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.
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