钒对贝氏体球墨铸铁组织与硬度的影响

Effect of Vanadium on Structure and Hardness of BDI

研究了钒在连续冷却淬火贝氏体球墨铸铁中的存在形式和作用，以及对球墨铸铁贝氏体组织和性能的影响机制．结果表明：钒在贝氏体球墨铸铁中以固溶和弥散碳化物２种形式存在，它能有效地增加贝氏体形核率，促进贝氏体转变，细化贝氏体组织，强化基体，提高硬度．因此，钒可替代钼、镍、硼等元素生产贝氏体球铁．

Effect of vanadium on continuous quenching bainite ductile cast iron and its existing condition have been studied. Effect mechanism of Vanadium on structure and mechanical property of bnainite has been discussed. It has found that vanadium exists in the forms of both solid solution and dispersion carbide in continuous quenching bainite ductile cast iron. Addition of vanadium to ductile cast iron can increase the nucleation rate of bainite efficiently, facilitate the bainite transformation, refine and strengthen the matrix structure, and raise its hardness. It showed that the vanadium can be used to replace Mo,Ni and B to produce BDI.