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

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。