Abstract
The δ-TRIP steel has attracted a lot of attention for its potential application in automotive components, owing to the low density, good combination of strength, and ductility. As the difficulty in yield strength further increasement is caused by large fraction ferrite, the work hardening ability was enhanced by optimizing the manganese (Mn)-content in this study. Three δ-TRIP steels with different manganese (Mn)-content were designed to explore the significant effect of Mn content on the work hardening behavior in order to develop high strength steel suitable for the industrial continuous annealing process. The detailed effect of Mn on microstructure evolution and deformation behavior was studied by scanning electron microscope (SEM), interrupted tensile tests, X-ray diffraction (XRD), and in-situ electron backscattered diffraction (EBSD). The study suggested that 2 Mn steel has the lowest degree of bainitic transformation, as a result of fine grain size of prior austenite. The large TRIP effect and dislocation strengthening improve the work hardening rate, resulting in 2 Mn steel exhibiting comparable mechanical properties with the QP980 steels. The retained austenite in 1.5 Mn steel progressively transformed into martensite and sustained the strain to a high strain value of 0.40, showing a good strength-ductility balance.
Highlights
The requirement of low-cost production, environmental friendliness, and high safety performance in the automotive industry drives the development of lightweight vehicles.Besides weight reduction by the down-gauging of high strength steels, reducing the density of steels through the addition of aluminum (Al) has recently attracted significant attention [1,2,3,4]
A low-density δ-TRIP steel with good mechanical properties and weldability was developed for potential application in automotive components
The annealed microstructure, as ilin micrographs among the three quenched samples is the grain size prior austenite; lustrated in Figure 2a–c, are ferrite and prior austenite, which partly of transformed into the grain size finer in higher
Summary
The requirement of low-cost production, environmental friendliness, and high safety performance in the automotive industry drives the development of lightweight vehicles. Besides weight reduction by the down-gauging of high strength steels, reducing the density of steels through the addition of aluminum (Al) has recently attracted significant attention [1,2,3,4]. A low-density δ-TRIP steel with good mechanical properties and weldability was developed for potential application in automotive components. Δ-TRIP steel possesses good weldability because of stable δ-ferrite [9]. These excellent characteristics make it potentially attractive as a third-generation automotive steel. The large fraction of δ-ferrite in microstructure limits the further improvement of strength in δ-TRIP steels
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