scholarly journals Strain-path change induced transients in flow stress, work hardening and r-values in aluminum

2015 ◽  
Vol 69 ◽  
pp. 1-20 ◽  
Author(s):  
Tomáš Mánik ◽  
Bjørn Holmedal ◽  
Odd Sture Hopperstad
Keyword(s):  
Flow Stress ◽  
Work Hardening ◽  
Strain Path ◽  
Strain Path Change ◽  
Stress Work

Plastic Behaviour of Copper Polycrystal Subjected to Fatigue-Tension Sequential Loading Tests

2006 ◽  
Vol 514-516 ◽  
pp. 897-900
Author(s):  
Wei Ping Jia ◽  
José Valdemar Fernandes
Keyword(s):  
Yield Stress ◽  
Work Hardening ◽  
Strain Path ◽  
Mechanical Tests ◽  
Dislocation Slip ◽  
Tension Tests ◽  
Transmission Electron ◽  
Mean Grain Size ◽  
Work Hardening Rate ◽  
Strain Path Change

Sequences of fatigue-tension tests were performed on copper polycrystal sheet, with 32µm mean grain size. The effect of strain path change on subsequent reloading yield stress as well as work hardening rate has been investigated. Dislocation microstructure was observed by transmission electron microscopy after mechanical tests. Under present conditions, it was found that fatigue prestraining caused the increase of reloading yield stress, larger amplitude of strain path change resulted in higher reloading yield stress and lower work hardening rate. Reloading tensile curves are independent of predeformation plastic strain amplitudes in both cases. Many isolated dislocation lines between cell walls have been detected for Φ=0° case when the subsequent tension strain amount is 5%, this can be well understood from the microscopic dislocation slip mechanisms. When the reloading tension tests have been done until rupture, dislocation structures become typical of monotonic tension without preloading. The correlation of mechanical properties and microstructural observations was discussed in this paper.

scholarly journals Effect of Strain Path Change and Strain Aging on Anisotropic Work-Hardening Behavior in Ferritic Steel

2012 ◽  
Vol 98 ◽  
pp. 267-274 ◽  
Author(s):  
Kensuke Nagai ◽  
Yasuhiro Shinohara ◽  
Eiji Tsuru ◽  
Mayuko Ishino ◽  
Tetsuya Suzuki
Keyword(s):  
Work Hardening ◽  
Strain Path ◽  
Ferritic Steel ◽  
Strain Aging ◽  
Work Hardening Behavior ◽  
Hardening Behavior ◽  
Strain Path Change

Calibration of a strain path change model for a dual phase steel

2021 ◽  
Vol 194 ◽  
pp. 106217
Author(s):  
Diane Hérault ◽  
Sandrine Thuillier ◽  
Shin-Yeong Lee ◽  
Pierre-Yves Manach ◽  
Frédéric Barlat
Keyword(s):  
Strain Path ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Change Model ◽  
Strain Path Change

Effect of Pre-Strain and Roller Working on Torsional Fatigue Properties of a Structural Steel

2011 ◽  
Vol 295-297 ◽  
pp. 2227-2230
Author(s):  
Cong Ling Zhou
Keyword(s):  
Residual Stress ◽  
Fatigue Limit ◽  
Work Hardening ◽  
Compressive Residual Stress ◽  
Strain Ratio ◽  
Fatigue Tests ◽  
The Other ◽  
Fatigue Properties ◽  
Torsional Fatigue ◽  
Stress Work

In this study, fatigue tests have been performed using two kinds of specimens made of 25 steel. One is pre-strained specimen with pre-strain ratio changing from 2% to 8% by tension, the other is roller worked with deformation of 0.5 mm and 1.0 mm in diameter direction. In the case of pre-strained specimen, the fatigue limit increases according to increase of tensile pre-strain, the fatigue limit of 8% pre-strained specimen is 25% higher than that of non-pre-strained one; in the case of roller worked specimen, the fatigue limit of R05 and R10 is 126% and 143% to that of non-roller worked specimen, respectively. These remarkable improvements of fatigue limit would be caused by the existence of compressive residual stress, work-hardening and the elongated microscopic structures.

Microtexture Development and Flow Stress Saturation during Triaxial Forging of an Al-3Mg-Sc(Zr) Alloy

2007 ◽  
Vol 546-549 ◽  
pp. 793-800
Author(s):  
S. Ringeval ◽  
David Piot ◽  
Julian H. Driver
Keyword(s):  
Flow Stress ◽  
Work Hardening ◽  
Room Temperature ◽  
Specific Work ◽  
Textural Evolution ◽  
Spatially Resolved ◽  
Grain Fragmentation ◽  
New Type ◽  
Grain Coalescence ◽  
Zr Alloy

An Al-3%Mg-0.25%Sc-0.12%Zr alloy was deformed by triaxial forging at 20-400°C up to strains of about 3. A study of its textural evolution reveals the tendency towards three symmetrical variants of a <110><1 10 ><001> component. This experimental observation is supported by a 3D spatially resolved crystal plasticity analysis. Samples strained at room temperature undergo grain fragmentation in the form of fine substructures and relatively weak textures. Conversely, at 300°C and above, more homogeneous intergranular deformation and rotations give rise to stronger textures. This eventually encourages grain coalescence and thus the development of interpenetrating “orientation chains”, creating a new type of microstructure. The influence of this texture development on the specific work hardening behaviour is discussed.

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