【摘要】 研究了一种高W,Mo的Ni基高温合金M963中碳化物的种类、形态、分布及产生的相关工艺条件和形成机理。实验研究发现,根据碳化物产生的热力学条件不同,可以把M963合金中出现的碳化物分为:遗传型碳化物、自发形核型碳化物和析出型碳化物三类。未熔体处理的合金组织中以粗大的块状遗传型MC碳化物为主,遗传型碳化物多分布于晶界和枝晶间。经过熔体处理后,合金中开始出现自发形核的共晶型汉字碳化物,在更高的熔体处理温度1850℃以上,出现了自发形核的非共晶型颗粒碳化物,自发形核碳化物多分布于枝晶间。随熔体处理温度的升高,碳化物形态的变化顺序为:块状→汉字形→颗粒状,碳化物的尺寸变小,分布更加均匀。更多还原

【Abstract】 The type,morphology,distribution of carbides of M963 nickel-base superalloy with high content of W,Mo was investigated. According to the different thermodynamic conditions of carbides, the type of carbides of M963 alloy could be divided into inherited carbide, spontaneous nucleated carbide and precipitated carbide. The inherited coarse faceted MC-type carbide was the main carbide, located at grain boundaries or interdendritic regions. Once the melt homogenized, the Chinese script-type carbide in spontaneous nucleated eutectic appeared, the spontaneous nucleated non-eutectic blocky carbide appeared when the temperature is over 1850℃, the Chinese script-type carbide located at interdendritic regions. With the rise of temperature, the sequence of the morphology of carbide was: faceted→Chinese script→blocky, the carbide became smaller and distributed more uniformly.更多还原