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研究了用CaO坩埚真空感应熔炼、再经不同的熔体过热处理后,K465铸造高温合金晶粒尺寸的变化以及合金中碳化物的形貌和分布特征。结果表明:在浇注温度相同的条件下,未经熔体过热处理时,合金晶粒为普通等轴晶,碳化物为块状MC碳化物;熔体过热处理温度在1 600～1 750℃之间时,晶粒尺寸随处理温度升高而长大,初生MC碳化物从块状转变为汉字草书体群团形式,而且呈现出温度升高,MC碳化物变细、群团变小的趋势;过热处理温度超过1 750℃时,草书体群团MC碳化物随温度升高晶粒尺寸不断减小并呈细小点状均匀分布。
The effects of CaO crucible vacuum induction melting and different melt overheating treatments on the grain size of K465 superalloy and the morphology and distribution of carbides in the alloy were investigated. The results show that when the casting temperature is the same, the alloy grains are normal equiaxed grains and the carbides are massive MC carbides without melt overheating treatment. The melt overheating temperature is between 1 600 and 1 750 ℃ In the intergranular phase, the size of the grains grows with the increase of the treatment temperature. The primary MC carbides change from massive to cursive clusters, and the temperature tends to increase, while the MC carbides become thinner and the mass of the clusters decreases When the overheating temperature exceeds 1 750 ℃, the size of curanoid MC MCC decreases with the increase of temperature and distributes uniformly in small spots.