INFLUENCE OF THE STRUCTURE SUCCESSION ON THE VOLUME FRACTION OF MARTENSITE AND FERRITE MICROHARDNESS IN A DUAL-PHASE STEEL WITH LOW MANGANESE CONTENT

2020 ◽  
Author(s):  
Constantin Dulucheanu ◽  
Traian Lucian Severin ◽  
Luminta Irimescu ◽  
Emanuel Berariu ◽  
Delia Aurora Cerlica
Keyword(s):  
Dual Phase Steel ◽  
Volume Fraction ◽  
Manganese Content ◽  
Dual Phase

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.

Microstructural and Tribological Characterization of API X52 Dual-Phase Steel

2021 ◽  
Author(s):  
Gamri Hamza ◽  
Allaoui Omar ◽  
Zidelmel Sami
Keyword(s):  
Mechanical Properties ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Wear Behavior ◽  
Normal Load ◽  
Great Influence ◽  
Dual Phase ◽  
Martensite Volume Fraction ◽  
Direct Quenching ◽  
Disc Configuration

Abstract The effect of the morphology and the martensite volume fraction on the microhardness, the tensile, the friction and the wear behavior of API X52 dual phase (DP) steel has been investigated. Three different heat treatments were used to develop dual phase steel with different morphologies and with different amounts of martensite: Intermediate Quenching Treatment/Water (IQ); Step Quenching Treatment (SQ) and direct quenching (DQ). Tribological tests are conducted on DP steels using a ball-on-disc configuration under normal load of 5 N and at a sliding speed of 4 cm/s were used to study the friction and wear behavior of treated samples. Results show that the ferrite–martensite morphology has a great influence on the mechanical properties of dual phase steel. The steel subjected to (IQ) treatment attain superior mechanical properties compared to the SQ and the DQ treatments. On the other hand, it is also found that the friction coefficient and the wear rate (volume loss) decrease when the hardness and the martensite volume fraction increase. The steel with fine fibrous martensite provide good wear resistance.

Micromechanical Simulation Approach of Dual Phase Steel Artificial Microstructure Using Random Field Model

2021 ◽  
Vol 1016 ◽  
pp. 534-540
Author(s):  
Mohamed Imad Eddine Heddar ◽  
Nadjoua Matougui ◽  
Brahim Mehdi
Keyword(s):  
Grain Size ◽  
Random Field ◽  
Dual Phase Steel ◽  
Field Model ◽  
Volume Fraction ◽  
Gaussian Kernel ◽  
Dual Phase ◽  
Strain Behavior ◽  
Proportional Relationship ◽  
Dp Steels

In this study, a random field (RF) model with a Gaussian kernel was applied to generate an artificial microstructure of dual phase (DP) steels. Micrographs obtained from Scanning Electron Microscopy (SEM) were analyzed using image processing software to extract the grain size and the volume fraction of each phase. Based on watershed (Ws) segmentation and quantitative analysis, the real and artificial microstructures were compared by analyzing grain features related the solidity, grain size and aspect ratio (the proportional relationship between its width and its height). Consequently, this approach allows to simulate the overall stress-strain behavior of the analyzed microstructures. As a result, it was shown that the strain localization starts to develop at the ferrite/martensite interface and that the RF model could replicate the micromechanical behavior of DP steels.

Strain-Hardening Model of Dual-Phase Steel With Geometrically Necessary Dislocations

2018 ◽  
Vol 140 (3) ◽  
Author(s):  
Chuang Ren ◽  
Wen Jiao Dan ◽  
Yong Sheng Xu ◽  
Wei Gang Zhang
Keyword(s):  
Strain Hardening ◽  
Dual Phase Steel ◽  
Volume Fraction ◽  
Lattice Mismatch ◽  
Cell Model ◽  
Interpolation Method ◽  
Nonlinear Function ◽  
Dual Phase ◽  
Hardening Model ◽  
Point Interpolation Method

The strain-hardening behavior of metal during the uniaxial tension can be treated as the competing result of generation and annihilation of statistically stored dislocations (SSDs). Geometrically necessary dislocations (GNDs) are generated to accommodate a lattice mismatch and maintain deformation compatibility in dual-phase (DP) steels because of the heterogeneous deformation of the microstructure. In this study, a dislocation-based strain-hardening model that encompasses GNDs was developed to describe the mechanical properties of dual-phase steel. The GNDs were obtained based on a cell model of uniaxial deformation and the SSDs were calculated using a dynamic recovery model. The strain of each phase is a nonlinear function of the overall material strain obtained by the point-interpolation method (PIM). The proposed strain-hardening model was verified by using commercially produced DP600 steel. The calculated results obtained with GNDs are able to predict more precisely the experimental data than that without. The effects of martensite volume fraction and grain size on the strain-hardening behaviors of individual phases and material were studied.

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.

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