تحسين اداء لقمة المكبح المستخدمة في نظام الفرملة للقطار

This study includes a work to improve the performance of brake shoe which is used in rail, where it depends on heat treatment to brake shoe which is made ​​of gray cast iron, which makes the occurrence of the largest dissolve of the carbon in austenite. It allows obtaining a new crystalline structure of cast iron which has high toughness and high wear resistance. It increases the life service of brake shoe, and increases safety factor on rail way.   The test results were compared to the heat treated samples with samples that were not subjected to heat treatment, and treatment processes gave good results that allow to apply these operations on bits currently used on the railway network in Syria.