论文部分内容阅读
通过向焊缝金属过渡微量的Ｔｉ－Ｂ元素，探讨了低合金高强钢焊缝金属的微观组织与低温冲击韧性的关系．研究结果表明，向焊缝金属过渡适量的Ｔｉ－Ｂ元素，可以有效地抑制先共析铁素体的析出，使焊缝获得细小、均匀的针状铁素体组织，从而提高了焊缝的低温冲击韧性．通过透射电镜的观察，发现针状铁素体由许多位错亚结构组成，这相当于进一步细化了晶粒，是提高焊缝金属低温韧性的微观原因．
Through the transition of trace Ti-B elements to the weld metal, the relationship between microstructure and low temperature impact toughness of the weld metal of low alloy high strength steel was discussed. The results show that the suitable amount of Ti-B to the weld metal can effectively suppress the precipitation of pro-eutectoid ferrite and make the weld obtain fine and uniform acicular ferrite structure, which improves the weld Low temperature impact toughness. Through the observation of transmission electron microscopy, it was found that acicular ferrite consists of many dislocated sub-structures, which is equivalent to the further refinement of the grains, which is the microscopic reason for improving the low-temperature toughness of the weld metal.