Deformation Behaviour of Martensite in a Low-Carbon Dual-Phase Steel

2006 ◽  
Vol 15-17 ◽  
pp. 774-779 ◽  
Author(s):  
M. Mazinani ◽  
Warren J. Poole
Keyword(s):  
Dual Phase Steel ◽  
Volume Fraction ◽  
Deformation Behaviour ◽  
Dual Phase ◽  
Low Carbon ◽  
Heating Rates ◽  
Dp Steel ◽  
Martensite Content ◽  
High Heating ◽  
Different Temperatures

The deformation behaviour of martensite and its effect on tensile properties of a lowcarbon dual-phase (DP) steel were investigated. DP steel samples with different martensite contents and morphologies were produced after intercritical annealing at different temperatures using low and high heating rates. Two distinct martensite morphologies were obtained for low and high heating rates. The investigated steel showed the unusual results that the true fracture stress and strain were found to increase with the martensite volume fraction. The plastic deformation of martensite was considered to be responsible for these results. Experimentally, it was observed that the martensite in DP steels with greater than 25-30% martensite can deform plastically during tensile straining. Finally, the effect of tempering on the martensite plasticity was also evaluated. It was found that the tempering process and an increase in the martensite content have a similar effect on promoting martensite plasticity.

Study of Recrystallization and Phase Transformation in a Cold-Rolled Dual-Phase Steel: Influence of Temperature and Heating Rate during First Annealing Stages

2011 ◽  
Vol 702-703 ◽  
pp. 818-821 ◽  
Author(s):  
Carla Barbatti ◽  
Patricia Romano Triguero ◽  
Stefan Van Bohemen ◽  
Steven Celotto ◽  
Dave N. Hanlon
Keyword(s):  
Heating Rate ◽  
Dual Phase Steel ◽  
Dual Phase ◽  
Low Carbon ◽  
Dp Steel ◽  
Influence Of Temperature ◽  
Individual Contributions ◽  
Cold Rolled ◽  
Dp Steels ◽  
The Individual

The effect of heating path and heating rate on the microstructure and texture development in cold-rolled continuously annealed DP steel was studied by SEM and EBSD. A methodology to separate the individual phases present in mixed microstructures, and thus to enable quantification of the individual contributions to the bulk texture has been applied. It was observed that a higher heating rate may promote strengthening of {111} textures in DP steels as observed in low carbon grades.

Microstructure and Property Control of Hot Rolled DP600 Steel

2011 ◽  
Vol 415-417 ◽  
pp. 938-942
Author(s):  
Le Yu Zhou ◽  
Ya Zheng Liu ◽  
Lian Hong Yang ◽  
Dan Zhang
Keyword(s):  
Dual Phase Steel ◽  
Volume Fraction ◽  
Ferrite Matrix ◽  
Accelerated Cooling ◽  
Dual Phase ◽  
Dp Steel ◽  
Fine Grain ◽  
Mechanical Experiment ◽  
Property Control ◽  
Hot Rolled

Thermal mechanical experiment of step-cooling of 600MPa hot-rolled DP steel after compressed was carried out on Gleeble-1500 thermal mechanical simulator, using design of butterfly-shaped sample. Microstructure evolution during step-cooling and its effect on mechanical property of tested steel were analyzed. It is shown that, dual phase microstructure which martensite islands disperses in fine grain ferrite matrix is obtained by holding for 8~10s at 670°C followed accelerated cooling to 200°C. With increasing of holding time, grain size of ferrite coarsens, and volume fraction of ferrite has few changes. Meanwhile, tensile strengths of tested steel are all near 600MPa. That is to say, ferrite transformation is adequate during holding for 8~10s at 670°C and tensile strength of dual phase steel is stable accordingly.

The Influence of Quenching Temperature on the Structure of a Dual-Phase Steel with 0.094% C and 0.53% Mn

2015 ◽  
Vol 809-810 ◽  
pp. 507-512 ◽  
Author(s):  
Constantin Dulucheanu ◽  
Nicolai Bancescu ◽  
Traian Severin
Keyword(s):  
Carbon Content ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Manganese Content ◽  
Heat Treatments ◽  
Metallographic Analysis ◽  
Dual Phase ◽  
Low Carbon ◽  
Dual Phase Steels ◽  
Quenching Temperature

In this article, the authors have analysed the influence of quenching temperature (TQ) on the microstructure of a dual-phase steel with a low carbon and manganese content (0,094 % C and 0,53 % Mn). The ferrite-martensite structures, typical of the dual-phase steels, has been obtained by intercritical quenching that consisted of heating at temperatures (TQ) ranging between 750 °C and 830 °C, maintaining for 30 minutes and cooling in water. After carrying out intercritical heat treatments, samples have been subjected to metallographic analysis through which the volume fraction of martensite (VM), the volume fraction of ferrite (VF), the carbon content of the martensite (CM), the morphology and distribution of these phases have been determined, and then, the influence of quenching temperature (TQ) has been established.

Effect of Continuous Annealing Parameters on the Microstructure and Magnetic Property of Cold Rolled Dual Phase Steel

2012 ◽  
Vol 476-478 ◽  
pp. 241-247 ◽  
Author(s):  
Li Gao ◽  
Qiu Hong Song ◽  
Jun Ting Yuan
Keyword(s):  
Magnetic Properties ◽  
Magnetic Property ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Annealing Process ◽  
Continuous Annealing ◽  
Dual Phase ◽  
Quenching Temperature ◽  
Dp Steel ◽  
Cold Rolled

The effect of continuous annealing parameters on the microstructure and magnetic property of cold rolled dual phase steel (DP steel) are investigated. Correlations of microstructure, magnetic properties and continuous annealing parameters are revealed. The mechanism of the magnetic property varying with continuous annealing process is also discussed. The results show that recrystallization is almost completed when heating to 740°C. For the DP steel soaked in the range of 770°C-830°C and quenched in different temperature, the TEM results indicate its microstructure mainly consists of the ferrite and martensite phase. The martensite volume fraction increases gradually with increasing the soaking and quenching temperature. It is found that magnetic properties of dual phase steel are very sensitive to continuous annealing process. With rising soaking and quenching temperature, the coercivity and hysteresis loss increase obviously, whereas the maximum permeability and the remanent induction tend to decrease.

scholarly journals Effect of the intermediate quenching on fracture toughness of ferrite-martensite dual phase steels

2020 ◽  
Vol 15 (55) ◽  
Author(s):  
B Sunil ◽  
S. Rajanna
Keyword(s):  
Fracture Toughness ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Research Work ◽  
Testing Procedure ◽  
Optical Microscope ◽  
Martensite Phase ◽  
Dual Phase ◽  
Low Carbon ◽  
Dual Phase Steels

The main aim of the research work is to examine the fracture toughness of the dual phase steels prepared using the intermediate quenching method. The ferrite-martensite dual phase (DP) steel is produced using low carbon micro alloyed steel by the heat treatment and intercritical quenching technique using various intercritical temperatures such as 740,760,780,800 and 820oC. The samples of the produced dual phase steel are analyzed for their microstructure using optical microscope. The fracture toughness investigations for the dual phase steel have been carried out using ASTM standard testing procedure. From the results it is observed that the fine distribution and equal volume fraction of ferrite and martensite phases at 780oC. The effect of which, the A780 steel has demonstrated excellent fracture toughness which is the result of intermediate quenching technique. The fractography analysis it is clear that the ductile initiated brittle fracture is occurred which is due to the increased hard martensite phase and the increment in the stress accumulation at the ferrite which also leads to the higher elongation.

The Effects of Heating Rate and Cold Work on the Development of Dual-Phase Steel Microstructures

2014 ◽  
Vol 922 ◽  
pp. 755-760
Author(s):  
L.S. Thomas ◽  
David K. Matlock ◽  
John G. Speer
Keyword(s):  
Heating Rate ◽  
Dual Phase Steel ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
Carbon Steels ◽  
Dual Phase ◽  
Low Carbon ◽  
Heating Rates ◽  
Contributing Factors ◽  
Transformation Temperatures

The effects of heating rate and prior cold work on the development of dual-phase steel microstructures in three low carbon steels were evaluated with samples processed on a Gleeble 3500 thermomechanical processing simulator. The nominally 0.2 wt pct carbon steels included a plain carbon steel and modified alloys incorporating higher manganese contents, boron additions, and microalloy additions. Each alloy was prepared with two different cold rolled reductions. Heating rates from 1 to 1000 oC/s were selected to span the rates typically experienced in conventional furnace heat treating up to rates for induction heating. Critical transformation temperatures were obtained from dilatometric curves. Dual-Phase microstructures after heat treatment with different heating rates were compared. Transformation temperatures decreased with an increase in cold work and increased with an increase in heating rate. The steels with higher manganese and carbon additions exhibited lower Ac3 values across all heating rates and the steels with higher silicon higher Ac1 temperatures across all heating rates. Ac1 increased less than Ac3 with increasing heating rate. The increase in transformation temperatures between 100 and 1000 °C/s was smaller than values exhibited over other increments in heating rate, and decreased in one steel; contributing factors were identified for this behavior.

The Assessment of Work Hardening Behaviour of Dual Phase Steels with Coarse Martensite Islands

2012 ◽  
Vol 476-478 ◽  
pp. 311-315
Author(s):  
Azam Rasouli ◽  
Mohammad Mazinani
Keyword(s):  
Tensile Properties ◽  
Work Hardening ◽  
Intercritical Annealing ◽  
Deformation Behaviour ◽  
Annealing Treatment ◽  
Tensile Loading ◽  
Dual Phase ◽  
Dp Steel ◽  
Martensite Content ◽  
Dp Steels

In this paper, the tensile properties of dual phase (DP) steels with different martensite contents have been studied. Two steels with 0.09 and 0.15% carbon were used for the production of DP steel samples via intercritical annealing treatment, and the deformation behaviour of DP steel samples were examined during tensile loading. Although DP steels usually show two-stage work hardening behaviour, DP steels in this study with relatively high martensite content and coarse islands size exhibit a three-stage work hardening behaviour. This unusual behaviour was attributed, with the help of SEM micrographs, to decohesion of martensite-ferrite interface and martensite cracking.

Sign in / Sign up

Export Citation Format

Share Document