Preparation of pure tungsten via various rolling methods and their influence on macro-texture and mechanical properties

Zhang, Xiaoxin; Yan, Qingzhi; Lang, Shaoting; Wang, Yijia; Chen, Ge

doi:10.1016/j.matdes.2017.04.021

Cited by 35 publications

(15 citation statements)

References 44 publications

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“…Referring to Table 3 , when we compared the value of HV (microhardness) with other specimens of tungsten, it was found that the results are quite better as compared with the other manufacturing techniques. Similarly, when the ultimate compressive stress of SLM specimens was compared with other specimens, especially with the chemical vapor deposition (CVD) technique [ 14 ], it was realized that the laser melting technique is also good for ultimate tensile stress (UCS). In the SLM approach, high densification without massive cracks or pores will produce and this reasonable level of residual stress in laser melting parts may cause an increase in hardness and dislocation strength.…”

Section: Resultsmentioning

confidence: 99%

On the Use of EBSD and Microhardness to Study the Microstructure Properties of Tungsten Samples Prepared by Selective Laser Melting

2021

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Additively manufactured tungsten and its alloys have been widely used for plasma facing components (PFCs) in future nuclear fusion reactors. Under the fusion process, PFCs experience a high-temperature exposure, which will ultimately affect the microstructural features, keeping in mind the importance of microstructures. In this study, microhardness and electron backscatter diffraction (EBSD) techniques were used to study the specimens. Vickers hardness method was used to study tungsten under different parameters. EBSD technique was used to study the microstructure and Kikuchi pattern of samples under different orientations. We mainly focused on selective laser melting (SLM) parameters and the effects of these parameters on the results of different techniques used to study the behavior of samples.

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Section: Resultsmentioning

confidence: 99%

On the Use of EBSD and Microhardness to Study the Microstructure Properties of Tungsten Samples Prepared by Selective Laser Melting

2021

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“…Tungsten (W), as the highest melting point refractory metal, has many unique physical and chemical properties, including high density, high thermal conductivity, high recrystallization temperature, low thermal expansion, and high strength and hardness at room and elevated temperatures. Tungsten and its alloys have been applied in numerous fields, including as lighting engineering, electronics, manufacturing, aerospace, military, medical field, and especially nuclear field [ 1–4 ]. For example, tungsten is of interest to the nuclear industry as a promising candidate for plasma-facing materials (PFM) in future nuclear fusion devices such as the International Thermonuclear Experimental Reactor (ITER) and high-performance rocket nozzles, as intensive transient heat loads must be withstood alongside the requirements of limited tritium retention, and handling enormous particle ﬂux of hydrogen, helium and neutrons [ 1,5,6 ].…”

Section: Introductionmentioning

confidence: 99%

Selective laser melting of high-performance pure tungsten: parameter design, densification behavior and mechanical properties

Tan

Zhou

et al. 2018

Science and Technology of Advanced Materials

138

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Selective laser melting (SLM) additive manufacturing of pure tungsten encounters nearly all intractable difficulties of SLM metals fields due to its intrinsic properties. The key factors, including powder characteristics, layer thickness, and laser parameters of SLM high density tungsten are elucidated and discussed in detail. The main parameters were designed from theoretical calculations prior to the SLM process and experimentally optimized. Pure tungsten products with a density of 19.01 g/cm3 (98.50% theoretical density) were produced using SLM with the optimized processing parameters. A high density microstructure is formed without significant balling or macrocracks. The formation mechanisms for pores and the densification behaviors are systematically elucidated. Electron backscattered diffraction analysis confirms that the columnar grains stretch across several layers and parallel to the maximum temperature gradient, which can ensure good bonding between the layers. The mechanical properties of the SLM-produced tungsten are comparable to that produced by the conventional fabrication methods, with hardness values exceeding 460 HV0.05 and an ultimate compressive strength of about 1 GPa. This finding offers new potential applications of refractory metals in additive manufacturing.

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“…Compared with UHR, although the deformation pattern of CHR is similar to that of it, the transition of rolling direction makes the field state exchange dramatically, and the difference of mechanical properties in both vertical and horizontal orientations is also compensated apparently. However, the genetic pattern of these characteristic field quantities does not seem to be clear in the current researches [23][24], which needs further exploration and exploitation. In order to reduce the rolling scrap caused by manual experience and to increase the yield of molybdenum sheet, it is necessary to systematically study the formation of sheet by means of computer design and parameters optimization.…”

Section: Introductionmentioning

confidence: 90%

Finite Element Analysis of Large Plastic Deformation Process of Pure Molybdenum Plate During Hot Rolling

Peng

Cheng

Xing

et al. 2021

Preprint

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Rare molybdenum resources have been increasingly involved in heavy industries. In this paper, the common unidirectional and cross hot rolling operations, for pure molybdenum plate, are numerically simulated by using MSC. Marc software. An elastic-plastic finite element model is employed together with updated Lagrange method to predict stress and strain fields in the work-piece. The results showed that there was a typical three-dimensional additional compressive stress ( σy > σx > σz ) in deformation zone, while strain could be divided into uniaxial compressive strain and biaxial tensile strain ( Ey > Ex > Ez ). Tensile stress σx increased with the accumulation of reduction and the decrease of friction coefficient at the edge of width spread. More importantly, the interlaced deformation caused by cross commutation was helpful to repair the severe anisotropy created by unidirectional hot rolling. By comparing the theoretical verification of rolling forces and the measured temperatures with the simulated values, eventually, it is demonstrated that the model is aligning well with the actual engineering.

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Preparation of pure tungsten via various rolling methods and their influence on macro-texture and mechanical properties

Cited by 35 publications

References 44 publications

On the Use of EBSD and Microhardness to Study the Microstructure Properties of Tungsten Samples Prepared by Selective Laser Melting

On the Use of EBSD and Microhardness to Study the Microstructure Properties of Tungsten Samples Prepared by Selective Laser Melting

Selective laser melting of high-performance pure tungsten: parameter design, densification behavior and mechanical properties

Finite Element Analysis of Large Plastic Deformation Process of Pure Molybdenum Plate During Hot Rolling

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