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采用金相显微镜、扫描电镜(SEM)、初熔实验等方法对不同杂质元素含量的定向凝固镍基高温合金DZ125L微观组织和铸造性能进行了详细的分析。研究结果表明,杂质元素含量较高的合金中显微疏松、夹杂数量增多,且会导致合金中大量生成以氮化物或氧化物为核心的碳化物;杂质元素含量的升高会导致DZ125L合金初熔温度的降低,并会导致合金的铸造工艺性能变差,热裂倾向性明显增加。
The microstructures and casting properties of DZ125L solidified by directional solidification of different content of impurity elements were analyzed by metallographic microscope, scanning electron microscope (SEM) and primary melting experiment. The results show that the higher the content of impurities in the alloy is slightly loose, increasing the number of inclusions, and will lead to a large number of alloy nitride or oxide-based carbide; impurity element content will lead to early DZ125L alloy Lower melting temperature, and will lead to alloy casting process performance deterioration, thermal cracking tendency significantly increased.