论文部分内容阅读
1.前言为了满足机车车辆高速化和维修简单化要求,含有斯氏体和渗碳体硬质相的高磷或高锰作为摩擦系数高、磨损率低的铸铁闸瓦已经进入实用阶段。但是,闸瓦一旦含有硬质扣,就常常会因滑动摩擦热的作用导致热裂发生,增加闸瓦破裂的可能性,所以,必须采用在闸瓦背面镶上金属瓦背等措施加以解决。今后,为了在高速车辆和机车上使用,还必须对铸铁闸瓦的热裂采取更有效的措施。本文作为从材质方面来改善耐热裂性能的尝试,对低碳球墨铸铁和含铜铸铁进行了热冲击试验,并对其效果进行了调查。
1. Introduction In order to meet the requirements of high-speed rolling and maintenance of rolling stock, high-phosphorus or high-manganese, which contains hard phase of martensite and cementite, has been put into practical use as a cast-iron brake shoe with high friction coefficient and low wear rate. However, once the brake shoe has a hard buckle, it often causes the thermal cracking due to the sliding frictional heat and increases the possibility of the brake shoe rupturing. Therefore, it is necessary to solve the problem by installing the metal shoe back on the back of the brake shoe. In the future, in order to be used on high-speed vehicles and locomotives, more effective measures must be taken on the thermal cracking of cast iron brake shoes. As an attempt to improve hot crack resistance from the material aspect, this paper carried out thermal shock tests on low-carbon ductile iron and copper-containing cast iron, and investigated their effects.