通过Gleeble-1500D热模拟试验机高温拉伸试验,对比研究了17Cr2Ni2MOVNb和17Cr2Ni2Mo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,17Cr2Ni2MoVNb钢的抗拉强度比17Cr2Ni2Mo钢稍高.在低N(0.005 7%)含量的17Cr2Ni2MOVNb钢中,V和Nb对热塑性的危害很小.而高N(0.0130%)含量的17Cr2Ni2Mo钢在600~900℃及1050~1 200℃温度区间塑性低于17Cr2Ni2MoVNb钢.N含量及相变温度不同导致第二期AlN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.
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