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1-20 of 2009
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Series: ASM Handbook
Volume: 22B
Publisher: ASM International
Published: 01 November 2010
DOI: 10.31399/asm.hb.v22b.a0005508
EISBN: 978-1-62708-197-9
... Abstract This article describes the most commonly used test methods for determining flow stress in metal-forming processes. The methods include tension, ring, uniform compression, plane-strain compression, torsion, split-Hopkinson bar, and indentation tests. The article discusses the effect...
Abstract
This article describes the most commonly used test methods for determining flow stress in metal-forming processes. The methods include tension, ring, uniform compression, plane-strain compression, torsion, split-Hopkinson bar, and indentation tests. The article discusses the effect of deformation heating on flow stress. It provides metallurgical considerations at hot working temperatures and presents flow curves at conventional metalworking strain rates. The article describes the effect of microstructural scale, crystallographic texture, and equiaxed phases on flow stress at hot working temperatures. It tabulates a summary of certain values describing the flow stress-strain rate relation for steels, aluminum alloys, copper alloys, titanium alloys, and other metals at various temperatures.
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Published: 01 January 2005
Fig. 2 Flow stress curves of typical magnesium forging alloys. (a) Stress strain curve of alloy ZK60. (b) Torsion flow stress (at strain rate of 5 s −1 ) of Alloy AZ31 at various homologous temperatures ( T / T M ). (c) Hot compression flow curves from extruded AZ31B compressed parallel
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Published: 01 January 2005
Fig. 28 Correlation of torsional flow stress data for a 0.25% C steel using a temperature-compensated strain-rate parameter (the Zener-Hollomon parameter, Z ). Source: Ref 89
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Published: 01 January 2005
Fig. 67 Effect of continuous heating or cooling on the steady-state flow stress of vacuum-melted iron. Deformed in torsion at an effective strain rate of 1.5 × 10 −3 s −1 . Source: Ref 128
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Published: 01 January 2005
Fig. 68 Effect of increasing or decreasing strain rate on the flow stress of copper deformed in torsion at 750 °C (1380 °F). Source: Ref 129
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Published: 01 January 2005
Fig. 3 Hypothetical dependence of (a) flow stress and (b) strain to failure on deformation temperature at three strain rates where ε ˙ 1 < ε ˙ 2 < ε ˙ 3
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Published: 01 January 2005
Fig. 4 Flow stress as a function of deformation temperature for an aluminum-magnesium alloy homogenized by different schedules (#1, #2, #3, #4)
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Published: 01 January 2005
Fig. 6 Flow stress for two versions of a 7xxx aluminum alloy as a function of strain rate at T def = 315 °C (600 °F)
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Published: 01 January 2005
Fig. 7 (a) Flow stress and (b) strain to failure as a function of homogenization time at 523 °C (975 °F). Deformation temperature is 493 °C (920 °F).
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Published: 01 January 2005
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Published: 01 January 2005
Fig. 9 (a) Equivalent tensile flow stress and (b) strain to failure of as-cast specimens deformed by hot torsion at various temperatures
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Published: 01 December 2004
Fig. 24 Flow-stress calculations for cold-rolled nickel (99.99%) based on microstructural measurements compared with Vickers hardness and literature data. Source: Ref 15
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Published: 01 January 2003
Fig. 13 Effect of grain size on LMIE. Variation of the flow stress of amalgamated zinc polycrystalline specimens, σ fZn , and fracture stress of amalgamated zinc specimens, σ FZn-Hg , as a function of grain size at 298 K
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Published: 31 December 2017
Fig. 6 Schematic diagram of the relative effects of deformation speed, flow stress, and lubrication on friction and die pressure in hot forging ( Ref 11 ). Die pressure increases with increasing flow stress of the deforming material with increasing strain rate. HERF, high energy rate forming
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Published: 01 December 1998
Fig. 12 Flow stress versus strain rate for alloy 6061 at three temperatures and a strain rate of 10 s −1
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Published: 01 December 1998
Fig. 13 Flow stress versus strain rate for alloys 2014 and 6061 at 370 °C (700 °F) and two different strain rates
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Published: 01 December 1998
Fig. 19 Effect of forging temperature on flow stress of titanium alloys at 10/s strain rate. (a) α-alloy Ti-8Al-1Mo-1V. (b) α-β alloy Ti-6Al-4V. (c) Metastable β-alloy Ti-10V-2Fe-3Al
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Published: 01 December 1998
Fig. 20 Effect of three strain rates (0.001, 0.1, and 10/s) on flow stress of three titanium alloys forged at different temperatures. (a) α-alloy Ti-8Al-1Mo-1V at 955 °C (1750 °F). (b) α-β alloy Ti-6Al-4V at 900 °C (1650 °F). (c) Metastable β-alloy Ti-10V-2Fe-3Al at 815 °C (1500 °F)
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Published: 15 June 2019
Fig. 6 Flow stress versus strain rate for alloy 6061 at three temperatures and a strain rate of 10 s −1
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Published: 15 June 2019
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