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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 k J/cm增加到20 k J/cm,冲击功值呈先下降后上升趋势。
The welding thermal cycling experiments were carried out on the three kinds of rare earth-containing boron steel plates by using the welding thermal simulation testing machine. The microstructure and impact energy values of the different welding line energies on the coarse-grained heat affected zone were analyzed by means of metallographic microscope and impact tester And determination. The results show that the addition of rare earth lanthanum and cerium reaches 0.08%, and the toughness of boron-containing steel with rare earth changes obviously. The energy input of welding line increases from 12 kJ / cm to 20 kJ / cm, and the impact energy decreases first and then increases trend.