低合金高强度钢中铌的析出对高温塑性的影响  

The Effect of Nb Carbonitride Precipitates on Temperature Performance in Low Alloy High Strength Steel

作　　者：徐志[1] 范植金[1] 黄静[1] 

机构地区：[1]武汉钢铁(集团)公司研究院,湖北武汉430080

出　　处：《武汉工程职业技术学院学报》2012年第4期13-15,共3页Journal of Wuhan Engineering Institute

摘　　要：在Thermecmastor-Z热模拟试验机上进行了铌微合金化低合金高强度钢的高温拉伸试验,采用二次复型法在JEM-2000FXⅡ型透射电镜观察了不同温度的析出相。结果表明,当温度下降低于1000℃后,钢中铌的析出物逐渐增加,钢的塑性开始下降。冷却至900℃以下后,钢的性能变化显著,塑性低,使钢容易产生裂纹缺陷。Hot tensile strenth of niobium microalloying low alloy high strength steel is tested with Thermecmastor-Z thermal simulator. Precipitates of different temperatures are observed using JEM- 2000FX Ⅱ transmission electron microscope in the double replica method. Results show that when temperature is below 1000℃, with the increase of NbC precipitates in the steel, the plasticity is gradually reduced. The plasticity becomes bad when the temperature is below 900℃, and crack defects appear easily.

关 键 词：含铌钢 析出 高温塑性 微合金化 低合金高强度钢 

分 类 号：TG142.13[一般工业技术—材料科学与工程]