The proposal for the next-generation microstructural control technique of steel by using ultra-fine lath austenitic starting structure

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For the production of fine-grained structural steel, the microstructural characteristics of lath austenite formed by martensitic reversion and the microstructure transformed from it were investigated. As a result, it was confirmed in a model steel that the lath austenite has fine lath structure containing high-density dislocations. In addition, it was suggested that martensitic reversion takes place even in a low alloyed steel under the specific condition controlled by alloy designing and heat treatment.