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成层的特点是在横向试样断口中有象树一样的层状结构,在纵向试样断口中有分层。在很多情况下无论是顺着纤维,或是横着纤维方向都能发现分层。《成层》和《分层》这两个概念还区分得不够明确。分层是一种金属组织缺陷)破坏了金属组织的连续性),能用超声波探伤和x光探伤两种方法查明。而成层没有破环金属组织的连续性,仅在断口上以分层的形式表现出来。成层通常是用有塑性不同的间层
Stratification is characterized by a tree-like layered structure in the transverse specimen fracture, with delamination in the longitudinal specimen fracture. In many cases stratification can be found either down the fiber or across the fiber. The concepts of “stratification” and “stratification” are also not clearly defined. Stratification is a metallic tissue defect that undermines the continuity of metallic structures) that can be identified by both ultrasonic flaw detection and x-ray flaw detection. However, there is no continuity of broken-layer metal structure in stratification, which is only shown in the form of stratification on the fracture surface. Stratification is usually the use of different layers of plastic