重载齿轮钢的高温性能

来源期刊：钢铁2009年第5期

论文作者：张国强 董瀚 王毛球 赵亚平 刘荣佩

文章页码：59 - 63

关键词：重载齿轮钢； 热塑性； 断裂； 第二相； 铁素体

Key words：heavy-duty gear steel； hot ductility； fracture； secondary phase； α-ferrite

摘    要：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。

Abstract: Hot ductility of 17Cr2Ni2MoVNb and 17Cr2Ni2Mo gear steels at the temperature from 600 to 1 200 ℃ was measured on stress/strain thermo-simulator Gleeble-1500D and the mechanism of crack propagation was studied.The results show that the tensile strength of the V(0.1%) and Nb(0.036%) microalloyed 17Cr2Ni2MoVNb steel was higher than that of the 17Cr2Ni2Mo steel,since microalloying elements can result in grain refinement strengthening and solution strengthening.Meanwhile,V and Nb are not detrimental to the ductility of the low N(0.005 7%)containing steel.However,hot ductility of the 17Cr2Ni2Mo steel which contains higher N(0.013 0%) was below that of the 17Cr2Ni2MoVNb steel in the test temperature range of 600-900 ℃and 1 050-1 200 ℃.The differences in N content and in temperature for phases transformation result in the distinction for precipitation of AlN and α-ferrite between 17Cr2Ni2MoVNb and 17Cr2Ni2Mo,which in turn influence the hot ductility.