QP980

"The main purpose of the development of advanced high strength steels to reduce body mass in order to meet the automotive industry to reduce fuel consumption, while increasing the safety of passengers in the car is currently being applied and research of advanced high strength steels are: the first generation of advanced high strength steel - double. phase (DP) steels, multiphase (CP) and phase transformation induced plasticity steel (TRIP) steels, and the second generation of advanced high strength steels - austenitic twinning induced plasticity (TWIP) steels, induced plasticity Strut (L- IP) and shear zone strengthening (SIP) steel. The first generation of advanced high strength low alloy steel content, mainly in the ferrite-based multi-phase microstructure of duplex steel is currently the most used an advanced high-strength steel, in addition to high strength, good formability, but also has the advantage of ease of welding and machining of steel .TRIP both good strength and elongation properties, the residual austenite phase by phase transformation strain induced transformation to martensite phase, thus increase the strain hardening exponent. Excellent second generation of advanced high strength steel and mechanical properties, but high alloy content of austenitic steels, making the cost of greatly increased in recent years developed a new technology in the world of steel heat treatment, known as Q & P processing ( quenching and redistribution of carbon treatment), to obtain a high strength and good ductility and a combination of new steels, their mechanical properties achieved as follows: tensile strength 800 ~ 1500MPa, an elongation of 15% to 40%, are believed to be novel generation of advanced high strength steel. traditional quenching and tempering process is used to produce martensite containing high-strength steel. quenched martensite formation can improve the strength of steel, tempered eliminate stress, and martensite within precipitation of carbides and residual austenite decomposition to adjust some plastic toughness studies reveal: the quenching process, under certain conditions, carbon allocation from martensite to austenite will occur, making martensite strip between due to increased carbon retained austenite and get stabilized, and the final steel to increase the amount of retained austenite, thereby making it possible to improve the overall performance of the strength and toughness of steel. "