Abstract
The effects of different hot strip rolling process parameters on the phase transformation and the final properties of a microalloyed bainitic steel are investigated. Thermomechanical tests are conducted to analyze the influence on strength and toughness. Transmission electron microscopy, nanoindentation, and electron probe microanalysis are used to investigate the microstructural features and their impact on the mechanical properties. In particular, it is found that a thermomechanical treatment of the microalloyed steel leads to an increase in strength, strain hardening, and toughness. This is related to the microstructure influenced by the transformation, the carbon partitioning, and partly to strain‐induced precipitations. The pronounced strain hardening is achieved by finely dispersed martensite/austenite islands. In contrast, coarse martensite/austenite constituents reduce the toughness. Further, strain induced titanium precipitations contribute to the high yield strength.
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