Light and high-performance twin crystal inducing plasticity steel and preparation method thereof

Abstract

The invention provides light and high-performance twin crystal inducing plasticity steel, which comprises the following chemical compositions: 0.30 to 0.80 percent of C, less than or equal to 0.4 percent of Si, 15 to 25 percent of Mn, less than or equal to 0.05 percent of Al, 0.04 to 0.16 percent of P, 0.10 to 0.30 percent of Re, 0.01 to 0.02 percent of N and the balance of Fe. A preparation method comprises that: 1) vacuum melting is adopted and the tapping temperature is between 1,450 and 1,550DEG C; 2) a cast ingot is subjected to hot rolling, the initial temperature is between 1,150 and 700DEG C, the finishing temperature is more than or equal to 550 DEG C, and the cold rolled reduction ratio is between 40 and 80 percent; and 3) the annealing is performed at a temperature of between 600 and 1,000DEG C, and the steel is kept at a constant temperature for 0.5 to 20 minutes and then cooled to room temperature in a rate of 5 to 20 DEG C / s. Through composition design, the preparation method controls the casting, directly performs hot rolling and cold rolling for forming, and combines a heat treatment process to prepare the high-performance TWIP steel of which the strength and toughness balance is more than 40,000MPa percent. The light and high-performance twin crystal inducing plasticity steel is not added with silicon, aluminum and precious alloys, has low cost and high purity,and can avoid the defects of hot rolled billets; and the TWIP steel with different strength and plasticity can be prepared through different heat treatment systems, and the effective utilization of energy and resource can be achieved.

Description

technical field [0001] The invention belongs to the technical field of metal materials, in particular to a light-weight, high-strength and cold-formable thin steel plate with twin-induced plasticity and a preparation method thereof. Background technique [0002] Environmental protection and energy saving are increasingly becoming the dominant factors in the development of the automobile industry, and reducing vehicle weight has become an important direction for automobile development. In order to meet the requirements for safety and comfort, automobile accessories will be added, resulting in an increase in vehicle weight. In order to solve these contradictions and meet the requirements of various aspects, people have been pursuing the balance of steel strength and ductility for decades. The use of high-strength and ultra-high-strength steel plates in car body parts has become the development trend of modern automotive steel. Steel (HSS) is used to replace mild steel, and DP ...

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Problems solved by technology

[0005] In the patent whose publication number is CN 101111622A, titled "Austenitic steel with high strength and formability, method for manufacturing said steel and its application", in order to make the cold-rolled sheet meet the performance requirements, it is necessary to adopt a long Batch annealing for more than 4 hours not only increases energy consumption and production cost, but also greatly reduces production efficiency and prolongs product production cycle

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