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本文对10、20Cr钢两种成份的双相钢,在不同组织状态下,对时效后的组织与性能进行了全面研究、利用透射电镜对时效组织进行了分析,室温状态时效,在铁素体基体上有大量淬火空位聚集而形成的位错环,没有第二相析出。在150℃时效,以及200℃回火,10钢中铁素体基体上析出ε碳化物。性能试验表明:在室温下时效,强度和延性都不断提高,150℃时效,10钢的σ_a不断上升,σ_b缓慢下降,延性有很大恢复。20Cr双相钢的σ_a,σ_b都不断上升,同时延性有一定的恢复。在淬火状态,双相钢有较大的脆性,这种脆性是由于淬火空位与位错的交互作用以及铁素体中碳原子在{001}_α面上偏聚造成的。150℃时效以及200℃回火可以消除这种脆性。
In this paper, two-phase steels with two compositions of 10 and 20Cr steel were studied under different microstructures. The microstructures and properties of the dual-phase steels after aging were studied. The aging microstructures were analyzed by transmission electron microscopy. The matrix has a large number of quenching vacancies formed by the dislocation ring formed, there is no second phase precipitation. Aging at 150 ℃, and tempering at 200 ℃, 10 steel ferrite matrix precipitates ε carbides. Performance tests show that: aging at room temperature, strength and ductility are increasing, 150 ℃ aging, σ_a 10 steel continues to rise, σ_b slow decline, ductility has been greatly restored. 20Cr duplex steel σ_a, σ_b are rising, while a certain degree of ductility recovery. In the quenched state, dual phase steels have greater brittleness due to the interaction between quench vacancies and dislocations and the partial clustering of carbon atoms in the ferrite on the {001} _α surface. 150 ℃ aging and tempering at 200 ℃ can eliminate this brittleness.