Die-less manufacturing of tube by diffusion bonding of unit rods made of tungsten heavy alloy

Park, Zu Seong; Tyne, C. J. Van; Kim, Jeong; Hwang, Taehyun; Kim, Yangjin; Moon, Young Hoon

doi:10.1007/s00170-019-04668-0

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…Before pouring, the mold was preheated to an initial temperature of 80 C. To ensure product quality and operational performance, it is very important to obtain accurate temperature measurements and to control the temperature during the thermal process. [27][28][29][30][31][32] The facilities (in Taewoong Co., Ltd., Korea) for the CC process used to manufacture the round bloom included an electric arc furnace (EAF) and a ladle furnace (LF) along with equipment for vacuum degassing (VD), vacuum oxygen decarburization (VOD), and CC. [4] Figure 1 shows a schematic of the CC process used to obtain the round bloom.…”

Section: Methodsmentioning

confidence: 99%

Feasibility of using Continuously Cast Round Bloom as a Substitute to Cast Ingot in the Manufacture of Heavy Forgings

Kim

Kang

et al. 2020

steel research int.

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Continuously cast large round blooms have gained widespread attention due to the improved quality, enhanced economy, higher yields, and lower operating costs obtained through continuous operation. Because the continuous casting (CC) process combines the cleanliness and radial solidification symmetry of the ingot casting process with the higher axial symmetry obtainable through bloom casting, it can deliver a more homogeneous product than conventional ingot casting. Herein, the shop floor manufacturing of a main shaft is discussed to confirm the feasibility of using continuously cast round bloom in the manufacture of heavy forgings. For comparison, the characteristics of a 1000 mm‐diameter continuously cast round bloom are assessed against those of a conventionally cast 20.6 ton ingot. To eliminate cavities at the centerline of the cylindrical bloom, additional studies on void closure efficiency at the center of the billet under various forging die geometries (e.g., flat, V, and round dies) are conducted, and the results reveal that the V‐die geometry is most effective in consolidating centerline voids. A comparison of the respective operational characteristics reveals that the round bloom CC method could be feasibly applied in the manufacture of main shafts.

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Section: Methodsmentioning

confidence: 99%

Feasibility of using Continuously Cast Round Bloom as a Substitute to Cast Ingot in the Manufacture of Heavy Forgings

Kim

Kang

et al. 2020

steel research int.

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“…In the fabrication of long tubular parts, a vertical type diffusion bonding system has been specially designed to conduct the following functions. Accurate measurement and control of temperature in high temperature processes are crucial and must be prioritized to maintain system performances [29][30][31][32][33]. Figure 3 schematically shows the diffusion bonding system developed in this study.…”

Section: System Design To Fabricate Long Tubular Productsmentioning

confidence: 99%

System Development for Diffusion Bonding of Multiple Unit Tubes to Produce Long Tubular Tungsten Heavy Alloys

Park¹,

Woo

Han

et al. 2020

Applied Sciences

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A diffusion bonding system to fabricate long tubular parts by joining of two- or more-unit tubes made of tungsten heavy alloys (THAs) is proposed and characterized in this study. The difficulty of powder processing of THA originates from the weak strength of the green compact and the high weight of the THA powders. The long tubular green compact is difficult to handle due to its weak structural integrity. Furthermore, gravity-induced slumping during liquid phase sintering induces dimensional distortion and degrades the mechanical performances. As a clue for solving these problems, the unit tubes are fabricated. However, the mass of green compacts for unit tubes is not sufficiently great as to cause problematic slumping; tubular unit tubes can be obtained without significant difficulty. Fabricated unit tubes are stacked in a furnace chamber and diffusion-bonded to produce a long tubular part having bond strength substantially equal to that of a monolithic tube. The proposed diffusion bonding system was well characterized and successfully applied to the industrial production line. The feasibility was also confirmed by investigating the bond quality, which can be assessed by metallographic microstructure and mechanical property.

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Sintering of Cold Spray Additively Manufactured Aluminum 6061

2021

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Die-less manufacturing of tube by diffusion bonding of unit rods made of tungsten heavy alloy

Cited by 3 publications

References 35 publications

Feasibility of using Continuously Cast Round Bloom as a Substitute to Cast Ingot in the Manufacture of Heavy Forgings

Feasibility of using Continuously Cast Round Bloom as a Substitute to Cast Ingot in the Manufacture of Heavy Forgings

System Development for Diffusion Bonding of Multiple Unit Tubes to Produce Long Tubular Tungsten Heavy Alloys

Sintering of Cold Spray Additively Manufactured Aluminum 6061

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