Abstract
	The conformity result of ultrasonic  tests is one of the main quality criteria of large-size free forgings.
	The ultrasonic test is specified for both quantity and size checking of internal defects in material where all defects of non-entirety nature  are not permissible.  In general, it  is necessary to complete this test with a complex metallographical analysis in order to specify them in  more details.
	Presented contribution is specialized in more detailed describtion one of typical internal discontinuities in large-size  forgings  that was identified generally in the literature as "cracks in segregates".
	The cracks in segregates are  very similar to flakes from the morphological point of view when macroscopically estimated so they can easily cause a confusion.
	The doubtless differentiation /resolution/ is  possible only by means of the electron microscopy.
	Based on long-term observation of two carbon steel types and medium alloyed steel it was found that major of discontinuities detected by the ultrasonic test is of non-entirety nature being  located in interdendritic area.  Macroscopically  they looked like bright areas of various shapes. In any case no dominant fracture pattern qualifying them as "cracks" was observed on their surface. These defects were characterized by so-called free surfaces (i.e. never contacted) that are typical for primary metallurgical defects of a microshrinkage cavity type or other holes which were extended only but not connected in the time of shaping.
	Because of this reason the name for their identification was proposed as "discontinuities in segregates".