目前,蒸汽机车仍然是铁路运输的一种主要牵引动力装置。因此,延长机车的磨损部件的使用寿命,改善机车的使用性能,具有较大的经济意义。为了提高蒸汽机车汽缸套和汽室套的耐磨性能,希望能在铸铁中析出一种特殊的硬化相。据国外资料介绍,在铸铁中加入微量硼元素,可形成碳硼化合物硬化相。该硬化相不但数量 At present, steam locomotives are still a major traction power plant for rail transport. Therefore, it is of great economic significance to extend the service life of the wear parts of locomotives and improve the serviceability of locomotives. In order to improve the wear resistance of steam locomotive cylinder liner and steam chamber sleeve, it is hoped that a special hardening phase will be precipitated in cast iron. According to foreign information, adding a trace amount of boron in the cast iron can be formed boron carbide hardening phase. Not only the amount of the hardening phase