The micro-structure of hardening layer and motherly-body is different, which provide passibility for measuring the depth of hardening layer by supersonic ware.
由于硬化层与基体的微观结构不同，也就为超声波测量硬化层的深度提供了条件。
The feature of hardening layer is usually expressed by its hardness and depth, and the micro-structure of its material is determined by the hardening process.
硬化层的特征通常由它的硬度、深度来表征。硬化层材料的微观结构又取决硬化过程。
Hardening layer depth is an important process requirements, it has great influence on the quality of products.
淬火层的深度是一个重要的工艺要求，它对产品的质量有很大影响。
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