High Strain Rate Tensile Behavior of 1180MPa Grade Advanced High Strength Steels

2020 ◽  
Author(s):  
Vesna Savic ◽  
Louis Hector ◽  
Rakan Alturk ◽  
Charles Enloe
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
High Strength Steels ◽  
High Strength ◽  
Tensile Behavior ◽  
Advanced High Strength Steels

Warm-Forging Characteristics and Microstructural Response of Medium-Carbon High-Strength Steels for High-Duty Components

2014 ◽  
Vol 611-612 ◽  
pp. 167-172 ◽  
Author(s):  
Piotr Skubisz ◽  
Łukasz Lisiecki
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
Microstructure Evolution ◽  
High Strain ◽  
Deformation Behaviour ◽  
Metal Flow ◽  
High Strength Steels ◽  
High Strength ◽  
Medium Carbon ◽  
Warm Forging

Paper presents deformation behaviour and microstructural response of selected medium-carbon high-strength steels commonly used for high-duty components deformed under high-strain-rate and warm work temperature range. The investigation of material behaviour is oriented at analysis of hot and warm workability of material and microstructure evolution resultant from deformation mechanisms, strain induced recrystallization and hardening at temperatures of lower forging regime and high strain rate deformation. The effect of these factors on microstructure after forging and subsequent direct-cooling was studied. Metallographic work aided with numerical methods of simulation of the metal flow and microstructure evolution during forging were used to correlate thermo-mechanical parameters observed with microstructure and mechanical properties after forging and cooling.

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.

scholarly journals Modern high strength steels under high strain-rate regimes

2021 ◽  
Vol 250 ◽  
pp. 05013
Author(s):  
Ezio Cadoni ◽  
Matteo Dotta ◽  
Daniele Forni
Keyword(s):  
High Strain Rate ◽  
Strain Rate ◽  
High Strain ◽  
Single Layer ◽  
High Strength Steels ◽  
High Strength ◽  
Critical Infrastructures ◽  
Mechanical Resistance ◽  
Large Specimen ◽  
High Rise

In order to properly design critical infrastructures and buildings in steel (bridges, high-rise building, off-shore, cranes, etc.), certain requirements concerning to mechanical resistance and robustness under exceptional actions have to be carefully fulfilled. An acceptable level of safety must be assured to avoid human loss, environmental pollution and material damage. These structures can be subjected to severe accidental loading such as blast or impact. In this context it is fundamental to adequately know the behaviour of structural steel under high strain rate. Modern high strength steels are quenched and selftempered steels. These steels have several layers with differentiated microstructures (martensitic in the cortical part and ferritic in the core). The behaviour of the single layer at high strain rate regimes have to be accurately studied. The paper collects and discusses the tensile results at high strain rate obtained on samples of homogeneous layers of S690QL and S960QL steels. Finally, the characterisation of the single layers has been used in order to analyse the results obtained in large specimen obtained from slabs 12mm thick.

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