专利名称：Ferrite-austenite dual phase steel发明人：Bangaru V. N. Rao申请号：US06/595727申请日：19840402公开号：US04544422A公开日：19851001
摘要：A microalloy-free, high strength, low alloy, low carbon, manganese steelcharacterized by a dual phase microstructure wherein acicular retained austenite particlesare distributed within a ferrite matrix. The ferrite-austenite microstructure is produced bya heat treatment comprising heating the steel above the upper critical austenitetransformation temperature to produce an austenite microstructure; quenching toproduce a lath martensite microstructure; tempering at a temperature below the lowercritical austenite transformation temperature to partition carbon and manganese to formcementite particles and to transform the martensite to ferrite, thereby producing amicrostructure comprising cementite particles dispersed within a ferrite matrix; annealingat an intercritical temperature to decompose the cementite and produce austeniteparticles; and quenching to retain the austenite particles within the ferrite matrix.
申请人：GENERAL MOTORS CORPORATION
代理人：Douglas D. Fekete
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