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虽然在铸造工作者之间对控制产品显微疏松数量的方法上有一致的看法。但由于缺乏一个通用的评价高温合金形成显微疏松倾向的简单的和可比较的方法,故有必要简述一下文献中评价显微疏松程度的各种试验方法。表1(略)摘要列出一些参考资料,在每种参考资料中均报导了研究的目的,合金的特性,铸造方法,热参数和用以观察并测定显微疏松的方法。用来评价高温合金铸件中显微疏松程度的各种方法直观地看来就是:有些作者认为楔形试样纵抛光剖面观察到的所有显微孔洞均是疏松,并力图对各种高温合金显微孔洞的大小、数量,甚至形状进行比较的情况下均考虑进去。另外的作者则在关键截面上所观察到的最
Although there is a consistent view on how the foundry workers have a slightly loose control of the product. However, due to the lack of a simple and comparable method for evaluating the tendency of the superalloys to form a loose microstructure, it is necessary to briefly describe various test methods for evaluating the degree of microscopic porosity in the literature. Table 1 (abbreviated) Summary lists some references, the purpose of the study, the characteristics of the alloy, casting method, thermal parameters and the method used to observe and determine the microscopic loose are reported in each reference. The various methods used to evaluate the degree of microscopic porosity in superalloy castings appear to be intuitive: Some authors believe that all microscopic pores observed in the polished section of the wedge-shaped specimen are loose and attempt to microscopically investigate the microstructure of various superalloys Hole sizes, numbers, and even shapes are all taken into account. The other authors observed the most on the critical section