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在设计与生产中选用材料时,除了必要的力学计算以外,还需要考虑材料的淬透性尺寸效应、纤维流线、残余应力及缺口效应。其中淬透性与尺寸效应是最主要的,也是最基本的。淬透层深度则综合地反映了淬透性与尺寸效应,因此,在选用结构钢时,对钢的淬透层深度应给予重点考虑。在冷却强度H一定的淬火介质下各种钢材的淬透层深度可以根据有关图表或“钢的直径-淬透层深度曲线”求到。但是,由于在实际情况下淬火介质冷却强
In the design and production of materials used in the selection, in addition to the necessary mechanical calculations, but also need to consider the material size effect of hardenability, fiber flow lines, residual stress and notch effect. Hardenability and size effect of which is the most important, but also the most basic. The depth of the hardened layer reflects the hardenability and size effect synthetically, therefore, the depth of hardened steel should be given the key consideration in the selection of structural steel. The depth of hardened layer of various steels under the quenching medium with a certain cooling strength H can be obtained from the relevant chart or “Diameter of steel - Depth of hardened layer”. However, due to the fact that quenching medium cooling is strong