【摘要】 采用高温金相显微镜观察了含铌弹簧钢60Si2MnNb（%:0.57C、1.60Si、0.76Mn、0.34Cr、0.022Nb）在950～1 250℃真空加热时奥氏体晶粒长大现象,得到其晶粒长大动力学曲线,通过Arrhenius方程对粗化过程进行了曲线拟合;通过SEM（Scanning Electron Microscope）和EDS（Energy Dispersive Spectrometer）对出现的二相粒子进行了分析。实验结果表明,含铌弹簧钢60Si2MnNb晶粒粗化温度为1 050℃,较60Si2MnA钢的晶粒临界粗化温度T_GC提高了100℃;出现的二相粒子为非金属夹杂物。更多还原

【Abstract】 The behavior of austenite grain growth of Nb-bearing spring steel 60Si2MnNb（%:0.57C,1.60Si, 0.76Mn,0.34Cr,0.022Nb） during heating at 950～1 250℃in vacuum has been observed by using high temperature microscope, and the curve of coarsening process is fitted by Arrhenius equation to get the austenite grain grovrth dynamic curve;and an analysis on occurred second phase particles has been carried out by using scanning electron microscope （SEM） and energy dispersive spectrometer（EDS）.Test results show that the grain coarsening temperature T_GC of Nb-bearing steel 60Si2MnNb is 1 050℃it is higher that of steel 60Si2MnA by 100℃;the occurred second phase particles in steel are nonmetallic inclusions.更多还原