淬透性作为白口铸铁的重要基本特性，其高低直接决定了白口铸铁的工程应用价值，因此一直是该领域的 重要研究方向。 通过研究Fe-Cr-B白口铸铁的组织、硬度、淬透性曲线及CCT曲线等，讨论了硼加入量极高情况下的淬 透性问题。研究表明，硼的加入绝大部分形成硼化物，基体中含量极低，而基体中少量硼的存在有利于提升材料淬透性， 促使铸态基体转变为马氏体。端淬实验及CCT曲线的测定也证明了Fe-Cr-B白口铸铁具有优异的淬透性。采用分子动 力学对硼在基体的含量进行计算，其含量在1×10-4％量级别，在该含量范围内，硼有利于Fe-Cr-B白口铸铁的淬透性。

The hardenability of white cast iron represents a critical fundamental property, as its level directly dictates the engineering application value of this material, thus remaining an indispensable research direction. The microstructure of the Fe-Cr-B white cast iron, hardenability curves, and CCT curves were analysed to discuss the hardenability issues when boron was added in extremely high amounts. The results show that the addition of boron mostly results in the formation of borides, and its content in the matrix is extremely low. The presence of a small amount of boron in the matrix is beneficial to the hardenability of the material, enabling the matrix to transform into martensite in the as-cast state. End quenching experiments and determination of the CCT curve also confirmed that Fe-Cr-B white cast iron has excellent hardenability. The content of boron in the matrix is calculated via molecular dynamics, and its content is at the 1×10-4％ level. Within this content range, boron is beneficial to the hardenability of Fe-Cr-B white cast iron.