热轧冷却速率对微合金非调质钢34Mn2VN组织的影响  

Effect of Finished Rolling Cooling Rate on Structure of Microalloy Non Quenched-Tempered Steel 34Mn2VN

作　　者：张玉胜[1] 刘雅政[1] 刘照[2] 乔爱云[3] 李晓[3] 井溢农[3] 

机构地区：[1]北京科技大学材料学院,北京100083 [2]河北工程大学机电学院,邯郸056038 [3]包钢集团公司无缝钢管厂,包头014040

出　　处：《特殊钢》2006年第6期24-26,共3页Special Steel

摘　　要：用Gleeble-1500热模拟试验机研究了非调质钢34Mn2VN(%:0.30～0.34C、1.20～1.70Mn、0.014～0.018N、0.07～0.12V)在950℃、平均应变速率2s-1、应变15%后以0.1～45℃/s不同冷却速率下冷却的动态CCT曲线和组织转变。结果得出,当冷却速率控制在0.8～2.0℃/s时所得到细小的铁素体和少量贝氏体组织,具有较高的冲击韧性。生产应用表明,采用该冷却速率生产Φ139.7×7.7(mm)和Φ114.0×6.4(mm)管材的冲击功为47.8～50.9J。Dynamic continuous cooling transformation （CCT） curves and structure transition of non quenched-tempered steel 34Mn2VN （0. 30 ～ 0. 34C, 1.20 ～ 1.70Mn, 0. 014 ～ 0. 018N, 0. 07 ～ 0. 12V） at 950℃ with average strain rate 2 s^-1 and 15% strain, then cooling with 0. 1 ～ 45℃/s different rate have been studied by Gleeble-1500 thermal simulation machine. The results obtained that as cooling rate was controlled within 0. 8 ～ 2.0℃/s, the fine ferrite and minor bainite structure was obtained, it had higher impact toughness. Commercial production application showed that the impact energy of Ф139.7 × 7.7 （mm） and Ф114. 0 × 6.4 （mm） steel tubes produced with that cooling rate was 47. 8 ～ 50.9 J.

关 键 词：非调质钢34Mn2VN 动态CCT曲线 组织 冲击韧性 

分 类 号：TG335.11[金属学及工艺—金属压力加工]