摘要
高温合金结构件逐渐向复杂化和薄壁化发展,在铸造过程中易出现欠铸及疏松等缺陷。基于上述问题,通过ProCAST模拟及实验验证的方法,研究了Mg微合金化对K492M高温合金铸造性能及热物性参数的影响,揭示了Mg元素对流动性和疏松缺陷的影响机理。结果表明,添加Mg元素可有效提高K492M合金流动性,同时降低疏松缺陷。Mg含量为0.01%(质量分数)时,流动性明显提高,相较于母合金流动性提高了32.9%,且疏松缺陷从0.033%降至0.005%。其作用机理主要在于Mg元素使得K492M合金凝固温度区间减小,黏度降低,有利于提高液相流动性;同时,Mg元素的加入使得剩余液相量和碳化物尺寸增加以及黏度降低,从而降低了合金的疏松缺陷。
Superalloy components are constantly evolving toward more complex structures and thin-walled designs,and misrun and microporosity potentially result from the casting process.In response to the above issues,ProCAST simulations and experiments were used to investigate the castability of the Mg microalloyed K492M superalloy,and the influence mechanism of Mg on fluidity and microporosity defects was also revealed.The results show that the addition of Mg can efficiently improve the fluidity of the K492M superalloy and reduce microporosity.The longest fluidity is obtained when the content of Mg is 0.01 wt.%,which is approximately 32.9%greater than that of the master alloy,and the microporosity decreases from 0.033%to 0.005%.The mechanism is that the solidification temperature range and viscosity are reduced in the Mg microalloyed K492M superalloy,which is conducive to improving the melt fluidity.Moreover,the size of the carbides and remaining liquid phase quantity increase,and the viscosity decreases,which is beneficial for reducing the microporosity.
作者
周煜晗
杨文超
张丽辉
谢君
张彦超
邢伟杰
付文磊
樊晓光
ZHOU Yuhan;YANG Wenchao;ZHANG Lihui;XIE Jun;ZHANG Yanchao;XING Weijie;FU Wenlei;FAN Xiaoguang(State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi'an 710072,China;Science and Technology on Advanced High Temperatures Structural Materials Laboratory,Beijing 100095,China;Institute of Metal Research,Chinese Academy of Sciences High Temperature Structural Materials Research Department,Shenyang 110016,China)
出处
《铸造技术》
2025年第4期354-361,共8页
Foundry Technology
基金
中国航空发动机集团有限公司自主创新专项基金(ZZCX-2022-040)
凝固技术国家重点实验室开放课题(SKLSP202323)。
