, no precipitates (as-deposited) → equiaxed crystal with size of 10-50 μm in horizon direction and columnar crystal with size of 200μm in vertical direction, chain-like precipitates distributed at grain boundaries (1100 ○ C/160 MPa/2 h HIP processed) → equiaxed crystal with size of 150 μm in both horizon and vertical directions, plate-like precipitates distributed at grain boundaries with size triple increased (1175 ○ C/160 MPa/2 h HIP processed). Ductile fracture occurred in both SLM deposited and HIP processed samples during room temperature tensile tests, while all tested samples behaved higher mechanical properties than traditional wrought parts. The room temperature tensile properties of the as-deposited and the two HIP processed samples all reached the standard for wrought Hastelloy X. Moreover, the ductility of HIP processed samples enhanced and tensile properties decreased compared with SLM deposited samples.

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Microstructural characterization of laser melting deposited Ti–5Al-5Mo–5V–1Cr–1Fe near β titanium alloy

Cited by 145 publications

References 26 publications

Sliding wear behavior of laser-nitrided and thermal oxidation-treated Ti–5Al–5Mo–5V–1Cr–1Fe alloy fabricated by laser melting deposition

Sliding wear behavior of laser-nitrided and thermal oxidation-treated Ti–5Al–5Mo–5V–1Cr–1Fe alloy fabricated by laser melting deposition

Microstructural control during direct laser deposition of a β-titanium alloy

Effects of Hot Isostatic Pressing on Microstructure and Mechanical Properties of Hastelloy X Samples Produced by Selective Laser Melting

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