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铁路辙叉使用条件恶劣,受力大,要求具有优良的抗冲击、抗疲劳和耐磨等综合性能,还要求具有良好的焊接性能。辙叉一般是用高锰钢铸造而成的,但因高锰钢需热处理,所以存在着变形、裂纹和表面脱碳等缺陷,还增加了热处理费用。而且,经热处理后的高锰钢辙叉在与铁轨安装焊接时,会在焊接热影响区形成晶间碳化物和马氏体,使材料脆性增加。为了消除脆性,必
Rail frogs with poor service conditions, large force, requires excellent impact resistance, fatigue and wear resistance and other comprehensive performance, but also requires good welding performance. Frogs are generally cast from high-manganese steel, but due to high-manganese steel to be heat-treated, there are defects such as deformation, cracking and surface decarburization, and heat treatment costs are also increased. Moreover, the heat treatment of the high manganese steel frog in rail mounting and welding, the heat affected zone will form intergranular carbide and martensite, the material increased brittleness. In order to eliminate fragility, must