Versatile fluidity test model for cast superalloys and comparison between IN718 and IN939  

铸造高温合金通用的流动性测试模型及IN718和IN939流动性的比较

作　　者：Jun ZHANG Zi-qi JIE Miao-nan LIU Min GUO 张军;介子奇;刘淼楠;郭敏(西北工业大学凝固技术国家重点实验室,西安710072;西安工业大学材料与化工学院,西安710021)

机构地区：[1]State Key Laboratory of Solidification Processing,Northwestern Polytechnical University,Xi’an 710072,China [2]School of Materials Science and Chemical Engineering,Xi’an Technological University,Xi’an 710021,China

出　　处：《Transactions of Nonferrous Metals Society of China》2024年第9期2881-2888,共8页中国有色金属学报（英文版）

基　　金：support from the National Natural Science Foundation of China(Nos.52031012,51904218)。

摘　　要：A spiral fluidity test model of superalloys with 10 mm in height and 3 mm in thickness was designed to evaluate the fluidity of two distinct Ni-based superalloys IN718 and IN939.The factors influencing fluidity are ascertained through comparative analysis utilizing methodologies such as JMat Pro,differential scanning calorimetry and high-temperature confocal laser scanning microscopy.The results show that under identical testing conditions,the fluidity of the IN939 superalloy surpasses that of the IN718 superalloy.When subjected to the same temperature,the melt viscosity and surface tension of IN939 superalloy are considerably reduced relative to those of IN718 superalloy,which is beneficial to improving the melt fluidity.Furthermore,the liquidus temperature and solidification range for the IN939 superalloy are both smaller compared with those of the IN718 superalloy.This condition proves advantageous in delaying dendrite coherency,thereby improving fluidity.设计高10 mm、厚3 mm的高温合金螺旋流动性测试模型,以评估两种不同的镍基高温合金IN718和IN939的流动性。利用JMat Pro、差示扫描量热法和高温共聚焦激光扫描显微镜等方法进行对比分析,确定影响流动性的因素。结果表明,在相同的实验条件下,IN939高温合金的流动性优于IN718高温合金。在相同温度条件下,IN939高温合金熔体的黏度和表面张力远低于IN718高温合金,有利于提高熔体的流动性。此外,IN939高温合金的液相温度和凝固区间均小于IN718高温合金。这种条件有助于延缓枝晶搭接,提高熔体流动性。

关 键 词：FLUIDITY solidification range SUPERALLOYS surface tension VISCOSITY 

分 类 号：TG21[金属学及工艺—铸造]