铌钛与铌钒微合金化钢的高温塑性  

High temperature plasticity of Nb-Ti and Nb-V microalloyed steel

作　　者：樊超 杨忠民[1] 陈颖[1] 王慧敏[1] 张斌[1,2] 

机构地区：[1]钢铁研究总院工程用钢所,北京100081 [2]中国石油大学(北京)理学院,北京100081

出　　处：《金属热处理》2018年第1期28-32,共5页Heat Treatment of Metals

基　　金：中信-CBMM铌钢R&D资助项目(2015-D081)

摘　　要：在Gleeble-1500热模拟试验机上进行了Nb-Ti与Nb-V复合微合金化钢的高温拉伸试验,并用Thermo-Calc软件计算了两种试验钢不同析出相的析出温度,结合断口形貌对比分析了两种钢的高温塑性特点。结果表明：根据断面收缩率的变化规律,可以将Nb-Ti与Nb-V复合微合金化钢的整个塑性温度区间分为第Ⅰ脆性区、高塑性区和第Ⅲ脆性区,其中Nb-Ti钢的塑性区间温度范围分别为1320℃~熔点,880~1320℃和715~880℃;Nb-V钢塑性区间温度范围是1310℃~熔点,905~1310℃和705~905℃。Thermo-Calc软件计算结果表明钛元素对Al N的析出有较强的抑制作用,同时也抑制了微细Nb（C,N）的析出,能够改善含铌微合金钢的高温塑性;Nb-V钢第Ⅲ脆性区温度范围较Nb-Ti钢更宽,整体断面收缩率更差。High temperature tensile test of Nb-Ti and Nb-V microalloyed steels was carried out on Gleeble-1500 thermal simulation testing machine and different precipitation temperatures of the two tested steels were calculated by Thermo-Calc software,compared and analyzed high temperature plastic characteristics combining with the fracture morphology. The results show that according to the change regulation of the section shrinkage,the whole plastic temperature range of Nb-Ti and Nb-V microalloyed steels can be divided into the first brittle zone,the high plastic zone and the third brittle zone. The plastic temperature ranges of the Nb-Ti steel are 1320 ℃ to the melting point,880-1320℃ and 715-880 ℃; the plastic temperature ranges of the Nb-V steel are 1310 ℃ to the melting point,905-1310 ℃,and 705-905 ℃.Thermo-Calc software calculation results show that the Ti has strong inhibition to the precipitation of Al N,as well as inhibits the precipitation of the fine Nb（ C,N）,which improves the high temperature plasticity of Nb microalloyed steel. The third brittle temperature zone of Nb-V steel is wider than Nb-Ti steel,and overall rate of contraction section is worse.

关 键 词：钒 钛 复合微合金化钢 高温塑性 断口形貌 

分 类 号：TG142.3[一般工业技术—材料科学与工程]