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利用ULVAC-CCT-AY-II连续退火模拟器,探讨了合金元素C、微量Nb与退火温度对双相钢力学性能和组织的影响规律。结果显示,C与Nb对相变温度影响较小,但减少了760℃低温退火时的马氏体含量;微量Nb的加入,组织明显细化;在780℃以下退火时,易出现回复组织;在800℃以上退火时,C含量较高钢的组织中容易生成珠光体;C与Nb的加入,能提高钢的屈服强度与抗拉强度;微量Nb在提高钢强度的同时,伸长率也较未添加Nb的试验钢大;在820℃退火时,Nb微合金化双相钢的综合性能较好。
Using ULVAC-CCT-AY-II continuous annealing simulator, the effects of alloying elements C, trace Nb and annealing temperature on the mechanical properties and microstructure of dual-phase steel were discussed. The results show that the effect of C and Nb on the phase transformation temperature is small, but the martensite content at 760 ℃ annealing is decreased. The addition of trace Nb can refine the microstructure obviously. When annealed below 780 ℃, When annealed above 800 ℃, pearlite is easily formed in the steel with higher C content. The addition of C and Nb can improve the yield strength and tensile strength of steel; Compared with the Nb-free test steel, Nb microalloyed duplex steel showed better overall performance when annealed at 820 ℃.