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通过Gleeble-1500D热模拟试验机高温拉伸试验,对比研究了17Cr2Ni2 MoVNb和17Cr2Ni2 Mo钢的高温性能。结果表明:因微合金元素V(0.1%,质量分数,下同)、Nb(0.036%)产生细晶强化及固溶强化,17Cr2Ni2 MoVNb钢的抗拉强度比17Cr2Ni2 Mo钢稍高。在低N(0.0057%)含量的17Cr2Ni2 MoVNb钢中,V和Nb对热塑性的危害很小。而高N(0.0130%)含量的17Cr2Ni2 Mo钢在600～900℃及1050～1200℃温度区间塑性低于17Cr2Ni2 MoVNb钢。N含量及相变温度不同导致第二期Al N析出量不同及铁素体先后析出,是造成两试验钢塑性差别的主要原因。
The high-temperature properties of 17Cr2Ni2 MoVNb and 17Cr2Ni2 Mo steel were compared by Gleeble-1500D thermal simulation testing machine. The results show that the tensile strength of 17Cr2Ni2 MoVNb steel is slightly higher than that of 17Cr2Ni2Mo steel due to fine grain strengthening and solution strengthening of microalloying elements V (0.1%, mass fraction) and Nb (0.036%). In the low N (0.0057%) content of 17Cr2Ni2 MoVNb steel, V and Nb thermoplasticity is very small. The 17Cr2Ni2 Mo steel with high content of N (0.0130%) had lower plasticity than that of 17Cr2Ni2MoVNb steel at 600-900 ℃ and 1050-1200 ℃. N content and phase transition temperature lead to the second phase of precipitation of different amounts of AlN and ferrite has precipitated, is the main reason for the difference between the two test steel.