Structure and mechanical properties of DP-type and TRIP-type sheets obtained after the thermomechanical processing

Adamczyk, J.; Grajcar, A.

doi:10.1016/j.jmatprotec.2005.02.032

Cited by 30 publications

(19 citation statements)

References 6 publications

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“…This transformation takes place during the cold forming of steel sheets and results in improving both strength and plasticity. This phenomenon is called the transformation-induced plasticity (TRIP) effect [10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Austenite Decomposition and Precipitation Behavior of Plastically Deformed Low-Si Microalloyed Steel

Grajcar

Morawiec

Zalecki

2018

Metals

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The aim of the present study is to assess the effects of hot deformation and cooling paths on the phase transformation kinetics in a precipitation-strengthened automotive 0.2C–1.5Mn–0.5Si steel with Nb and Ti microadditions. The analysis of the precipitation processes was performed while taking into account equilibrium calculations and phase transitions resulting from calculated time–temperature–transformation (TTT) and continuous cooling transformation (CCT) diagrams. The austenite decomposition was monitored based on thermodynamic calculations of the volume fraction evolution of individual phases as a function of temperature. The calculations were compared to real CCT and DCCT (deformation continuous cooling transformation) diagrams produced using dilatometric tests. The research included the identification of the microstructure of the nondeformed and thermomechanically processed supercooled austenite products formed at various cooling rates. The complex interactions between the precipitation process, hot deformation, and cooling schedules are linked.

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Section: Introductionmentioning

confidence: 99%

Austenite Decomposition and Precipitation Behavior of Plastically Deformed Low-Si Microalloyed Steel

Grajcar

Morawiec

Zalecki

2018

Metals

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“…Compared to the high-strength low-alloy (HSLA) steels, the DP steels exhibit a higher ultimate strength, higher work hardening rate, and elimination of yield point elongation with a considerable increase in ductility and formability. [1] In fact, the mechanical behavior of DP steels has been widely studied in the past years, [2][3][4] including the influence of the volume fraction (V m ) of the harder phase (martensite) on the yield and ultimate strengths. It was already established that during deformation the strain may be transferred into the martensite islands, after the ferrite matrix is excessively strained, and the shearing of the interface between the martensite and ferrite occurred in DP steels with a high value of V m .…”

Section: Introductionmentioning

confidence: 99%

Stress and Strain Partitioning of Ferrite and Martensite during Deformation

Cong

Jia

et al. 2009

Metall Mater Trans A

105

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The direct measurement of the stress or strain partitioning during deformation in the materials, consisting of two phases with the same crystallographic structure and different microstructures, is still difficult so far. This is due to the fact that no effective characterization tool is available with the ability to distinguish the local strain and stress at microscale level. In this article, we studied the micromechanical behavior of ferrite/martensite dual-phase (DP) alloys using the in-situ high-energy X-ray diffraction (HEXRD) technique. We established a new method to separate the stress and strain in the ferrite and martensite during loading. Although the ferrite and martensite exhibit the same crystal structure with similar lattice parameters, the dependence of (200) lattice strains on the applied stress is obviously different for each phase. A visco-plastic self-consistent (VPSC) model, which can simulate the micromechanical behavior of two-phase materials, was used to construct the respective constitutive laws for both phases from the experimental lattice strains and to fit the macro-stress-strain curve. The material parameters for each phase extracted from our experiments and simulations could be used for designing other DP alloys and optimizing some complex industrial processes.

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“…The Cu-P-CrNi-Mo weathering steel has many significant advantages and uses in the automobile industry mainly because of its high strength, low price, and good usability. [1][2][3] However, we determined via microstructure observation that the ferrite grain size of hot-rolled steel were large, which resulted in low ductility. [1] To our knowledge, the mechanical properties of dual-phase steel can be significantly improved when the microstructure mainly consists of a dispersion of uniform and fine hard martensite in the soft ferrite matrix.…”

Section: Introductionmentioning

confidence: 97%

Microstructure Evolution of a New Dual-Phase Steel via Multi-Pass Compression Deformation in the (α + γ) Region

Zhang

Kong

Zhang

et al. 2015

steel research int.

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Grain refinement provides an effective way to improve the strength of low-carbon steel without loss of room temperature ductility. The microstructure evolution of Cu-P-Cr-NiMo weathering steel during multi-pass deformation was investigated via hot compression simulation. The results indicated that ultrafine ferrite grains of 1.8 mm can be obtained in the (a þ g) region at multi-pass deformation conditions. The second phase of bainite and martensite was distributed as band form on the ferrite matrix and became thinner with increasing number of passes. The microstructural analysis results showed that at the initial pass deformation, strain-enhanced ferrite transformation is the main mechanism for structure refinement and at the later pass deformation, continuously dynamic recrystallization of ferrite is the main mechanism for ferrite grain refinement.

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Structure and mechanical properties of DP-type and TRIP-type sheets obtained after the thermomechanical processing

Cited by 30 publications

References 6 publications

Austenite Decomposition and Precipitation Behavior of Plastically Deformed Low-Si Microalloyed Steel

Austenite Decomposition and Precipitation Behavior of Plastically Deformed Low-Si Microalloyed Steel

Stress and Strain Partitioning of Ferrite and Martensite during Deformation

Microstructure Evolution of a New Dual-Phase Steel via Multi-Pass Compression Deformation in the (α + γ) Region

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