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1.高磷低合金铸铁闸瓦材料表1为铁路工厂试制的高磷铸铁、高磷低合金铸铁、高磷球墨铸铁闸瓦材料的举例。为比较起见,表中还列有现用的铸铁闸瓦(OM),低磷高锰闸瓦(OA)和金属型铸造闸瓦(OB)。如图1所示,由于添加合金元素,高磷低合金铸铁闸瓦组织是在细珠光体基体内均匀分布片状石墨,并在珠光体晶粒间界处析出大量斯氏体相的组织。组织中对
1. High Phosphorus Low Alloy Cast Iron Brake Shoe Materials Table 1 is an example of trial production of high phosphorus cast iron, high phosphorus low alloy cast iron, high phosphorus ductile iron brake shoe materials from the railway factory. For comparison, the table also includes current cast iron brake shoes (OM), low phosphorus high manganese brake shoes (OA) and metal cast brake shoes (OB). As shown in Fig. 1, due to the addition of alloying elements, the microstructure of the high phosphorous low alloy cast iron brake shoe is that flake graphite is uniformly distributed in the fine pearlite matrix and a large amount of the microstructure of the steatite is precipitated at the boundary of the pearlite grains. Right in the organization