利用焊接热模拟试验机对3种含稀土硼钢板进行焊接热循环实验，运用金相显微镜、冲击试验机等手段对不同焊接线能量对粗晶热影响区的显微组织和冲击功值进行分析和测定。结果表明：稀土镧和铈的加入量达到0.08％，含稀土硼钢的韧性出现明显转变；焊接线能量输入从12 kJ/cm增加到20 kJ/cm，冲击功值呈先下降后上升趋势。
The welding thermal circulation experiments of three boron steel plates containing rare earth were performed by thermo/mechanical simulator. Microstructure and impact toughness of coarse grain heat affected zone(CGHAZ)were investigated by OM and impact testing machine. The results show that obvious toughness change of boron steel containing rare earth is found when the added rare earth content reaches 0.08%. For weld heat input increasing from 12 to 20 kJ/cm,the toughness of the steel plate has a tendency to decrease first and then increase.
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