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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。
A kind of high W, Mo Ni-based superalloy M963 carbide species, morphology, distribution and the resulting process conditions and formation mechanism. Experimental study found that, according to the different thermodynamic conditions of carbide, M963 alloy carbide can be divided into: genetic type carbide, spontaneous formation of carbides and precipitation of three kinds of carbide. Unmelted alloy structure coarse massive MC carbides dominated, genetic carbide distributed in the grain boundaries and dendrites. After the melt treatment, spontaneous nucleation of eutectic Chinese character carbides began to occur in the alloy. At the higher melt treatment temperature above 1850 ℃, spontaneous nucleation of non-eutectic granular carbides appeared, and spontaneous nucleation Carbides are mostly distributed among dendrites. With the increase of melt processing temperature, the order of carbide morphology change is: block → Chinese character → granular, the size of carbide is smaller and the distribution is more uniform.