Abstract
Annealed interstitial-free steel (IF steel) and deformed IF steel sheets were stacked alternatively into multi-layers to produce laminated IF steel through thermal-mechanical processing. After proper processing, a yield strength of 500MPa, an ultimate tensile strength of 600MPa (comparable to cold rolled one) and a uniform elongation around 17% can be realized. Microstructural observation by electron back-scatter diffraction revealed a characteristic hierarchical layer+heterogeneous lamella structure, namely L2 structure. The reasons for the good mechanical properties were discussed.
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