加热及变形温度对含铌高碳钢奥氏体组织的影响
Effect of Heating and Deformation Temperature on Austenite Structure of Nb Micro-alloyed High Carbon Steel
董洪波, 王高潮
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作者单位：南昌航空大学 材料科学与工程学院, 江西 南昌 330063
中文关键字：铌； 高碳钢； 温度； 奥氏体
英文关键字：Nb; high carbon steel; temperature; austenite
中文摘要：针对铌微合金化高碳钢线材，在Gleeble-1500 热模拟实验机上研究不同加热及变形温度下奥氏体组织的变化规律。结果表明，奥氏体粗化温度为1200 ℃，在1150～1200 ℃，奥氏体晶粒平均尺寸增大约30 μm； 材料1100 ℃奥氏体化后，以40 s-1、35%变形量进行一道次压下变形，1000 ℃以上为再结晶区，900 ℃以下为未再结晶区；在900 ℃形变淬火，析出物为NbC，尺寸为20～60 nm，弥散细小的NbC析出颗粒阻碍了晶粒的长大。
英文摘要：The evolution of austenite microstructure of Nb micro-alloyed high carbon steel wire at different heating and deformation temperature was investigated using Gleeble-1500 simulator machine. The results show that the austenite coarsening temperature is 1200 ℃, and its average grain size increases by about 30 μm from 1150 ℃ to 1200℃; after austenitizing at 1100 ℃, one pass deformation is carried out with deformation of 35% and strain rate of 40 s-1. The recrystallization temperature is above 1000℃, and non-recrystallization temperature is below 900 ℃. When deforming and quenching at 900 ℃, the precipitate is NbC carbide with 20～60 nm in diameter. The fine dispersed NbC carbides inhibit grains from coarsening.