Microstructure and tensile properties of laser melting deposited Ti–5Al–5Mo–5V–1Cr–1Fe near β titanium alloy

Liu, C.M.; Wang, H.M.; Tian, Xiangjun; Tang, Hao; Liu, D.

doi:10.1016/j.msea.2013.08.032

Cited by 127 publications

(39 citation statements)

References 30 publications

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“…LAM-fabricated titanium alloy is often distinguished by coarse, columnar prior β grains due to the high temperature gradients [11,12] and fine lamellar or lath-like microstructure within prior β grains as a result of the high cooling rate [13,14]. In addition, LAM-fabricated titanium alloys often exhibit high strength due to refined microstructure and low ductility due to the high level of residual stress [7,[15][16][17][18].…”

Section: Introductionmentioning

confidence: 99%

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

Song

Xie

et al. 2020

Materials

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Refining microstructure is an important issue for laser additive manufacturing (LAM) of titanium alloy. In the present work, the microstructures of LAM-fabricated Ti6Al4V alloy were refined using a low energy density with the combination of a small spot diameter, a low laser power, and a high scanning speed. The microstructure, hardness, wear performance, and molten pool thermal behavior of LAM-fabricated Ti6Al4V coatings were studied. The results show that the grain sizes of both prior β and α phases are strongly dependent on the cooling rate of the molten pool. The fine prior β grains and submicron-scale acicular α phases were obtained under a low energy density of 75 J mm−2 due to the high cooling rate of the molten pool. In addition, the as-fabricated Ti6Al4V sample with submicron-scale acicular α phase showed a very high hardness of 7.43 GPa, a high elastic modulus of 133.6 GPa, and a low coefficient of friction of 0.48. This work provides a good method for improving the microstructure and mechanical performance of LAM-fabricated Ti6Al4V alloy.

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Section: Introductionmentioning

confidence: 99%

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

Song

Xie

et al. 2020

Materials

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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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“…These processes apply extreme temperature gradientsto propagate the interface between the solid and liquid phases of the materialto form a new microstructure. The extreme environmental impacts on the material often result in the development of intrinsic defects that contribute to the degradation of the material strengthand limit the applications of these structural components [1][2][3][4].For standard solidification phenomena, multi-scale simulations provide us with a means to study the formation of these microstructures at an atomic scale, as well as the progression and impact of these defects through phase-field and finite element method simulations [5][6][7][8][9]. When these theories are applied to rapid solidification processes, the assumption of thermal equilibrium may not result in the most accurate representation of the physical state [10][11][12][13].This paper focuses on the atomic scale of the rapid solidification of aluminum through molecular dynamicswith the application of the capillary fluctuation method and an applied thermal gradient that drives the system out of equilibrium to capture the changes in the interface characteristics.…”

Section: Introductionmentioning

confidence: 99%

Interfacial free energy and stiffness of aluminum during rapid solidification

Brown

Martínez

2017

Acta Materialia

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Using molecular dynamics simulations and the capillary fluctuation method, we have calculated the anisotropic crystal-melt interfacial free energy and stiffness of aluminum in a rapid solidification system where a temperature gradient is applied to enforce thermal non-equilibrium. To calculate these material properties, the standard capillary fluctuation method typically used for systems in equilibrium has been modified to incorporate a second-order Taylor expansion of the interfacial free energy term. The result is a robust method for calculating interfacial energy, stiffness and anisotropy as a function of temperature gradient using the fluctuations in the defined interface height. This work includes the calculation of interface characteristics for temperature gradients ranging from 11~34 K/nm.The captured results are compared to a thermal equilibrium case using the same model and simulation technique with a zero gradient definition. We define the temperature gradient as the change in temperature over height perpendicular to the crystal-melt interface. The gradients are applied in MD simulations using defined thermostat regions on a stable solid-liquid interface initially in thermal equilibrium. The results of this work show that the interfacial stiffness and free energy for aluminum are dependent on the magnitude of the temperature gradient, however the anisotropic parametersremainindependent of the nonequilibrium conditionsapplied in this analysis. The relationships of the interfacial free energy/stiffness are determined to be linearly related to the thermal gradient, and can be interpolated to find material characteristics at additional temperature gradients.

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Microstructure and tensile properties of laser melting deposited Ti–5Al–5Mo–5V–1Cr–1Fe near β titanium alloy

Cited by 127 publications

References 30 publications

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

Enhancing Hardness and Wear Performance of Laser Additive Manufactured Ti6Al4V Alloy Through Achieving Ultrafine Microstructure

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

Interfacial free energy and stiffness of aluminum during rapid solidification

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