设计了一种低碳低活化铁素体/马氏体钢，利用扫描电镜、透射电镜和拉伸实验等方法观察和测定了实验钢在不同制备工艺下的显微组织和力学性能，并对其析出物进行EDS化学成分检测，同时通过热力学计算研究了低碳低活化钢析出相的析出规律。结果表明：热轧后经980℃保温1h完全奥氏体化淬火与750℃保温1h空冷处理后，能够制备出性能达标的超低碳实验钢；析出相主要为M23C6和MX相，其中M23C6主要在950℃以下轧制和热处理过程中析出，而MX主要在轧制过程中大量析出，同时在快速冷却和热处理过程中的二次析出比较少。
A type of low-carbon reduced activation ferritic/martensitic (RAFM) steel is designed.The microstructure and mechanical properties of tested steels prepared by different technologies were investigated by means of scanning electron microscope, transmission electron microscope and tensile test. The chemical composition of precipitations of tested steels are inspected by energy dispersive spectroscopy (EDS), meanwhile the law of precipitation phase of low carbon low activation FM steel was studied by thermodynamic calculations. The results show that the best mechanical properties are obtained by tempering at 750℃for 1h after quenched from heating at 980℃for 1h.The low carbon RAFM steel meeting performance standards can be produced. The precipitations are composed of M23C6 and MX.M23C6 carbide precipitates mainly in the process of below 950℃rolling and heat treatment. However MX mainly precipitates in the process of rolling, and the secondary precipitation seldom occurs during the process of heat treatment and rapid cooling.
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