High-performance martensite and austenite dual-phase steel and preparation method thereof

• Main Authors: LIU BIN, JING XINGBIN, SUN FENG'ER, LIU HEPING, PEI HAIXIANG, JI XIUFANG, GAO YIBO
• Format: Patent
• Language: Chinese; English
• Published: 03.10.2017
• Subjects: ALLOYS; CHEMISTRY; FERROUS OR NON-FERROUS ALLOYS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUSMETALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHERTREATMENTS; METALLURGY; METALLURGY OF IRON; MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; TREATMENT OF ALLOYS OR NON-FERROUS METALS

The invention provides high-performance martensite and austenite dual-phase steel and a preparation method of the high-performance martensite and austenite dual-phase steel. The high-performance martensite and austenite dual-phase steel comprises 0.15%-0.38% of C, 1.6%-2.8% of Si, 1.8%-2.7% of Mn, 0.6%-1.5% of Cr, 2.5%-3.8% of Al, smaller than or equal to 0.01% of S, smaller than or equal to 0.01% of P and the balance Fe. The preparation method comprises the steps that steel is quickly heated to enable the temperature to be (Ac3+20) DEG C, and the temperature is kept for 5-30 minutes; quick quenching is conducted to enable the temperature to be (Ms-10) DEG C, and the staying time is 5-10 seconds; heating is conducted at the speed ranging from 0.2 DEG C/min to 1.0 DEG C/min and at the temperature ranging from (Ms-10) DEG C to (Ms+10) DEG C, continuous heating carbon distribution is conducted, and the duration is 10-100 minutes; and then quenching is conducted to enable the temperature to be room temperature, a