采用SEM、TEM、HRTEM、物理化学相分析法研究了回火温度对Fe-Co-Ni-Cr-Mo-W系2200 MPa级二次硬化型超高强度钢的析出相及力学性能的影响。结果表明，试验钢在回火过程中具有明显二次硬化现象；抗拉强度、屈服强度在490、530℃达到峰值，峰值强度分别为2243、1859 MPa；试验钢在510℃具有较好的综合力学性能，抗拉强度为2185 MPa，屈服强度为1859 MPa，冲击功为35 J；在400～440℃回火时，马氏体板条内和板条界处析出大量粗大的层片状渗碳体；回火温度高于470℃时，板条内析出大量均匀弥散分布的细小M2C碳化物及少量的laves相Fe2W，这是产生二次硬化现象的原因；随着回火温度的升高，M2C型碳化物中的钼、钨元素质量分数增加，铁、铬质量分数降低。
The effect of tempering temperature on the precipitates and mechanical properties of a Fe-Co-Ni-Cr-Mo-W 2 200 MPa secondary hardening ultra-high strength steel was studied by means of SEM,TEM,and physical chemical phase analysis. The results show that the steel had apparent phenomenon of secondary hardening during tempering. The tensile strength and yield strength reached peak at 490 and 530℃,and the peak strengths were respectively 2 243 and 1 859 MPa. The testing steel had good mechanical properties at 510℃. The tensile strength,the yield strength and the impact energy were respectively 2 185 MPa,1 859 MPa and 35 J. When the temperature reached at 400-440℃,much more coarser cementite laminas were precipitated in and among martensitic laths. Because of the phenomenon of second-ary hardening,when the temperature exceeded 470℃,the martensite lath precipitated a large number of uniformly dis-tributed M2C carbides and a small amount of Laves phase-Fe2W. With the increasing of tempering temperature,the con-tent of Mo and W elements increased,and the content of Fe and Cr decreased in type M2C carbide.
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