稀土对低碳高铌钢相变行为及组织的影响

发布时间：2018-03-24 02:06

  本文选题：稀土　切入点：低碳高铌钢　出处：《稀土》2015年01期

【摘要】：利用L78 RITA热膨胀相变仪研究了不同冷速下稀土对低碳高铌钢相变行为的影响,并结合金相法绘制了加稀土和未加稀土两种成分试验钢的连续冷却相变曲线,分析了稀土对连续冷却组织的影响规律。试验结果表明,稀土加入低碳高铌钢后使连续冷却相变曲线向右移动,在相同冷速下显著降低了奥氏体向铁素体转变的开始温度,并且随着冷速的增加使降低程度增大。冷速从0.1℃/s增加到15℃/s时,加稀土的低碳高铌相变开始温度点下降了90℃,而未加稀土的下降了52℃;另一方面,稀土对低碳高铌钢在0.1℃/s到1℃/s冷速下的组织有较大影响,促进了针状铁素体的转变,并能在冷速增至5℃/s后使其更易获得板条状贝氏体组织。
[Abstract]:The effect of rare earth on the phase transformation behavior of low carbon high niobium steel at different cooling rates was studied by L78 RITA thermal expansion phase transformation instrument. The continuous cooling phase transformation curves of the steel with and without rare earths were drawn by metallographic method. The effect of rare earth on the structure of continuous cooling is analyzed. The experimental results show that the phase transformation curve of continuous cooling moves to the right after adding rare earth to low carbon high niobium steel, and the starting temperature of austenite to ferrite transition is significantly reduced at the same cooling rate. When the cooling rate increased from 0.1 鈩，

本文编号：1656207