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Strengthening of ferritic steels are usually realized by fine precipitation for industrial application. When alloy carbides are precipitated from ferrite, larger amount of precipitation strengthening can be obtained by decreasing the inter-particle spacing, i.e. with higher number density and smaller size under the same volume fraction.1) In particular, nano-sized alloy carbides formed through interphase precipitation were found to have great potential in strengthening ferritic matrix (~ 300 MPa) accompanied by reasonable contribution in ductility and thus formability.2–5) When steels are microalloyed with strong carbide-forming element, e.g. niobium (Nb), titanium (Ti) or vanadium (V), different from general precipitation by aging of supersaturated matrix, interphase precipitation occurs as the phenomenon that alloy carbides are precipitated in sheets by periodic nucleation at migrating ferrite/austenite (α/γ ) interface during transformation.6) When α/γ interface moves forward, newly formed alloy carbides will be left in α and thus strengthen α matrix. As a result, steels with high strength can be produced through direct cooling without any further Randomization of Ferrite/austenite Orientation Relationship and Resultant Hardness Increment by Nitrogen Addition in Vanadium-microalloyed Low Carbon Steels Strengthened by Interphase Precipitation

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Randomization of Ferrite/austenite Orientation Relationship and Resultant Hardness Increment by Nitrogen Addition in Vanadium-microalloyed Low Carbon Steels Strengthened by Interphase Precipitation