Effects of Heterogeneous Microstructures on the Strain Hardening Behaviors of Ferrite-Martensite Dual Phase Steel

Ren, Chunguang; Dan, W.J.; Xu, Yongsheng; Zhang, Weigang

doi:10.3390/met8100824

Cited by 9 publications

(3 citation statements)

References 51 publications

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“…This was due to the changes in strain strate on using different UHFPs. As the experiments were conducted in room temperature, strain hardening occurred due to agglomeration of dislocations, similar to the observations on dissimilar ferritic-martensitic joints by Ren et al [86]. This caused reduction in the ductility of joints.…”

Section: Evaluation Of Bend Fracturessupporting

confidence: 79%

Mechanical characteristics and stretch-bend failure analysis on ultra high frequency pulsed gas tungsten arc welded thin FSS 409/430 dissimilar joints

Nagarajan,

Marimuthu

2023

Mater. Res. Express

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The Mechanical and Stretch-Bend Failure studies on Ultra High Frequency Pulsed Gas Tungsten Arc Welded dissimilar joints of AISI409-AISI430 Ferritic Stainless Steels were conducted. Welding was conducted with 5 ultra high frequencies (50 Hz, 150 Hz, 250 Hz, 350 Hz, 450 Hz). Mechanical characteristics evaluation on the joints included tensile strength, microhardness variations across the welds and creep. Microstructural and metallurgical investigations included weld cross section evaluation, comparing grain variations in high, medium and low thermal heat affected zones, weld zones and base material region. Stretch bend failure studies included studies on angular distortion, fracture limit strain, and coefficient of friction. Tests revealed that joints welded at 350Hz was better, compared to other joints. Dissimilar AISI409-AISI430 joint fabricated at 350Hz exhibited 267 + 3 MPa as yield and 409 + 6 MPa and as ultimate tensile strength. Its creep fracture duration was 72.7 mins (highest among the joints). Microstructural studies revealed grain growth, partially coarse and partially fine grains in heat affected zones. Depending on the difference in grain sizes, on both sides of the welds, heat affected regions were identified as three distinct zones. In AISI430 side; high temperature austenitic, martensitic, delta ferrites and in AISI409 side; needle like martensitic structures, mixture of ferritic-austenitic, δ-ferrite with carbide precipitation were found in high, medium and low thermal heat affected zones, respectively. On increasing the ultra high frequency pulses, angular distortion increased, fractures changed from tensile/shear type to mixed type. In shear bend tests, on increasing the ratio of radius: thickness, fracture limit strain on outer surface, across sheet thickness, due to stretching increased.

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Section: Evaluation Of Bend Fracturessupporting

confidence: 79%

Mechanical characteristics and stretch-bend failure analysis on ultra high frequency pulsed gas tungsten arc welded thin FSS 409/430 dissimilar joints

Nagarajan,

Marimuthu

2023

Mater. Res. Express

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“…In recent years, much research has been conducted on the material mechanical properties at the ferrite-martensite interface, which can be considered as the phase affecting strength and ductility [17]. Kadkhodapour et al [18] investigated the relationship between the residual stresses and the yield behaviors of DP steels by considering their microstructure evolution.…”

Section: Introductionmentioning

confidence: 99%

Study on Microstructural Evolution of DP Steel Considering the Interface Layer Based on Multi Mechanism Strain Gradient Theory

et al. 2022

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A multi-mechanism constitutive model is proposed in this paper to better describe the effect of the local hardening behavior of the interface layer on the mechanical heterogeneity of dual-phase (DP) steel. The constitutive equations considering the geometrically necessary dislocations (GNDs) and back stress at grain level and sample level were established. Based on the finite element simulation results, the influences of local hardening and microstructure characteristics on the strain–stress evolution, statistical storage dislocations, GNDs, and back stress of DP steel were studied and discussed. Due to the local hardening effect, the ferrite phase was treated as an inhomogeneous matrix reinforced by some small islands of martensite in the simulation. The simulation results show that the thickness of the interface layer has a significant effect on the macroscopic hardening property of DP steel, while the number of interface layers has little effect. Meanwhile, the GNDs and back stress at the grain level also have little effect on the strengthening of DP steel. The contribution of GNDs at the sample level to the flow stress is about 47%.

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“…A micromechanical cell-based model for DP steels was developed by El-Abassy and Nemes, who used the single-phase parameter as unique input data for the model, obtaining results that show a good agreement between the experimental and numerical predictions, in terms of both stress-strain curve and strain hardening rate [24]. A micromechanical model based on the dislocation-based work-hardening model that considers multi-boundaries hardening was developed by Ren et al [25], finding that the theoretical predictions for tensile tests showed a good agreement with the experimental results. A micromechanical model that explains the influence of martensite fraction on the 0.2% proof stress was developed by Liedl and collaborators, carrying out three-dimensional finite element simulations and showing that there exists a work-hardened ferrite zone that has influence in the initial flow behavior of the steel [26].…”

Section: Introductionmentioning

confidence: 99%

Modeling the Mechanical Response of a Dual-Phase Steel Based on Individual-Phase Tensile Properties

Alvarez

Muñoz

Celentano

et al. 2020

Metals

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In this work, the engineering stress–strain tensile curve and the force-deflection bending curve of two Dual-Phase (DP) steels are modeled, combining the mechanical data of fully ferritic and fully martensitic steels. The data is coupled by a modified law of mixture, which includes a partition parameter q that takes into account the strength and strain distributions in both martensite and ferrite phases. The resulting constitutive model is solved in the context of the finite element method assuming a modified mixture rule in which a new parameter q′ is defined in order to extend the capabilities of the model to deal with triaxial stresses and strains and thus achieve a good agreement between experimental results and numerical predictions. The model results show that the martensite only deforms elastically, while the ferrite deforms both elastically and plastically. Furthermore, the partition factor q′ is found to strongly depend on the ferritic strain level. Finally, it is possible to conclude that the maximum strength of the studied DP steels is moderately influenced by the maximum strength of martensite.

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Effects of Heterogeneous Microstructures on the Strain Hardening Behaviors of Ferrite-Martensite Dual Phase Steel

Cited by 9 publications

References 51 publications

Mechanical characteristics and stretch-bend failure analysis on ultra high frequency pulsed gas tungsten arc welded thin FSS 409/430 dissimilar joints

Mechanical characteristics and stretch-bend failure analysis on ultra high frequency pulsed gas tungsten arc welded thin FSS 409/430 dissimilar joints

Study on Microstructural Evolution of DP Steel Considering the Interface Layer Based on Multi Mechanism Strain Gradient Theory

Modeling the Mechanical Response of a Dual-Phase Steel Based on Individual-Phase Tensile Properties

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