Crystal plasticity modeling of 3rd generation multi-phase AHSS with martensitic transformation

Park, Taejoon; Hector, Louis G.; Hu, Xiaohua; Abu-Farha, Fadi; Fellinger, Michael R.; Kim, Hyunki; Esmaeilpour, Rasoul; Pourboghrat, Farhang

doi:10.1016/j.ijplas.2019.03.010

Cited by 81 publications

(31 citation statements)

References 91 publications

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“…[121] Because the TRIP-effect profoundly influences flow behavior in these steels, developing reasonable empirical models for DIMT that incorporate strain state, strain rate, and temperature rise during non-isothermal deformation will be crucial for informing microstructure design. [40,[122][123][124] Currently, modeling the role of the TRIP-effect on plasticity and fracture is of significant interest for optimizing microstructure design and predicting forming limits and crash performance. [122][123][124] However, these models have not yet incorporated the strain rate sensitivity of DIMT.…”

Section: Recommendations For Future Researchmentioning

confidence: 99%

Strain Rate Dependent Ductility and Strain Hardening in Q&P Steels

Finfrock

Thrun

Bhattacharya

et al. 2021

Metall Mater Trans A

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Due to their high strength, formability and affordable cost, quenched and partitioned (Q&P) steels have shown the potential to reduce the mass of vehicles, thereby decreasing fuel consumption during service. Furthermore, because a lower mass of steel is used in each vehicle, energy consumption associated with the steelmaking process is also reduced. Q&P steels utilize the deformation-induced martensitic transformation (DIMT) of metastable retained austenite to enhance ductility and strain hardening. Accordingly, improvement of mechanical performance is contingent on the ability to precisely control the chemical and mechanical stability of austenite. Considering the multitude of factors that influence austenite stability, optimizing microstructures to delay necking or fracture is challenging, particularly as temperature and strain rate increase. Tensile tests of an intercritically annealed C-Mn-Si Q&P steel were performed over a range of strain rates (10 À4 to 10 À1 s À1 ) to evaluate effects on the DIMT and sheet tensile properties. As strain rates increased from 10 À4 to 10 À1 s À1 , the uniform elongation decreased from approximately 19 to 14 pct. This reduction in uniform elongation is associated with a decrease in the strain hardening exponent near the onset of strain localization. Based on experimental data from this study and review of previous research, it is postulated that the strengthening contribution of DIMT is controlled by competing effects of: (i) a decreasing chemical driving force for DIMT caused by deformation-induced heat accumulation at higher strain rates and (ii) an increasing number of martensite nucleation sites. This suggests that tailoring austenite stability for specific deformation conditions could enable further optimization of formability and vehicle crash behavior.

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Section: Recommendations For Future Researchmentioning

confidence: 99%

Strain Rate Dependent Ductility and Strain Hardening in Q&P Steels

Finfrock

Thrun

Bhattacharya

et al. 2021

Metall Mater Trans A

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“…In this work, mechanical properties of BAO Q&P 980 steel and niobium sheets at room temperature were characterized for the developed evolutionary model. Further details on the heat treatment of the Q&P 980 (Fe-0.2C-1.8Mn-1.5Si) steel and the chemical composition of the high purity superconducting niobium sheet can be found in the former publications [26,30,31]. Overall, the Q&P 980 steel shows mild anisotropy, while the niobium sheet exhibits highly anisotropic behavior.…”

Section: Methodsmentioning

confidence: 99%

An Evolutionary Yield Function Model Based on Plastic Work and Non-Associated Flow Rule

Park¹,

Abu-Farha

Pourboghrat³

2019

Metals

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A constitutive law was developed based on the evolutionary yield function to account for the evolution of anisotropy induced by the plastic deformation. For the effective description of anisotropy, the yield stress function and plastic potential were separately defined based on the non-associated flow rule. In particular, for the description of the equivalent status, the accumulated plastic work was employed as an alternative to the accumulated plastic strain. Numerical formulations based on the plastic work were also derived in case the hardening rule, as well as the evolution of the plastic potential and yield stress function, were defined in terms of the plastic work. The developed constitutive law was characterized using the mechanical properties of the multi-phase BAO QP980 steel and niobium sheets at room temperature. From the uniaxial tension tests and the balanced biaxial tension test, separate sets of anisotropic coefficients for each of the plastic potential and yield stress functions were obtained as a function of the plastic work. By comparing with non-evolving yield functions, the importance of the developed constitutive law to properly describe the evolution of the plastic potential and yield function were validated.

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“…Our method is therefore expected to provide insights into the evolutions of spatially-resolved microstructural data, such as the distribution of phases and crystal orientations, that would be valuable, for example, for the investigation of deformation-induced phase transformations in TRIP steel [16,70]. Such datasets would also help calibrate crystal plasticity models through direct comparisons with full-field simulations [71]. The interrupted nature of the test is considered a limited drawback in most experiments where plastic deformation mechanisms are of interest: the analytical techniques considered here are timeconsuming so even true in situ deformation experiments must be interrupted to perform the…”

Section: Author Accepted Manuscriptmentioning

confidence: 99%

Tracking Microstructure Evolution in Complex Biaxial Strain Paths: A Bulge Test Methodology for the Scanning Electron Microscope

Plancher

Vonk

et al. 2019

Exp Mech

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In this work, a novel method is presented to track site-specific microstructure evolution in metallic materials deformed biaxially along proportional and complex strain paths. A miniaturized bulge test setup featuring a removable sample holder was designed to enable incremental measurements to be performed in a scanning electron microscope, by probing the same position on the sample at different deformation levels, with electron backscatter diffraction (EBSD), electron channeling contrast imaging (ECCI) and other imaging modes.Validation experiments were performed at room temperature on samples prepared from commercial sheet metal (dual-phase steel) and foils (stainless steel). Local strain measurements with the digital image correlation technique confirmed that proportional strain paths with a strain ratio up to 5 can be investigated using elliptical dies in the bulge test holder. It is also shown how complex strain paths can be obtained using a combination of overlapping elliptical dies. Incremental EBSD and ECCI were conducted in configurations relevant for the multi-scale investigation of localized plasticity and damage mechanisms in dual-phase steel. Quantitative information regarding microstructure evolution (phase fractions, orientation fields, dislocation structures, etc.) and regarding local strain distributions could be successfully obtained. This type of data sheds light on underlying deformation mechanisms and provides opportunities to calibrate crystal plasticity models.

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Crystal plasticity modeling of 3rd generation multi-phase AHSS with martensitic transformation

Cited by 81 publications

References 91 publications

Strain Rate Dependent Ductility and Strain Hardening in Q&P Steels

Strain Rate Dependent Ductility and Strain Hardening in Q&P Steels

An Evolutionary Yield Function Model Based on Plastic Work and Non-Associated Flow Rule

Tracking Microstructure Evolution in Complex Biaxial Strain Paths: A Bulge Test Methodology for the Scanning Electron Microscope

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