Dynamic shear response and evolution mechanisms of adiabatic shear band in an ultrafine-grained austenite–ferrite duplex steel

2010 ◽

Vol 667-669 ◽

pp. 761-765 ◽

Cited By ~ 1

Author(s):

Fu Ping Yuan ◽

Xiao Lei Wu

Keyword(s):

Grain Size ◽

Shear Band ◽

Adiabatic Shear Band ◽

Shear Loading ◽

Electron Back Scatter Diffraction ◽

Adiabatic Shear ◽

Dynamic Shear ◽

Micro Hardness ◽

Fine Grained ◽

Angular Pressing

Ultra-fine-grained (UFG)/Nanocrystalline (NC) materials usually show reduced strain hardening and limited ductility due to formation of adiabatic shear band (ASB) under dynamic loading. In the present study, evolution of ASB in UFG Fe under dynamic shear loading was investigated. The UFG Fe was processed by equal-channel angular pressing (ECAP) via route Bc. After 6 passes, the grain size of UFG Fe reaches ~ 600 nm, as confirmed by means of Electron Back Scatter Diffraction (EBSD). Examination of micro-hardness and grain size of UFG Fe as a function of post-ECAP annealing temperature shows a transition from recovery to recrystallization at 500 0C. The high-strain-rate response of UFG Fe was characterized by hat-shaped specimen set-ups in Hopkinson bar experiments. The characteristics of ASB as a function of shear displacement, such as thickness of shear band and micro-hardness inside the shear band, were examined by SEM and Vickers micro-indentation respectively.

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Annealing effect on the evolution of adiabatic shear band under dynamic shear loading in ultra-fine-grained iron

International Journal of Impact Engineering ◽

10.1016/j.ijimpeng.2012.07.001 ◽

2012 ◽

Vol 50 ◽

pp. 1-8 ◽

Cited By ~ 15

Author(s):

Fuping Yuan ◽

Ping Jiang ◽

Xiaolei Wu

Keyword(s):

Shear Band ◽

Adiabatic Shear Band ◽

Shear Loading ◽

Adiabatic Shear ◽

Annealing Effect ◽

Dynamic Shear ◽

Fine Grained

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Effect of temperature and strain rate on the shear properties of Ti–6Al–4V alloy

Proceedings of the Institution of Mechanical Engineers Part C Journal of Mechanical Engineering Science ◽

10.1243/09544062c05505 ◽

2006 ◽

Vol 220 (2) ◽

pp. 127-136 ◽

Cited By ~ 11

Author(s):

W-S Lee ◽

C-F Lin ◽

S-Z Huang

Keyword(s):

Shear Band ◽

Strain Rate ◽

Adiabatic Shear Band ◽

Rate Sensitivity ◽

Adiabatic Shear ◽

Effect Of Temperature ◽

Dynamic Shear ◽

Shear Properties ◽

Current Test ◽

Split Hopkinson

This study uses the torsional split-Hopkinson bar to investigate the dynamic shear deformation and fracture behaviour of Ti–6Al–4V alloy under strain rates of 1800, 2300, and 2800 s−1 at temperatures ranging from −100 to 300 °C. It is found that both the strain rate and the temperature have a strong influence on the dynamic shear properties and fracture characteristics of the alloy. An increased strain rate and a reduced temperature cause the strain rate sensitivity to increase and the activation volume to decrease. However, the activation energy increases with decreasing shear stress and is found to attain a maximum value of 15 kJ/ mol under the current test conditions. The failure of the tested alloy is dominated by the formation of an adiabatic shear band. The characteristics of the adiabatic shear band and the fracture surface depend significantly on both the strain rate and the temperature.

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