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本厂生产的曲轴采用经复合孕育处理,湿型铸造,正火处理的稀土镁球墨铸铁制造.多年来,正火一直采用传统的完全奥氏体化正火工艺,见图1.采用该正火工艺,加热温度高,处理时间长,能耗大,生产效率低,易产生过热、过烧等缺陷.还会出现二次网状渗碳体,基体组织粗大,力学性能低.为此,根据生产条件,对热处理工艺参数进行了优选.1.试验材料、设备及方法(1)试验所用材料为本厂生产的稀土镁球墨铸铁曲轴,其化学成分见表1.(2)试验在MFL-3.3m自制燃煤反射炉(有效面积4m~2)中进行.(3)初选热处理工艺取化学成分,铸态组
The crankshaft produced by our factory is made of rare earth magnesium nodular cast iron with compound inoculation, wet casting and normalizing treatment. For many years, normalizing has been using the traditional complete austenitizing normalizing process, as shown in Fig. Fire process, high heating temperature, long processing time, high energy consumption, low production efficiency, easy to produce overheating, over burning and other defects. There will be secondary reticular cementite, coarse matrix, low mechanical properties.To this end, According to the production conditions, the heat treatment process parameters were optimized.Material, equipment and methods of test (1) The materials used in the experiment for the production of rare earth magnesium nodular cast iron crankshafts, the chemical composition shown in Table 1. (2) test in the MFL -3.3m self-made coal-fired furnace (effective area 4m ~ 2). (3) The primary heat treatment process to take chemical composition, as-cast group