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对铸造出的K480镍基高温合金试样进行固溶处理和实效处理后,在900℃保温500-3000小时,研究合金在高温时效时微观组织随时效时间演变的行为。结果表明,热处理后的合金组织主要为锯齿形晶界、位于晶界和晶间的MC碳化物,以及尺寸均匀近立方状的γ’。随着时效时间的增长,合金的晶界明显粗化;同时,合金中的MC碳化物开始溶解,并转化为M23C6。
The cast K480 Ni-based superalloy samples after solution treatment and effect treatment, at 900 ℃ for 500-3000 hours to study the alloy microstructure with aging time evolution at high temperature behavior. The results show that the microstructures of the alloy after heat treatment are mainly zigzag grain boundaries, MC carbides located between grain boundaries and intergranular grains, and γ ’with uniform size and nearly cubic shape. With the increase of aging time, the grain boundaries of the alloy obviously coarsen; meanwhile, the MC carbides in the alloy begin to dissolve and are transformed into M23C6.