Deformation of annealed low carbon steel at high strain-rates

1972 ◽  
Vol 20 (4) ◽  
pp. 251-254 ◽  
Author(s):  
R.S. Lee ◽  
N.P. Suh
Keyword(s):  
Carbon Steel ◽  
High Strain ◽  
Low Carbon Steel ◽  
Strain Rates ◽  
Low Carbon ◽  
High Strain Rates

The Effect of Severe Plastic Deformation on the Brittle-Ductile Transition in Low Carbon Steel

2009 ◽  
Vol 633-634 ◽  
pp. 471-480
Author(s):  
Masaki Tanaka ◽  
Kenji Higashida ◽  
Tomotsugu Shimokawa
Keyword(s):  
Fracture Toughness ◽  
Carbon Steel ◽  
Grain Boundaries ◽  
Three Dimensional ◽  
Low Carbon Steel ◽  
Dislocation Dynamics ◽  
Strain Rates ◽  
Low Carbon ◽  
Dislocation Source ◽  
Brittle Ductile Transition

Brittle-ductile transition (BDT) behaviour was investigated in low carbon steel deformed by an accumulative roll-bonding (ARB) process. The temperature dependence of its fracture toughness was measured by conducting four-point bending tests at various temperatures and strain rates. The fracture toughness increased while the BDT temperature decreased in the specimens deformed by the ARB process. Arrhenius plots between the BDT temperatures and the strain rates indicated that the activation energy for the controlling process of the BDT was not changed by the deformation with the ARB process. It was deduced that the decrease in the BDT temperature by grain refining was not due to the increase in the dislocation mobility controlled by short-range barriers. Quasi-three-dimensional simulations of dislocation dynamics, taking into account of crack tip shielding due to dislocations, were performed to investigate the effect of a dislocation source spacing along a crack front on the BDT. The simulation indicated that the BDT temperature is decreased with decreasing in the dislocation source spacing. Molecular dynamics simulations revealed that moving dislocations were impinged against grain boundaries and were reemitted from there with increasing strain. It indicates that grain boundaries can be new sources in ultra-fine grained materials, which increases toughness at low temperatures.

scholarly journals Plastic flow and anisotropy of a low-carbon steel over a range of strain-rates

2018 ◽  
Vol 121 ◽  
pp. 157-171 ◽  
Author(s):  
Yannis P. Korkolis ◽  
Benjamin R. Mitchell ◽  
Michael R. Locke ◽  
Brad L. Kinsey
Keyword(s):  
Carbon Steel ◽  
Plastic Flow ◽  
Low Carbon Steel ◽  
Strain Rates ◽  
Low Carbon

scholarly journals Deformation Behavior of Low Carbon TRIP Sheet Steels at High Strain Rates.

2002 ◽  
Vol 42 (12) ◽  
pp. 1483-1489 ◽  
Author(s):  
I. D. Choi ◽  
D. M. Bruce ◽  
S. J. Kim ◽  
C. G. Lee ◽  
S. H. Park ◽  
...  
Keyword(s):  
Deformation Behavior ◽  
High Strain ◽  
Strain Rates ◽  
Low Carbon ◽  
High Strain Rates ◽  
Sheet Steels

scholarly journals Static and dynamic response of ultra-fast annealed advanced high strength steels

2018 ◽  
Vol 183 ◽  
pp. 03017
Author(s):  
Florian Vercruysse ◽  
Felipe M. Castro Cerda ◽  
Roumen Petrov ◽  
Patricia Verleysen
Keyword(s):  
Strain Rate ◽  
Retained Austenite ◽  
High Strain ◽  
High Strength Steels ◽  
High Strength ◽  
Strain Rates ◽  
Low Carbon ◽  
Heating Rates ◽  
High Strain Rates ◽  
Advanced High Strength Steels

Ultra-fast annealing (UFA) is a viable alternative for processing of 3rd generation advanced high strength steels (AHSS). Use of heating rates up to 1000°C/s shows a significant grain refinement effect in low carbon steel (0.1 wt.%), and creates multiphase structures containing ferrite, martensite, bainite and retained austenite. This mixture of structural constituents is attributed to carbon gradients in the steel due to limited diffusional time during UFA treatment. Quasi-static (strain rate of 0.0033s-1) and dynamic (stain rate 600s-1) tensile tests showed that tensile strength of both conventional and UFA sample increases at high strain rates, whereas the elongation at fracture decreases. The ultrafast heated samples are less sensitive to deterioration of elongation at high strain rates then the conventionally heat treated ones. Based on metallographic studies was concluded that the presence of up to 5% of retained austenite together with a lower carbon martensite/bainite fraction are the main reason for the improved tensile properties. An extended stability of retained austenite towards higher strain values was observed in the high strain rate tests which is attributed to adiabatic heating. The extension of the transformation induced plasticity (TRIP) effect towards higher strain values allowed the UFA-samples to better preserve their deformation capacity resulting in expected better crashworthiness.

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