Showing papers on "TRIP steel published in 1996"
TL;DR: In this paper, a review of traditional strengthening concepts and more recently developed concepts (e.g., bake hardening and strengthening of interstitial-free steels) are reviewed. And the future in steel development will be determined by the physical modeling of properties and by adapting new process routes such as thin slab casting and in-line rolling.
Abstract: Several groups of cold-rolled, high-strength sheet steels have been developed to optimize the required strength and formability levels for automotive applications. Multiphase steels offer new opportunities where high-strength levels are demanded. The future in steel development will be determined by the physical modeling of properties and by adapting new process routes such as thin slab casting and in-line rolling. In this article, developments in traditional strengthening concepts (e.g., microalloying and substitutional hardening with phosphorus) and more recently developed concepts (e.g., bake hardening and strengthening of interstitial-free steels) are reviewed.
77 citations
TL;DR: In this paper, the authors investigated the transformation behavior and compositional partitioning in TRIP (Transformation Induced Plasticity) steel by means of microstructural observation and computer modeling.
Abstract: Transformation behavior and compositional partitioning in TRIP (Transformation Induced Plasticity) steel was investigated by means of microstructural observation and computer modeling. Studies were made on each of three stages of the continuous annealing process applied to TRIP steel. Ortho-equilibrium partitioning of alloying elements of Si and Mn was attained even in short intercritical annealing time. A transformation model, in which transformation is controlled by carbon diffusion, well described the volume fractional change of ferrite and pearlite during the cooling to austempering temperature. Slower cooling rates significantly increased carbon concentration enriched in untransformed austenite and caused pearlite transformation. Ultimate bainite volume fraction obtained by austempering increased with austempering temperature. Analysis with computer modeling revealed that transformation kinetics above 350°C followed a model based on the diffusional mechanism, while it complied with a model based on the displacive mechanism below 350°C.
31 citations
Metz1
TL;DR: In this article, a micromechanical model of the phase transformation of TRIP steel is proposed based on a kinematic description at a microscopic level that allows us to propose a model for phase transformation.
Abstract: For TRIP steel the determination of the global behavior during phase transformation is complicated since the response of the material to an external thermomechanical loading is not only due to a large scale orientation of the transformation strain of martensite [1] (Bain Strain) but also to a large scale orientation of plastic flow in austenite [2] and martensite due to irreversible strains at the microscopic scale. The aim of this paper is to give an analysis of this point based on a kinematic description at a microscopic level that allows us to propose a micromechanical model of the phenomenon.
1 citations
1 citations