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回顾了良好成型性的高强度微合金钢的成分设计和形变热处理。通过添加Ti或Ti+B复合添加使奥氏体晶粒优化,加之在轧材输出及卷取过程中进行恰当控轧和控冷可以获得拉伸强度超过1200MPa的马氏体钢。业已发现添加Si会降低材料对卷取温度变化的敏感性,从而也减少了力学性能值的离散。研究还发现,由于这些钢的强度较高,因此可以以较薄和较轻的型材用于汽车的安全关键部件,由于无需附加的热处理工序,因此马氏体钢种可降低生产成本。还对微合金化元素Nb及Ti对双相钢和TRIP钢性能的影响进行了探讨。
The compositional design and deformation heat treatment of high formability microalloyed steels with good formability are reviewed. By adding Ti or Ti + B composite addition of austenite grain optimization, combined with the rolling material output and coiling in the process of controlled rolling and controlled cooling can be obtained tensile strength of more than 1200MPa martensitic steel. It has been found that the addition of Si reduces the susceptibility of the material to coiling temperature changes and therefore also reduces the dispersion of mechanical properties. The study also found that due to the higher strength of these steels, they can be used in the safety-critical components of automobiles in thinner and lighter sections, and the martensitic steels can reduce production costs as no additional heat treatment steps are required. The effects of micro-alloying elements Nb and Ti on the properties of duplex steel and TRIP steel were also discussed.