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在未加镧和添加镧两种成分高铌钢的基础上,应用Gleeble-1500D热模拟试验机进行压缩试验,得到了试验钢在900℃等温弛豫时的应力松弛曲线。运用Thermo Icap6300电感耦合等离子体原子发射光谱仪、ZEISS Supra55型场发射扫描电子显微镜和Tecnai F30场发射透射电子显微镜,研究了试验钢弛豫淬火后铌的固溶量、含铌相析出行为的变化规律。结果表明,La抑制了含铌相在900℃(奥氏体区)的析出动力学过程,延长了含铌相在900℃(奥氏体区)的应变诱导析出开始时间(约14 s)及结束时间(约36 s)。当加热温度为1250℃时,La使加热过程中铌的固溶量百分比提高30.6%。等温弛豫后,La使等温弛豫过程中铌的析出量百分比增加了29.6%,析出物颗粒尺寸有所粗化。
Based on the high niobium steel with neither lanthanum nor lanthanum added, the Gleeble-1500D thermal simulator was used to carry out the compression test. The stress relaxation curve of the test steel at 900 ℃ is obtained. Thermo Icap6300 inductively coupled plasma atomic emission spectrometer, ZEISS Supra55 field emission scanning electron microscope and Tecnai F30 field emission transmission electron microscope were used to study the variation of niobium solid solution and the precipitation behavior of niobium-containing phases in the test steel after relaxation and quenching . The results show that La suppresses the precipitation kinetics of the niobium-containing phase at 900 ℃ (austenite region) and prolongs the strain-induced precipitation initiation time (about 14 s) of the niobium-containing phase at 900 ℃ (austenite region) and End time (about 36 s). When the heating temperature is 1250 ℃, La increases the percentage of solid solution of niobium during heating by 30.6%. After isothermal relaxation, the amount of niobium precipitated by La increased by 29.6% during the isothermal relaxation process, and the particle size of the precipitates became coarse.