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对不同O,N和Ni含量的0Cr25Ni7Mo4N双相不锈钢进行了1200℃,4道次热轧实验.利用OM,SEM和EBSD观察分析了实验钢的组织和夹杂物.结果表明,低O,N和Ni含量的实验钢热轧塑性良好.O含量为0.0059%的实验钢中夹杂物主要为Al2O3和MgO·Al2O3,分布于晶粒内部,未对热塑性造成不良影响.O含量为0.038%和0.046%的实验钢则发生了轧制边裂,开裂处为a/g相界,相界内的大颗粒Cr2O3和MnO2夹杂是造成开裂的主要原因.其中O含量较低(0.038%)的实验钢,由于N和Ni含量过高,使钢中g相体积分数在热轧状态时高达60%.过多的g相降低了g晶粒内部的总应变量,使其不足以发生再结晶软化,最终造成更严重的热轧开裂.
The 0Cr25Ni7Mo4N duplex stainless steels with different content of O, N and Ni were subjected to hot rolling at 1200 ℃ for 4 times.The microstructures and inclusions of the experimental steels were observed and analyzed by using OM, SEM and EBSD.The results showed that low O, N and Ni The Ni content of the experimental steel hot rolling plasticity good .O content of 0.0059% of the experimental steel inclusions mainly Al2O3 and MgO Al2O3, distributed in the grain, without adverse effects on the thermoplastic.O content of 0.038% and 0.046% Of the experimental steel is rolled edge cracking, crack at the a / g phase boundary, the phase boundary of the large particles of Cr2O3 and MnO2 inclusions is the main reason for the cracking caused by the low content of O (0.038%) of the experimental steel, Due to the high content of N and Ni, the volume fraction of phase g in steel reaches as high as 60% in the hot rolling state.The excessive amount of g phase reduces the total amount of internal strain in the g grains and renders them insufficient for recrystallization and softening, Cause more serious hot-rolled cracking.