所谓的白层结构是指那种表层经普通的腐蚀液腐蚀后,在一般的光学显微镜下呈白色。一般认为,白层结构的特点是难腐蚀,高硬度和高耐磨性。然而白层的显微结构是随其原始结构和白层所产生的条件而变的。 白层可以由机械加工形成;可以在工程中使用的部件表面出现;或是在实验室测试的试样表面上发现。一般来说,白层产生的机理有以下三条:1.快速淬火效应所引起的相变;2.与环境引起的表面化学反应;3.塑性变形所导致的极细小组织的形成。 白层的显微硬度视原始结构和白层产生条件的不 The so-called white-layer structure refers to the kind of surface corrosion by the ordinary corrosive, under general optical microscope was white. Generally believed that the white layer structure is characterized by hard corrosion, high hardness and high wear resistance. However, the microstructure of the white layer changes with the original structure and the conditions of the white layer. The white layer can be formed by machining; it can appear on the surface of parts used in the project; or it can be found on the surface of a test specimen in a laboratory. In general, the mechanism of white layer has the following three: 1 rapid quenching effect caused by phase changes; 2 and the environment caused by surface chemical reactions; 3 plastic deformation caused by the formation of very small organizations. The microhardness of the white layer does not depend on the original structure and the white layer