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化学热处理及其他表面处理等表面强化方法,能够明显地提高机件及工模具的使用寿命,节约价格较高的金属材料,因而得到广泛的重视。这些表面硬化法的共同特点是:(1)硬化层的硬度很高,多数在HV1000以上;(2)硬化层薄,一般只有0.001～0.01mm数量级。目前检查高硬度的薄硬化层机械性能的主要方法是:(1)用维氏硬度测量硬化层的表面硬度;(2)用维氏显微硬度测量硬化层、过渡层、基体的硬度、硬度分布,确定硬化层深度。测量表面硬度时,由于塑性变形影响的范围约等于压痕深度的10倍(有的认为是压痕深度的8倍),测
Chemical heat treatment and other surface treatment methods such as surface strengthening, can significantly improve the life of parts and tooling, saving more expensive metal materials, which received widespread attention. The common features of these surface hardening methods are: (1) the hardness of the hardened layer is high, mostly above HV1000; (2) the thickness of the hardened layer is generally on the order of 0.001 to 0.01 mm. At present, the main methods for checking the mechanical properties of thin hardened layers with high hardness are: (1) measuring the surface hardness of the hardened layer with Vickers hardness; (2) measuring the hardness and hardness of the hardened layer, the transition layer and the substrate with Vickers microhardness Distribution, to determine the depth of hardened layer. Measurement of surface hardness, due to plastic deformation of the range of about equal to the indentation depth of 10 times (some think it is indentation depth of 8 times), measuring