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vacuum hot pressing
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Published: 01 July 2009
Fig. 19.9 Illustration of relative material movement during vacuum hot pressing of beryllium powder in a die. (a) Vibrated powder column with bands of beryllium powder alternating with bands of beryllium plus additive powder. (b) Vacuum hot pressed compact at +99.5% of theoretical density
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Published: 01 October 2012
Fig. 4.5 Effects of compaction method on properties of S-200. VHP, vacuum hot press; HIP, hot isostatic press; YS, yield strength; UTS, ultimate tensile strength; L, longitudinal; T, transverse. Source: Ref 4.2
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Published: 01 December 2000
Fig. 9.12 Vacuum hot press used for diffusion bonding of turbofan disks and/or hubs. Courtesy of Pratt & Whitney Aircraft Group
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Published: 01 July 2009
Fig. 4.15 Low-temperature thermal expansion, ΔL/L 300 K , for vacuum hot pressed S-200F relative to 300 K (27 °C). Source: Haws 1988
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Published: 01 July 2009
Fig. 11.2 Modulus of rupture of vacuum hot-pressed Ta 2 Be 17 as a function of temperature. Source: Stonehouse et al. 1960
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Published: 01 July 2009
Fig. 17.16 Analog recording of the load-strain response of a vacuum hot-pressed beryllium specimen transverse to the pressing direction. Serrations (Portevin-Le Chatelier effect) can be seen along the lower-yield plateau. Source: Goldberg et al. 1982
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Published: 01 July 2009
Fig. 17.40 Fatigue crack growth rate versus K Ic for vacuum hot-pressed S-65 and S-200E. Source: Lemon and Brown 1985
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Published: 01 October 2012
Fig. 4.4 Schematic diagrams of two powder consolidation methods. (a) Vacuum hot pressing. In this method, a column of loose beryllium powders is compacted under vacuum by the pressure of opposed upper and lower punches (left). The billet is then brought to final density by simultaneous
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Published: 01 July 2009
Fig. 20.1 Schematic illustration of two beryllium consolidation processes. Hot isostatic pressing is shown by the two schematics on the left. Vacuum hot pressing is shown on the right. Source: Marder et al. 1990
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Published: 01 July 2009
Fig. 17.62 Effect of the average grain size on the ultimate tensile strength as a function of temperature of vacuum hot-pressed and hot-extruded (QMV) beryllium. Source: Beaver and Wikle 1954
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Series: ASM Technical Books
Publisher: ASM International
Published: 01 July 2009
DOI: 10.31399/asm.tb.bcp.t52230267
EISBN: 978-1-62708-298-3
... metallurgical techniques for beryllium were first developed in 1946. Currently, powder metallurgy is the main processing route to produce beryllium components. The vacuum hot pressing method results in a fine-grained, machinable form of the material. The random orientation and fine grain size of the powder...
Abstract
Powder metallurgy plays a central role in the production of nearly all beryllium components. This chapter describes the primary steps in the powder metal process and the work that has been done to improve each one. It explains how beryllium powders are made and how they are consolidated prior to sintering. It also compares and contrasts the properties of beryllium products made using different methods and provides composition and particle size data on commercially available powders.
Image
Published: 01 July 2009
Fig. 17.26 Plane-strain fracture toughness as a function of the ultimate tensile strength for vacuum hot pressed (VHP) S-65 and VHP S-200E. First and second letters refer to sample and crack orientation, respectively, relative to the VHP billet. L, longitudinal (parallel to the pressing
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Published: 01 July 2009
Fig. 20.22 Effect of extrusion-reduction ratio (12.4:1, 28:1, 38:1) on elongation as a function of temperature for vacuum hot pressed (QMV) beryllium hot extruded between 1050 and 1100 °C (1920 and 2010 °F). Source: Beaver and Wikle 1954
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Published: 01 July 2009
Fig. 20.21 Effect of extrusion-reduction ratio (12.4:1, 28:1, 38:1) on ultimate tensile strength as a function of temperature for vacuum hot pressed (QMV) beryllium hot extruded between 1050 and 1100 °C (1920 and 2010 °F). Source: Beaver and Wikle 1954
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Published: 01 July 2009
Fig. 20.24 Comparison of longitudinal and transverse elongations as a function of temperature for vacuum hot pressed (QMV) beryllium hot extruded at 1050 °C (1920 °F). Curves A (longitudinal) and B (transverse) are for comparable beryllium extrusions; the C (transverse) curve was obtained
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Published: 01 July 2009
Fig. 20.23 Comparison of longitudinal and transverse ultimate tensile strength as a function of temperature of vacuum hot pressed (QMV) beryllium hot extruded at 1050 °C (1920 °F). Curves A (longitudinal) and B (transverse) are for comparable beryllium extrusions; curve C (transverse
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Published: 01 July 2009
Fig. 4.16 Coefficient of thermal expansion (α) of beryllium versus temperature for vacuum hot pressed S-200F. Source: Haws 1988
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Published: 01 July 2009
Fig. 17.33 Calculated fracture toughness versus porosity for notched Charpy specimens of vacuum hot-pressed beryllium. Source: Pinto 1979b
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Published: 01 July 2009
Fig. 17.58 Influence of the presence and distribution of BeO particles on the recrystallization temperature of high-purity vacuum hot-pressed block. Source: Webster 1979
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Published: 01 July 2009
Fig. 17.61 Effect of grain size on the ultimate tensile strength as a function of temperature of vacuum hot-pressed (QMV) beryllium. Source: Beaver and Wikle 1954
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